massive new collections checkin.

342 files changed, 8419 insertions, 21053 deletions

diff --git a/src/library/scala/Array.scala b/src/library/scala/Array.scala
index 45d12b433e..282885f0bb 100644
--- a/src/library/scala/Array.scala
+++ b/src/library/scala/Array.scala
@@ -11,8 +11,8 @@
 
 package scala
 
-
-import Predef._
+import scala.collection.generic._
+import scala.collection.mutable.{Vector, ArrayBuffer}
 import compat.Platform.arraycopy
 
 /** This object contains utility methods operating on arrays.
@@ -20,9 +20,15 @@ import compat.Platform.arraycopy
  *  @author Martin Odersky
  *  @version 1.0
  */
-object Array {
+object Array extends SequenceFactory[Array] {
+
   import runtime.BoxedArray;
   import scala.runtime.ScalaRunTime.boxArray;
+
+  type Coll = Array[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Array[A], Coll] = new BuilderFactory[A, Array[A], Coll] { def apply(from: Coll) = newBuilder[A] }
+  def newBuilder[A]: Builder[A, Array[A], Any] = new ArrayBuffer[A].mapResult(_.toArray)
+
   private def slowcopy(
                      src : AnyRef,
                   srcPos : Int,
@@ -76,46 +82,20 @@ object Array {
     result
   }
 
-  /** Create a an array containing of successive integers.
-   *
-   *  @param from the value of the first element of the array
-   *  @param end  the value of the last element fo the array plus 1
-   *  @return the sorted array of all integers in range [from;end).
-   */
-  def range(start: Int, end: Int): Array[Int] = {
-    val result = new Array[Int](end - start)
-    for (i <- start until end) result(i - start) = i
-    result
-  }
+  /** Returns array of length 0 */
+  override def empty[A]: Array[A] = new Array[A](0)
 
-  /** Create an array with given elements.
+ /** Create an array with given elements.
    *
    *  @param xs the elements to put in the array
    *  @return the array containing elements xs.
    */
-  def apply[A <: AnyRef](xs: A*): Array[A] = {
-    val array = new Array[A](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-
-/* The following metod clashes with the previous one, and has therefore been
- * removed. Note that this is a choice between efficiency and generality.
- * The previous factory method is more efficient than the one that has been
- * commented out. Since it is anyway possible to create a polymorphic array
- * using
- *        new Array[T]
- * it was preferred to restrict the definition of the factory method.
-
-   def Array[A](xs: A*): Array[A] = {
+  override def apply[A](xs: A*): Array[A] = {
     val array = new Array[A](xs.length)
     var i = 0
     for (x <- xs.elements) { array(i) = x; i += 1 }
     array
   }
-*/
 
   def apply(xs: Boolean*): Array[Boolean] = {
     val array = new Array[Boolean](xs.length)
@@ -180,13 +160,34 @@ object Array {
     array
   }
 
+  /** Create array with given dimensions */
+  def ofDim[A](n1: Int): Array[A] =
+    new Array[A](n1)
+  def ofDim[A](n1: Int, n2: Int): Array[Array[A]] =
+    tabulate(n1)(_ => ofDim[A](n2))
+  def ofDim[A](n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
+    tabulate(n1)(_ => ofDim[A](n2, n3))
+  def ofDim[A](n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
+    tabulate(n1)(_ => ofDim[A](n2, n3, n4))
+  def ofDim[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
+    tabulate(n1)(_ => ofDim[A](n2, n3, n4, n5))
+
+  /** Create array with given dimensions
+   * @deprecated   use ofDim instead */
+  @deprecated def withDims[A](n1: Int): Array[A] = ofDim(n1)
+  @deprecated def withDims[A](n1: Int, n2: Int): Array[Array[A]] = ofDim(n1, n2)
+  @deprecated def withDims[A](n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] = ofDim(n1, n2, n3)
+  @deprecated def withDims[A](n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] = ofDim(n1, n2, n3, n4)
+  @deprecated def withDims[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] = ofDim(n1, n2, n3, n4, n5)
+
   /** Create an array containing several copies of an element.
    *
    *  @param n    the length of the resulting array
    *  @param elem the element composing the resulting array
    *  @return     an array composed of n elements all equal to elem
+   *  @deprecated use `Array.fill` instead.
    */
-  def make[A](n: Int, elem: A): Array[A] = {
+  @deprecated def make[A](n: Int, elem: A): Array[A] = {
     val a = new Array[A](n)
     var i = 0
     while (i < n) {
@@ -198,8 +199,9 @@ object Array {
 
   /** Create an array containing the values of a given function <code>f</code>
    *  over given range <code>[0..n)</code>
+   *  @deprecated use `Array.tabulate` instead.
    */
-  def fromFunction[A](f: Int => A)(n: Int): Array[A] = {
+  @deprecated def fromFunction[A](f: Int => A)(n: Int): Array[A] = {
     val a = new Array[A](n)
     var i = 0
     while (i < n) {
@@ -211,95 +213,31 @@ object Array {
 
   /** Create an array containing the values of a given function <code>f</code>
    *  over given range <code>[0..n1, 0..n2)</code>
+   *  @deprecated use `Array.tabulate` instead.
    */
-  def fromFunction[A](f: (Int, Int) => A)(n1: Int, n2: Int): Array[Array[A]] =
+  @deprecated def fromFunction[A](f: (Int, Int) => A)(n1: Int, n2: Int): Array[Array[A]] =
     fromFunction(i => fromFunction(f(i, _))(n2))(n1)
 
   /** Create an array containing the values of a given function <code>f</code>
    *  over given range <code>[0..n1, 0..n2, 0..n3)</code>
+   *  @deprecated use `Array.tabulate` instead.
    */
-  def fromFunction[A](f: (Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
+  @deprecated def fromFunction[A](f: (Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
     fromFunction(i => fromFunction(f(i, _, _))(n2, n3))(n1)
 
   /** Create an array containing the values of a given function <code>f</code>
    *  over given range <code>[0..n1, 0..n2, 0..n3, 0..n4)</code>
+   *  @deprecated use `Array.tabulate` instead.
    */
-  def fromFunction[A](f: (Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
+  @deprecated def fromFunction[A](f: (Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
     fromFunction(i => fromFunction(f(i, _, _, _))(n2, n3, n4))(n1)
 
   /** Create an array containing the values of a given function <code>f</code>
    *  over given range <code>[0..n1, 0..n2, 0..n3, 0..n4, 0..n5)</code>
+   *  @deprecated use `Array.tabulate` instead.
    */
-  def fromFunction[A](f: (Int, Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
+  @deprecated def fromFunction[A](f: (Int, Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
     fromFunction(i => fromFunction(f(i, _, _, _, _))(n2, n3, n4, n5))(n1)
-
-  /** Create array with given dimensions */
-  def withDims[A](n1: Int): Array[A] =
-    new Array[A](n1)
-  def withDims[A](n1: Int, n2: Int): Array[Array[A]] =
-    fromFunction(_ => withDims[A](n2))(n1)
-  def withDims[A](n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
-    fromFunction(_ => withDims[A](n2, n3))(n1)
-  def withDims[A](n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
-    fromFunction(_ => withDims[A](n2, n3, n4))(n1)
-  def withDims[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
-    fromFunction(_ => withDims[A](n2, n3, n4, n5))(n1)
-
- /** This method is called as a result of a pattern match { case Array(...) => } or val Array(...) = ....
-   *
-   *  @param x the selector value
-   *  @return  array wrapped in an option
-   */
-   def unapplySeq[A](x: Array[A]): Option[Seq[A]] = Some(x)
-
-   trait ArrayLike[A] extends RandomAccessSeq.Mutable[A] {
-     def force : Array[A]
-   }
-
-   trait Projection[A] extends RandomAccessSeq.MutableProjection[A] with ArrayLike[A] {
-     protected def newArray[B >: A](length : Int, elements : Iterator[A]) : Array[B]
-     override def toArray[B >: A] = (newArray(length, elements))//:Any).asInstanceOf[Array[B]]
-     override def force : Array[A] = toArray
-     override def drop( from: Int) = slice(from, length)
-     override def take(until: Int) = slice(0, until)
-     override def dropWhile(p: A => Boolean) = {
-       val c = length + 1
-       drop((findIndexOf(!p(_)) + c) % c)
-     }
-     override def takeWhile(p: A => Boolean) = {
-       val c = length + 1
-       take((findIndexOf(!p(_)) + c) % c)
-     }
-     override def slice(from0: Int, until0: Int): Projection[A] = new RandomAccessSeq.MutableSlice[A] with Projection[A] {
-       override def from = from0
-       override def until = until0
-       override def underlying = Projection.this
-       override protected def newArray[B >: A](length: Int, elements: Iterator[A]) =
-         underlying.newArray(length, elements)
-       override def slice(from0: Int, until0: Int) =
-         Projection.this.slice(from + from0, from + until0)
-     }
-
-
-     override def reverse : Projection[A] = new Projection[A] {
-       override protected def newArray[B >: A](length : Int, elements : Iterator[A]) =
-         Projection.this.newArray(length, elements)
-       def update(idx : Int, what : A) : Unit = Projection.this.update(length - idx - 1, what)
-       def length = Projection.this.length
-       def apply(idx : Int) = Projection.this.apply(length - idx - 1)
-       override def stringPrefix = Projection.this.stringPrefix + "R"
-     }
-   }
-   trait Array0[A] extends RandomAccessSeq.Mutable[A] with ArrayLike[A] {
-     override def projection : Projection[A] = throw new Error
-     override def slice(from : Int, until : Int) : Projection[A] = projection.slice(from, until)
-     override def take(until : Int) : Projection[A] = projection.take(until)
-     override def drop(from : Int) : Projection[A] = projection.drop(from)
-     override def dropWhile(p: A => Boolean) = projection.dropWhile(p)
-     override def takeWhile(p: A => Boolean) = projection.takeWhile(p)
-     override def reverse = projection.reverse
-     override def force = asInstanceOf[Array[A]]
-   }
 }
 
 /** This class represents polymorphic arrays. <code>Array[T]</code> is Scala's representation
@@ -308,52 +246,63 @@ object Array {
  *  @author Martin Odersky
  *  @version 1.0
  */
-final class Array[A](_length: Int) extends Array.Array0[A] {
+final class Array[A](_length: Int) extends Vector[A] with VectorTemplate[A, Array[A]] {
+
+  override protected[this] def newBuilder: Builder[A, Array[A], Any] = throw new Error()
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead
+    */
+   @deprecated def this(dim1: Int, dim2: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int) = {
      this(dim1);
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int) = {
      this(dim1)
      throw new Error()
    }
 
-   /** Multidimensional array creation */
-   def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int, dim9: Int) = {
+   /** Multidimensional array creation
+    *  @deprecated use Array.ofDim instead */
+   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int, dim9: Int) = {
      this(dim1)
      throw new Error()
    }
@@ -396,66 +345,6 @@ final class Array[A](_length: Int) extends Array.Array0[A] {
    */
   override def update(i: Int, x: A) { throw new Error() }
 
-  /** An iterator returning the elements of this array, starting from 0.
-   */
-  override def elements: Iterator[A] = throw new Error()
-
-  /** @deprecated  use <code>slice(from,end).force</code> instead */
-  def subArray(from: Int, end: Int): Array[A] = throw new Error()
-
-  /** Returns an array consisting of all elements of this array that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *
-   *  @param p the predicate used to filter the array.
-   *  @return the elements of this array satisfying <code>p</code>.
-   */
-  override def filter(p: A => Boolean): Array[A] = throw new Error()
-
-  /** Returns an array consisting of all elements of this array followed
-   *  by all elements of the argument iterable.
-   */
-  override def ++[B >: A](that: Iterable[B]): Array[B] = throw new Error()
-
-  /** Returns the array resulting from applying the given function <code>f</code> to each
-   *  element of this array.
-   *
-   *  @param f function to apply to each element.
-   *  @return <code>[f(a0), ..., f(an)]</code> if this array is <code>[a0, ..., an]</code>.
-   */
-  override def map[B](f: A => B): Array[B] = throw new Error()
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this array, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this array is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  override def flatMap[B](f: A => Iterable[B]): Array[B] = throw new Error()
-
-  /** Returns an array formed from this array and the specified array
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two arrays is longer than the other, its remaining elements are ignored.
-   *
-   *  @return     <code>Array({a<sub>0</sub>,b<sub>0</sub>}, ...,
-   *              {a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>})</code> when
-   *              <code>Array(a<sub>0</sub>, ..., a<sub>m</sub>)
-   *              zip Array(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
-   */
-  def zip[B](that: Array[B]): Array[(A, B)] = throw new Error()
-
-  /** Returns an array that pairs each element of this array
-   *  with its index, counting from 0.
-   *
-   *  @return      the array <code>Array({a<sub>0</sub>,0}, {a<sub>1</sub>,1},...)</code>
-   *               where <code>a<sub>i</sub></code> are the elements of this stream.
-   */
-  def zipWithIndex: Array[(A, Int)] = throw new Error()
-
-  /** Returns an array that contains all indices of this array */
-  def indices: Array[Int] = throw new Error()
-
   /**
    *  @return a deep string representation of this array.
    */
@@ -510,4 +399,6 @@ final class Array[A](_length: Int) extends Array.Array0[A] {
    */
   def deepEquals(that: Any): Boolean = throw new Error()
 
+ /** @deprecated use slice instead */
+  @deprecated def subArray(from: Int, end: Int): Array[A] = throw new Error()
 }
diff --git a/src/library/scala/BufferedIterator.scala b/src/library/scala/BufferedIterator.scala
deleted file mode 100644
index 86f5f23967..0000000000
--- a/src/library/scala/BufferedIterator.scala
+++ /dev/null
@@ -1,194 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-
-import Predef._
-
-/** Buffered iterators are iterators which allow to inspect the next
- *  element without discarding it.
- *
- *  @author  Martin Odersky
- *  @author  SeanMcDirmid
- *  @version 2.0, 16/04/2007
- */
-trait BufferedIterator[+A] extends Iterator[A] {
-  /** Checks what the next available element is.
-    *
-    *  @return the current element
-    */
-  def head : A
-  def headOpt = if (!hasNext) None else Some(head)
-  override def buffered: this.type = this
-  /** iterates over and applies <code>f</code> to the next element
-   *  if this iterator has a next element that <code>f</code> is defined for.
-   */
-  def readIf[T](f : PartialFunction[A,T]) : Option[T] =
-    if (hasNext && f.isDefinedAt(head))
-      Some(f(next))
-    else None
-
-  /** iterates over elements as long as <code>f</code> is true
-   *  for each element, returns whether anything was read
-   */
-  def readWhile(f : A => Boolean) : Boolean = {
-    var read = false
-    while (hasNext && f(head)) {
-      next
-      read = true
-    }
-    read
-  }
-  def advanced : BufferedIterator.Advanced[A] = new BufferedIterator.Default[A] {
-    protected def fill(sz : Int) : Seq[A] = if (BufferedIterator.this.hasNext) (BufferedIterator.this.next) :: Nil else Nil
-  }
-}
-
-object BufferedIterator {
-  import collection.mutable.{Buffer, ListBuffer}
-
-  trait Advanced[+A] extends BufferedIterator[A] {
-    /** returns the first <code>sz</code> elements that will be iterated by this iterator,
-     *  or fewer if the iterator has less elements left to iterate over
-     */
-    def peekList(sz : Int) : Seq[A]
-
-    /** Checks what the next available element is.
-     *
-     *  @return the current element
-     */
-    def head: A = peek(0)
-
-    /** return the <code>n</code>th element that will be iterated by this iterator */
-    def peek(n : Int) : A = {
-      val lst = peekList(n + 1);
-      if (n == 0) {
-        return if (lst.isEmpty) defaultPeek
-               else lst(0)
-      }
-
-      val i = lst.elements
-      var m = 0
-      while (m < n && i.hasNext) {
-        i.next; m += 1
-      }
-      if (!i.hasNext) defaultPeek
-      else i.next
-    }
-    /** element returned when no element left to iterate over;
-     *  throws <code>NoSuchElementException</code> by default
-     */
-    protected def defaultPeek : A = throw new Predef.NoSuchElementException
-
-    /** true if elements of <code>seq</code> will be iterated over next in this iterator
-     */
-    def startsWith(seq : Seq[Any]) : Boolean = {
-      var sz = seq.length
-      val j = peekList(sz).elements
-      val i = seq.elements
-      while (i.hasNext && j.hasNext)
-        if (i.next != j.next) return false
-      return !i.hasNext
-    }
-    def readIfStartsWith(seq : Seq[Any]) : Boolean = {
-      if (startsWith(seq)) {
-        var i = 0
-        while (i < seq.length) {
-          next; i = i + 1
-        }
-        true
-      } else false
-    }
-    override def counted : CountedIterator[A] with Advanced[A] = new CountedIterator[A] with Advanced[A] {
-      private var cnt = -1
-      def count = cnt
-      override def hasNext: Boolean = Advanced.this.hasNext
-      override def next: A = { cnt += 1; Advanced.this.next }
-      override def peekList(sz : Int) : Seq[A] = Advanced.this.peekList(sz)
-      override protected def defaultPeek : A = Advanced.this.defaultPeek
-      override def counted : this.type = this
-    }
-    override def hasNext = !peekList(1).isEmpty
-    override def toString = {
-      val list = peekList(0)
-      if (!list.isEmpty) "peek " + list else "***"
-    }
-
-    override def advanced : this.type = this
-  }
-
-  trait PutBack[+A] extends Advanced[A] {
-    protected[this] def putBack(a : A) : Unit
-    override def counted : CountedIterator[A] with PutBack[A] = new CountedIterator[A] with PutBack[A] {
-      private var cnt = -1
-      def count = cnt
-      override protected def defaultPeek : A = PutBack.this.defaultPeek
-      override def next: A = { cnt += 1; PutBack.this.next }
-      override def hasNext: Boolean = PutBack.this.hasNext
-      override def peekList(sz : Int) : Seq[A] = PutBack.this.peekList(sz)
-      override protected[this] def putBack(a : A) : Unit = {
-        if (cnt <= 0) throw new IllegalArgumentException
-        PutBack.this.putBack(a)
-        cnt = cnt - 1
-      }
-      override def counted : this.type = this
-    }
-    protected[this] def flushFrom[B <% Seq[A]](i : Default[B]) =
-      i.forget.reverse.foreach(_.reverse.foreach(putBack))
-  }
-
-
-  abstract class Default[+A] extends PutBack[A] {
-    import scala.collection.mutable.ListBuffer
-    private[this] val lookahead = new ListBuffer[A]  // = Nil
-    override protected[this] def putBack(a : A) : Unit = a +: lookahead
-    override protected def defaultPeek : A = throw new Predef.NoSuchElementException
-    override def hasNext = !lookahead.isEmpty || super.hasNext
-
-    /** used to fill lookahead buffer. <code>sz</code> can be used by implementations as a heauristic to determine how many elements are desired */
-    protected def fill(sz : Int) : Seq[A]
-
-    private[BufferedIterator] def forget : List[A] = {
-      val ret = lookahead.toList
-      lookahead.clear
-      ret
-    }
-
-    override def peekList(sz : Int) : Seq[A] = {
-      if (sz == 0) return lookahead.readOnly
-      else if (sz == 1) {
-        if (!lookahead.isEmpty) return lookahead.readOnly
-        fill(sz) match {
-        case Seq.singleton(x) => lookahead += x
-        case next => lookahead ++= next
-        }
-        return lookahead.readOnly
-      }
-      var sz0 = lookahead.length
-      while (sz0 < sz) {
-        val next = fill(sz - sz0)
-        if (next.isEmpty) return lookahead.readOnly
-        sz0 += next.length
-        lookahead ++= next
-      }
-      lookahead.readOnly
-    }
-    override def next : A = {
-      val lst = peekList(1)
-      if (lst.isEmpty) throw new Predef.NoSuchElementException
-      lookahead.remove(0)
-      lst(0)
-    }
-  }
-}
-
-
diff --git a/src/library/scala/Collection.scala b/src/library/scala/Collection.scala
deleted file mode 100644
index 21c8dc060a..0000000000
--- a/src/library/scala/Collection.scala
+++ /dev/null
@@ -1,47 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-
-import Predef._
-
-/** Variant of <code>Iterable</code> used to describe
- *  collections with a finite number of elements.
- *  Basically, this trait just adds size and toString to Iterable,
- *  as most of the methods in Iterable already assume finite-ness.
- *
- *  @author Sean McDirmid
- */
-trait Collection[+A] extends Iterable[A] {
-  /** Returns the number of elements in this collection.
-    *
-    *  @return number of collection elements.
-    */
-  def size : Int
-  /** Converts this iterable to a fresh Array with elements.
-    */
-  def toArray[B >: A]: Array[B] = toList.toArray
-
-  override def toString = mkString(stringPrefix + "(", ", ", ")")
-
-  /** Defines the prefix of this object's <code>toString</code> representation.
-   */
-  protected def stringPrefix : String = {
-    var string = this.getClass.getName
-    val idx1 = string.lastIndexOf('.' : Int)
-    if (idx1 != -1) string = string.substring(idx1 + 1)
-    val idx2 = string.indexOf('$')
-    if (idx2 != -1) string = string.substring(0, idx2)
-    string
-  }
-}
-
diff --git a/src/library/scala/CollectionProxy.scala b/src/library/scala/CollectionProxy.scala
deleted file mode 100644
index fae285d3dd..0000000000
--- a/src/library/scala/CollectionProxy.scala
+++ /dev/null
@@ -1,55 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import scala.collection.mutable.Buffer
-
-
-/** This class implements a proxy for iterable objects. It forwards
- *  all calls to a different iterable object.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-trait CollectionProxy[+A] extends Collection[A] with IterableProxy[A] {
-
-  def self: Collection[A]
-  override def size = self.size
-  override def toArray[B >: A] : Array[B] = self.toArray
-/*
-  override def elements: Iterator[A] = self.elements
-  override def map[B](f: A => B): Collection[B] = self map f
-  override def flatMap[B](f: A => Collection[B]): Collection[B] = self flatMap f
-  override def filter(p: A => Boolean): Collection[A] = self filter p
-  override def takeWhile(p: A => Boolean): Collection[A] = self takeWhile p
-  override def dropWhile(p: A => Boolean): Collection[A] = self dropWhile p
-  override def drop(n: Int): Collection[A] = self drop n
-  override def foreach(f: A => Unit): Unit = self foreach f
-  override def forall(p: A => Boolean): Boolean = self forall p
-  override def exists(p: A => Boolean): Boolean = self exists p
-  override def find(p: A => Boolean): Option[A] = self find p
-  override def findIndexOf(p: A => Boolean): Int = self findIndexOf p
-  override def indexOf[B >: A](elem: B): Int = self indexOf elem
-  override def foldLeft[B](z: B)(op: (B, A) => B): B = (self foldLeft z)(op)
-  override def foldRight[B](z: B)(op: (A, B) => B): B = (self foldRight z)(op)
-  override def /:[B](z: B)(op: (B, A) => B): B = (z /: self)(op)
-  override def :\[B](z: B)(op: (A, B) => B): B = (self :\ z)(op)
-  override def reduceLeft[B >: A](op: (B, B) => B): B = self reduceLeft op
-  override def reduceRight[B >: A](op: (B, B) => B): B = self reduceRight op
-  override def sameElements[B >: A](that: Iterable[B]): Boolean = self sameElements that
-  override def copyToBuffer[B >: A](dest: Buffer[B]): Unit = self copyToBuffer dest
-  override def toList: List[A] = self.toList
-  override def mkString(start: String, sep: String, end: String): String = self.mkString(start, sep, end)
-  override def addString(buf: StringBuilder, start: String, sep: String, end: String): StringBuilder = self.addString(buf, start, sep, end)
-  */
-}
diff --git a/src/library/scala/CountedIterator.scala b/src/library/scala/CountedIterator.scala
index 0734e1111f..490743d733 100644
--- a/src/library/scala/CountedIterator.scala
+++ b/src/library/scala/CountedIterator.scala
@@ -12,20 +12,12 @@
 package scala
 
 /** Counted iterators keep track of the number of elements seen so far
- *
- *  @author  Martin Odersky
- *  @version 1.0, 16/07/2003
+ *  @deprecated  use iterator.zipWithIndex instead
  */
-trait CountedIterator[+A] extends Iterator[A] {
+@deprecated trait CountedIterator[+A] extends Iterator[A] {
   /** counts the elements in this iterator; counts start at 0
    */
   def count: Int
 
   override def counted : this.type = this
-  override def buffered: BufferedIterator[A] with CountedIterator[A] = new BufferedIterator.Default[A] with CountedIterator[A] {
-    protected def fill(sz : Int) = if (CountedIterator.this.hasNext) (CountedIterator.this.next) :: Nil else Nil
-    override def count = CountedIterator.this.count - peekList(0).length
-    override def counted : this.type = this
-    override def buffered : this.type = this
-  }
 }
diff --git a/src/library/scala/Enumeration.scala b/src/library/scala/Enumeration.scala
index 577d58ca53..6a9e1331b1 100644
--- a/src/library/scala/Enumeration.scala
+++ b/src/library/scala/Enumeration.scala
@@ -13,6 +13,8 @@ package scala
 
 
 import scala.collection.mutable.{Map, HashMap}
+import scala.collection.immutable.{Set, BitSet}
+import scala.collection.generic.{Builder, BuilderFactory, AddingBuilder, SetTemplate}
 
 /** <p>
  *    Defines a finite set of values specific to the enumeration. Typically
@@ -59,8 +61,9 @@ abstract class Enumeration(initial: Int, names: String*) {
   def this() = this(0, null)
   def this(names: String*) = this(0, names: _*)
 
-  /** The name of this enumeration.  */
-  protected def name = {
+  /** The name of this enumeration.
+   */
+  override def toString = {
     val cname = this.getClass().getName()
     if (cname endsWith "$")
       cname.substring(0, cname.length() - 1)
@@ -72,10 +75,21 @@ abstract class Enumeration(initial: Int, names: String*) {
 
   /** The mapping from the integer used to identifying values to the actual
     * values. */
-  private val values: Map[Int, Value] = new HashMap
+  private val vmap: Map[Int, Value] = new HashMap
 
   /** The cache listing all values of this enumeration. */
-  lazy private val vcache: List[Value] = values.values.toList.sort(_.id < _.id)
+  @transient private var vset: ValueSet = null
+  @transient private var vsetDefined = false
+
+  /** The values of this enumeration as a set.
+   */
+  def values: ValueSet = {
+    if (!vsetDefined) {
+      vset = new ValueSet(BitSet.empty ++ (vmap.values map (_.id)))
+      vsetDefined = true
+    }
+    vset
+  }
 
   /** The integer to use to identify the next created value. */
   protected var nextId = initial
@@ -89,15 +103,11 @@ abstract class Enumeration(initial: Int, names: String*) {
 
   /** The highest integer amongst those used to identify values in this
     * enumeration. */
-  protected final def maxId = topId
-
-  /** The value in this enumeration identified by integer <code>x</code>. */
-  final def apply(x: Int): Value = values(x)
-
-  /** A new iterator over all values of this enumeration. */
-  final def elements: Iterator[Value] = vcache.elements
+  final def maxId = topId
 
-  override def toString(): String = vcache.mkString("{", ", ", "}")
+  /** The value of this enumeration with given id `x`
+   */
+  final def withId(x: Int): Value = vmap(x)
 
   /** Returns a Value from this Enumeration whose name matches
    * the argument <var>s</var>.
@@ -108,7 +118,7 @@ abstract class Enumeration(initial: Int, names: String*) {
    * @return <tt>Some(Value)</tt> if an enumeration's name matches <var>s</var>,
    * else <tt>None</tt>
    */
-  def valueOf(s: String) = elements find (_.toString == s)
+  def withName(s: String): Value = values.find(_.toString == s).get
 
   /** Creates a fresh value, part of this enumeration. */
   protected final def Value: Value = Value(nextId)
@@ -152,17 +162,20 @@ abstract class Enumeration(initial: Int, names: String*) {
         case _ => false
       }
     override def hashCode: Int = id.hashCode
+
     /** this enumeration value as an <code>Int</code> bit mask.
      *  @throws IllegalArgumentException if <code>id</code> is greater than 31
+     *  @deprecated
      */
-    def mask32: Int = {
+    @deprecated def mask32: Int = {
       if (id >= 32) throw new IllegalArgumentException
       1  << id
     }
     /** this enumeration value as an <code>Long</code> bit mask.
      *  @throws IllegalArgumentException if <code>id</code> is greater than 63
+     *  @deprecated
      */
-    def mask64: Long = {
+    @deprecated def mask64: Long = {
       if (id >= 64) throw new IllegalArgumentException
       1L << id
     }
@@ -181,19 +194,49 @@ abstract class Enumeration(initial: Int, names: String*) {
     def this(name: String) = this(nextId, name)
     def this() =
       this(nextId, if (nextName.hasNext) nextName.next else nextId.toString())
-    assert(!values.isDefinedAt(i))
-    values(i) = this
+    assert(!vmap.isDefinedAt(i))
+    vmap(i) = this
+    vsetDefined = false
     nextId = i + 1
     if (nextId > topId) topId = nextId
     def id = i
     override def toString() =
-      if (name eq null) Enumeration.this.name + "(" + i + ")"
+      if (name eq null) Enumeration.this + "(" + i + ")"
       else name
     private def readResolve(): AnyRef =
-      if (values ne null) values(i)
+      if (vmap ne null) vmap(i)
       else this
   }
 
+  /** A class for sets of values
+   *  Iterating through this set will yield values in increasing order of their ids.
+   *  @param   ids   The set of ids of values, organized as a BitSet.
+   */
+  class ValueSet private[Enumeration] (val ids: BitSet) extends Set[Value] with SetTemplate[Value, ValueSet] {
+    override def empty = ValueSet.empty
+    def contains(v: Value) = ids contains (v.id)
+    def + (value: Value) = new ValueSet(ids + value.id)
+    def - (value: Value) = new ValueSet(ids - value.id)
+    def elements = ids.elements map withId
+    override def stringPrefix = Enumeration.this + ".ValueSet"
+  }
+
+  /** A factory object for value sets */
+  object ValueSet {
+    /** The empty value set */
+    val empty = new ValueSet(BitSet.empty)
+    /** A value set consisting of given elements */
+    def apply(elems: Value*): ValueSet = {
+      var s = empty
+      for (elem <- elems) s = s + elem // !!! change to s += elem --> error
+      s
+    }
+    /** A builder object for value sets */
+    def newBuilder: Builder[Value, ValueSet, Any] = new AddingBuilder(empty)
+    /** The implicit builder for value sets */
+    implicit def builderFactory: BuilderFactory[Value, ValueSet, ValueSet] = new BuilderFactory[Value, ValueSet, ValueSet] { def apply(from: ValueSet) = newBuilder }
+  }
+
   /** A set that efficiently stores enumeration values as bits.
    *
    *  @author Sean McDirmid
@@ -218,8 +261,9 @@ abstract class Enumeration(initial: Int, names: String*) {
    *  <b>if</b> (e.flags.contains(flags.Private))
    *    e.flags0 = (e.flags | flags.Final).underlying;
    *  </pre>
+   *  @deprecated  use ValueSet instead
    */
-  protected abstract class SetXX extends collection.immutable.Set[Value] {
+  @deprecated abstract class SetXX extends collection.immutable.Set[Value] {
 
     /** either Int or Long */
     type Underlying <: AnyVal
@@ -255,7 +299,7 @@ abstract class Enumeration(initial: Int, names: String*) {
     def +(value: Value): TSet = this | value
     def ++(set: TSet): TSet = this | set
     def **(set: TSet): TSet = this & set
-    def size = {
+    override def size = {
       var x = underlyingAsLong
       var sz = 0
       while (x != 0) {
@@ -276,23 +320,23 @@ abstract class Enumeration(initial: Int, names: String*) {
       def next = {
         if (underlying == 0) throw new NoSuchElementException
         while ((underlying & 1) == 0) shift
-        val ret = values(bit)
+        val ret = vmap(bit)
         shift
         ret
       }
     }
-    def empty[B]: scala.collection.immutable.Set[B] = new scala.collection.immutable.HashSet[B];
   }
 
   /** An enumeration bit set that can handle enumeration values with ids up
    *  to 31 in an <code>Int</code>.
+   *  @deprecated  use ValueSet instead
    */
-  protected class Set32(val underlying: Int) extends SetXX {
+  @deprecated class Set32(val underlying: Int) extends SetXX {
     def this() = this(0)
     type Underlying = Int
     type TSet = Set32
     def underlyingAsLong = {
-      if (underlying >= 0) underlying.toLong
+       if (underlying >= 0) underlying.toLong
       else {
         val underlying0 = (~(1 << 31)) & underlying
         assert(underlying0 >= 0)
@@ -314,8 +358,9 @@ abstract class Enumeration(initial: Int, names: String*) {
 
   /** An enumeration bit set that can handle enumeration values with ids up
    *  to 63 in a <code>Long</code>.
+   *  @deprecated  use ValueSet instead
    */
-  protected class Set64(val underlying: Long) extends SetXX {
+  @deprecated class Set64(val underlying: Long) extends SetXX {
     def this() = this(0)
     type Underlying = Long
     type TSet = Set64
@@ -345,4 +390,58 @@ abstract class Enumeration(initial: Int, names: String*) {
     assert(m == 1)
     bit
   }
+
+  /** The name of this enumeration.
+   *  @deprecated  use toString instead
+   */
+  @deprecated def name = toString
+
+  /** The value in this enumeration identified by integer <code>x</code>.
+   *  @deprecated use withId instead.
+   */
+  @deprecated final def apply(x: Int): Value = withId(x)
+
+  /** @deprecated use withName instead
+   */
+  @deprecated def valueOf(s: String) = values.find(_.toString == s)
+
+  /** A new iterator over all values of this enumeration.
+   *  @deprecated use values.elements instead
+   */
+  @deprecated final def elements: Iterator[Value] = values.elements
+
+  /** Apply a function f to all values of this enumeration.
+   *  @deprecated use values.foreach instead
+   */
+  @deprecated def foreach(f: Value => Unit): Unit = elements foreach f
+
+  /** Apply a predicate p to all values of this enumeration and return
+    * true, iff the predicate yields true for all values.
+   *  @deprecated use values.forall instead
+   */
+  @deprecated def forall(p: Value => Boolean): Boolean = elements forall p
+
+  /** Apply a predicate p to all values of this enumeration and return
+    * true, iff there is at least one value for which p yields true.
+    *  @deprecated use values.exists instead
+    */
+  @deprecated def exists(p: Value => Boolean): Boolean = elements exists p
+
+  /** Returns an iterator resulting from applying the given function f to each
+    * value of this enumeration.
+    *  @deprecated use values.map instead
+    */
+  @deprecated def map[B](f: Value => B): Iterator[B] = elements map f
+
+  /** Applies the given function f to each value of this enumeration, then
+    * concatenates the results.
+    *  @deprecated use values.flatMap instead
+    */
+  @deprecated def flatMap[B](f: Value => Iterator[B]): Iterator[B] = elements flatMap f
+
+  /** Returns all values of this enumeration that satisfy the predicate p.
+    * The order of values is preserved.
+    *  @deprecated use values.filter instead
+    */
+  @deprecated def filter(p: Value => Boolean): Iterator[Value] = elements filter p
 }
diff --git a/src/library/scalax/Fractional.scala b/src/library/scala/Fractional.scala
index b29a903519..81366a80b9 100755
--- a/src/library/scalax/Fractional.scala
+++ b/src/library/scala/Fractional.scala
@@ -1,4 +1,4 @@
-package scalax
+package scala
 
 trait Fractional[T] extends Numeric[T] {
   def div(x: T, y: T): T
diff --git a/src/library/scalax/collection/mutable/DefaultEntry.scala b/src/library/scala/Immutable.scala
index 2fb0f62226..5e9fff003a 100644..100755
--- a/src/library/scalax/collection/mutable/DefaultEntry.scala
+++ b/src/library/scala/Immutable.scala
@@ -5,12 +5,8 @@
 ** /____/\___/_/ |_/____/_/ | |                                         **
 **                          |/                                          **
 \*                                                                      */
+package scala
 
-// $Id: DefaultEntry.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.mutable
-
-@serializable
-final class DefaultEntry[A, B](val key: A, var value: B)
-      extends HashEntry[A, DefaultEntry[A, B]]
+/** A marker trait for all immutable datastructures such as imutable collections
+ */
+trait Immutable
diff --git a/src/library/scalax/Integral.scala b/src/library/scala/Integral.scala
index 2e80b1bb7b..bfd4bf9f48 100755
--- a/src/library/scalax/Integral.scala
+++ b/src/library/scala/Integral.scala
@@ -1,4 +1,4 @@
-package scalax
+package scala
 
 trait Integral[T] extends Numeric[T] {
   def quot(x: T, y: T): T
diff --git a/src/library/scala/Iterable.scala b/src/library/scala/Iterable.scala
deleted file mode 100644
index a09d23863a..0000000000
--- a/src/library/scala/Iterable.scala
+++ /dev/null
@@ -1,512 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-
-import Predef._
-import collection.mutable.{Buffer,ArrayBuffer}
-
-/** Various utilities for instances of <a href="Iterable.html">Iterable</a>.
- *
- *  @author  Matthias Zenger
- *  @version 1.1, 04/02/2004
- */
-object Iterable {
-/*
-  implicit def view[A <% Ordered[A]](x: Iterable[A]): Ordered[Iterable[A]] =
-    new Ordered[Iterable[A]] {
-      def compare[B >: Iterable[A] <% Ordered[B]](that: B): Int = that match {
-        case y: Iterable[A] =>
-          val xs = x.elements
-          val ys = y.elements
-          var res = 0
-          while (xs.hasNext && ys.hasNext && (res == 0)) {
-            res = xs.next compare ys.next
-          }
-          if (xs.hasNext) 1
-          else if (ys.hasNext) -1
-          else res
-        case _ =>
-          -(that compare x)
-      }
-    }
-*/
-  /** The minimum element of a non-empty sequence of ordered elements */
-  def min[A <% Ordered[A]](seq: Iterable[A]): A = {
-    val xs = seq.elements
-    if (!xs.hasNext) throw new IllegalArgumentException("min(<empty>)")
-    var min = xs.next
-    while (xs.hasNext) {
-      val x = xs.next
-      if (x < min) min = x
-    }
-    min
-  }
-
-  /** The maximum element of a non-empty sequence of ordered elements */
-  def max[A <% Ordered[A]](seq: Iterable[A]): A = {
-    val xs = seq.elements
-    if (!xs.hasNext) throw new IllegalArgumentException("max(<empty>)")
-    var max = xs.next
-    while (xs.hasNext) {
-      val x = xs.next
-      if (max < x) max = x
-    }
-    max
-  }
-
-  /** The empty iterable object */
-  val empty = new Iterable[Nothing] {
-    def elements = Iterator.empty
-  }
-  /** A non-strict projection of an iterable.
-   * @author Sean McDirmid
-   */
-  trait Projection[+A] extends Iterable[A] {
-    override def projection = this
-    /** convert to a copied strict collection */
-    def force : Iterable[A] = toList
-
-    /** non-strict */
-    override def filter(p : A => Boolean) : Projection[A] = new Projection[A] {
-      def elements = Projection.this.elements.filter(p)
-    }
-    /** non-strict */
-    override def map[B](f: A => B) : Projection[B] = new Projection[B] {
-      def elements = Projection.this.elements.map(f)
-    }
-    /** non-strict */
-    override def flatMap[B](f: A => Iterable[B]) : Projection[B] = new Projection[B] {
-      def elements = Projection.this.elements.flatMap(a => f(a).elements)
-    }
-    /** non-strict */
-    override def takeWhile(p: A => Boolean): Projection[A] = new Projection[A] {
-      def elements = Projection.this.elements.takeWhile(p)
-    }
-    /** The projection resulting from the concatenation of this projection with the <code>rest</code> projection.
-     *  @param rest   The projection that gets appended to this projection
-     */
-    def append[B >: A](rest : => Iterable[B]): Projection[B] = new Projection[B] {
-      def elements = Projection.this.elements ++ rest.elements
-    }
-  }
-}
-
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>Collection</code>.
- *        Only potentially unbounded collections should directly sub-class <code>Iterable</code>.
- *  @author  Matthias Zenger
- *  @version 1.1, 04/02/2004
- */
-trait Iterable[+A] {
-
-  /** Creates a new iterator over all elements contained in this
-   *  object.
-   *
-   *  @return the new iterator
-   */
-  def elements: Iterator[A]
-
-  /** Appends two iterable objects.
-   *
-   *  @return the new iterable object
-   *  @deprecated  use <code>++</code> instead
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  @deprecated
-  def concat[B >: A](that: Iterable[B]): Collection[B] =
-    this ++ that
-
-  /** Appends two iterable objects.
-   *
-   *  @return the new iterable object
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def ++ [B >: A](that: Iterable[B]): Collection[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf
-  }
-
-  /** Returns the iterable resulting from applying the given function
-   *  <code>f</code> to each element of this iterable.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param f function to apply to each element.
-   *  @return <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code>
-   *          if this iterable is <code>a<sub>0</sub>, ..., an</code>.
-   */
-  def map[B](f: A => B): Iterable[B] = {
-    val buf = new ArrayBuffer[B]
-    val elems = elements
-    while (elems.hasNext) buf += f(elems.next)
-    buf
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this iterable, then concatenates the results.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this iterable is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  def flatMap[B](f: A => Iterable[B]): Iterable[B] = {
-    val buf = new ArrayBuffer[B]
-    val elems = elements
-    while (elems.hasNext) f(elems.next) copyToBuffer buf
-    buf
-  }
-
-  /** Returns all the elements of this iterable that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param p the predicate used to filter the list.
-   *  @return the elements of this list satisfying <code>p</code>.
-   */
-  def filter(p: A => Boolean): Iterable[A] = {
-    val buf = new ArrayBuffer[A]
-    val elems = elements
-    while (elems.hasNext) { val x = elems.next; if (p(x)) buf += x }
-    buf
-  }
-
-  /** Partitions this iterable in two iterables according to a predicate.
-   *
-   *  @param p the predicate on which to partition
-   *  @return  a pair of iterables: the iterable that satisfy the predicate
-   *           <code>p</code> and the iterable that do not.
-   *           The relative order of the elements in the resulting iterables
-   *           is the same as in the original iterable.
-   */
-  def partition(p: A => Boolean): (Iterable[A], Iterable[A]) = {
-    val matched = new ArrayBuffer[A]
-    val failed = new ArrayBuffer[A]
-    val elems = elements
-    while (elems.hasNext) { val x = elems.next; if (p(x)) matched += x else failed += x }
-    (matched, failed)
-  }
-
-  /** Returns the longest prefix of this iterable whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param p the test predicate.
-   *  @return  the longest prefix of this iterable whose elements satisfy
-   *           the predicate <code>p</code>.
-   */
-  def takeWhile(p: A => Boolean): Iterable[A] =
-    (new ArrayBuffer[A] ++ elements.takeWhile(p))
-
-  /** Returns the longest suffix of this iterable whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param p the test predicate.
-   *  @return  the longest suffix of the iterable whose first element
-   *           does not satisfy the predicate <code>p</code>.
-   */
-  def dropWhile(p: A => Boolean): Collection[A] =
-    (new ArrayBuffer[A] ++ elements.dropWhile(p))
-
-  /** Returns an iterable consisting only over the first <code>n</code>
-   *  elements of this iterable, or else the whole iterable, if it has less
-   *  than <code>n</code> elements.
-   *
-   *  @deprecated API does not make sense for non-ordered collections
-   *  @param n the number of elements to take
-   *  @return  the new iterable
-   */
-  @deprecated def take(n: Int): Collection[A] =
-    (new ArrayBuffer[A] ++ elements.take(n))
-
-  /** Returns this iterable without its <code>n</code> first elements
-   *  If this iterable has less than <code>n</code> elements, the empty
-   *  iterable is returned.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @deprecated API does not make sense for non-ordered collections
-   *  @param n the number of elements to drop
-   *  @return  the new iterable
-   */
-  @deprecated def drop(n: Int): Collection[A] =
-    (new ArrayBuffer[A] ++ elements.drop(n))
-
-  /** Apply a function <code>f</code> to all elements of this
-   *  iterable object.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  f   a function that is applied to every element.
-   */
-  def foreach(f: A => Unit): Unit = elements.foreach(f)
-
-  /** Apply a predicate <code>p</code> to all elements of this
-   *  iterable object and return true, iff the predicate yields
-   *  true for all elements.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   *  @return true, iff the predicate yields true for all elements.
-   */
-  def forall(p: A => Boolean): Boolean = elements.forall(p)
-
-  /** Apply a predicate <code>p</code> to all elements of this
-   *  iterable object and return true, iff there is at least one
-   *  element for which <code>p</code> yields true.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   *  @return true, iff the predicate yields true for at least one element.
-   */
-  def exists(p: A => Boolean): Boolean = elements.exists(p)
-
-  /** Find and return the first element of the iterable object satisfying a
-   *  predicate, if any.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param p the predicate
-   *  @return the first element in the iterable object satisfying <code>p</code>,
-   *  or <code>None</code> if none exists.
-   */
-  def find(p: A => Boolean): Option[A] = elements.find(p)
-
-  /** Returns index of the first element satisying a predicate, or -1.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @return   the index of the first element satisfying <code>p</code>,
-   *            or -1 if such an element does not exist
-   *  @deprecated  Method is pushed to <code>Seq</code>, will be removed from <code>Iterable</code>.
-   */
-  @deprecated def findIndexOf(p: A => Boolean): Int =
-    elements.findIndexOf(p)
-
-  /** Returns the index of the first occurence of the specified
-   *  object in this iterable object.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  elem  element to search for.
-   *  @return the index in this sequence of the first occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   *  @deprecated  Method is pushed to <code>Seq</code>, will be removed from <code>Iterable</code>.
-   */
-  @deprecated def indexOf[B >: A](elem: B): Int =
-    elements.indexOf(elem)
-
-  /** Combines the elements of this iterable object together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the list is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  def foldLeft[B](z: B)(op: (B, A) => B): B = elements.foldLeft(z)(op)
-
-  /** Combines the elements of this list together using the binary
-   *  function <code>f</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the list is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  def foldRight[B](z: B)(op: (A, B) => B): B = elements.foldRight(z)(op)
-
-  /** Similar to <code>foldLeft</code> but can be used as
-   *  an operator with the order of list and zero arguments reversed.
-   *  That is, <code>z /: xs</code> is the same as <code>xs foldLeft z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def /:[B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
-
-  /** An alias for <code>foldRight</code>.
-   *  That is, <code>xs :\ z</code> is the same as <code>xs foldRight z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def :\[B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the iterable object has elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the iterable object is empty.
-   */
-  def reduceLeft[B >: A](op: (B, A) => B): B = elements.reduceLeft(op)
-
-/** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   *
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  def reduceRight[B >: A](op: (A, B) => B): B = elements.reduceRight(op)
-
-  /** Copy all elements to a given buffer
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  dest   The buffer to which elements are copied
-   *  @note Will not terminate if not finite.
-   */
-  def copyToBuffer[B >: A](dest: Buffer[B]): Unit = elements copyToBuffer dest
-
-  /** Checks if the other iterable object contains the same elements.
-   *
-   *  @note will not terminate for infinite-sized collections.
-   *  @param that  the other iterable object
-   *  @return true, iff both iterable objects contain the same elements in the same order.
-   */
-  def sameElements[B >: A](that: Iterable[B]): Boolean = {
-    val ita = this.elements
-    val itb = that.elements
-    var res = true
-    while (res && ita.hasNext && itb.hasNext) {
-      res = (ita.next == itb.next)
-    }
-    !ita.hasNext && !itb.hasNext && res
-  }
-
-  /**
-   *  Returns a list containing all of the elements in this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toList: List[A] = elements.toList
-
-  /**
-   *  Returns a sequence containing all of the elements in this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toSeq: Seq[A] = toList
-
-  /**
-   *  Returns a stream containing all of the elements in this iterable object.
-   *  @note consider using <code>projection</code> for lazy behavior.
-   */
-  def toStream: Stream[A] = Stream.fromIterator(elements)
-
-  /** Returns a string representation of this iterable object. The resulting string
-   *  begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   *
-   *  @ex  <code>List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"</code>
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(start: String, sep: String, end: String): String = {
-    val buf = new StringBuilder()
-    addString(buf, start, sep, end).toString
-  }
-
-  /** Returns a string representation of this iterable object. The string
-   *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param sep separator string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(sep: String): String = this.mkString("", sep, "")
-
-  /** Converts a collection into a flat <code>String</code> by each element's toString method.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def mkString: String = mkString("")
-
-  /** Write all elements of this string into given string builder.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param buf the StringBuilder to which elements are appended
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return the <code>buf</code> StringBuilder object
-   */
-  def addString(buf: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
-    buf.append(start)
-    val elems = elements
-    if (elems.hasNext) buf.append(elems.next)
-    while (elems.hasNext) {
-      buf.append(sep); buf.append(elems.next)
-    }
-    buf.append(end)
-  }
-
-  /** Write all elements of this string into given string builder.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param buf the StringBuilder to which elements are appended
-   *  @param sep separator string.
-   *  @return the <code>buf</code> StringBuilder object
-   */
-  def addString(buf: StringBuilder, sep: String): StringBuilder = addString(buf, "", sep, "")
-
-  /** Write all elements of this string into given string builder, with no separator string
-   *  between elements.
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param buf the StringBuilder to which elements are appended
-   *  @return the <code>buf</code> StringBuilder object
-   */
-  def addString(buf: StringBuilder): StringBuilder = addString(buf, "", "", "")
-
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int): Unit =
-    elements.copyToArray(xs, start)
-
-
-  /** Is this collection empty? */
-  def isEmpty = !elements.hasNext
-
-  /**
-   * returns a projection that can be used to call non-strict <code>filter</code>,
-   * <code>map</code>, and <code>flatMap</code> methods that build projections
-   * of the collection.
-   */
-  def projection : Iterable.Projection[A] = new Iterable.Projection[A] {
-    def elements = Iterable.this.elements
-    override def force = Iterable.this
-  }
-
-  /** returns true iff this collection has a bound size.
-   *  Many APIs in this trait will not work on collections of
-   *  unbound sizes.
-   */
-  def hasDefiniteSize = true
-
-}
diff --git a/src/library/scala/IterableProxy.scala b/src/library/scala/IterableProxy.scala
deleted file mode 100644
index 99a83d72a8..0000000000
--- a/src/library/scala/IterableProxy.scala
+++ /dev/null
@@ -1,79 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import scala.collection.mutable.Buffer
-
-
-/** This class implements a proxy for iterable objects. It forwards
- *  all calls to a different iterable object.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-trait IterableProxy[+A] extends Iterable[A] with Proxy {
-
-  override def self: Iterable[A]
-
-  override def elements = self.elements
-  @deprecated
-  override def concat [B >: A](that: Iterable[B]) = self concat that
-  override def ++[B >: A](that: Iterable[B]) = self ++ that
-  override def map[B](f: A => B) = self map f
-  override def flatMap[B](f: A => Iterable[B]) = self flatMap f
-  override def filter(p: A => Boolean) = self filter p
-  override def partition(p: A => Boolean) = self partition p
-  override def takeWhile(p: A => Boolean) = self takeWhile p
-  override def dropWhile(p: A => Boolean) = self dropWhile p
-  @deprecated override def take(n: Int) = self take n
-  @deprecated override def drop(n: Int) = self drop n
-  override def foreach(f: A => Unit) = self foreach f
-  override def forall(p: A => Boolean) = self forall p
-  override def exists(p: A => Boolean) = self exists p
-  override def find(p: A => Boolean) = self find p
-  @deprecated override def findIndexOf(p: A => Boolean) = self findIndexOf p
-  @deprecated override def indexOf[B >: A](elem: B): Int = self indexOf elem
-  override def foldLeft[B](z: B)(op: (B, A) => B) = (self foldLeft z)(op)
-  override def foldRight[B](z: B)(op: (A, B) => B) = (self foldRight z)(op)
-  override def /:[B](z: B)(op: (B, A) => B) = (z /: self)(op)
-  override def :\[B](z: B)(op: (A, B) => B) = (self :\ z)(op)
-  override def reduceLeft[B >: A](op: (B, A) => B) = self reduceLeft op
-  override def reduceRight[B >: A](op: (A, B) => B) = self reduceRight op
-  override def copyToBuffer[B >: A](dest: Buffer[B]) = self copyToBuffer dest
-  override def sameElements[B >: A](that: Iterable[B]) = self sameElements that
-
-  override def toList = self.toList
-  override def toSeq = self.toSeq
-  override def toStream = self.toStream
-
-  override def mkString(start: String, sep: String, end: String) = self.mkString(start, sep, end)
-  override def mkString(sep: String) = self.mkString(sep)
-  override def mkString = self.mkString
-
-  override def addString(buf: StringBuilder, start: String, sep: String, end: String) =
-    self.addString(buf, start, sep, end)
-
-  override def addString(buf: StringBuilder, sep: String) =
-    self.addString(buf, sep)
-
-  override def addString(buf: StringBuilder) =
-    self.addString(buf)
-
-  override def copyToArray[B >: A](xs: Array[B], start: Int) = self.copyToArray(xs, start)
-
-  override def isEmpty = self.isEmpty
-
-  override def projection = self.projection
-
-  override def hasDefiniteSize = self.hasDefiniteSize
-}
diff --git a/src/library/scala/Iterator.scala b/src/library/scala/Iterator.scala
deleted file mode 100644
index b5092a2430..0000000000
--- a/src/library/scala/Iterator.scala
+++ /dev/null
@@ -1,778 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-
-import Predef._
-import collection.mutable.{Buffer, ListBuffer, ArrayBuffer}
-import annotation.tailrec
-
-/** The <code>Iterator</code> object provides various functions for
- *  creating specialized iterators.
- *
- *  @author  Martin Odersky
- *  @author  Matthias Zenger
- *  @version 1.2, 10/02/2007
- */
-object Iterator {
-
-  val empty = new Iterator[Nothing] {
-    def hasNext: Boolean = false
-    def next(): Nothing = throw new NoSuchElementException("next on empty iterator")
-  }
-
-  /**
-   *  @param x the element
-   *  @return  the iterator with one single element
-   */
-  def single[a](x: a) = new Iterator[a] {
-    private var hasnext = true
-    def hasNext: Boolean = hasnext
-    def next(): a =
-      if (hasnext) { hasnext = false; x }
-      else throw new NoSuchElementException("next on empty iterator")
-  }
-
-  def fromValues[a](xs: a*) = xs.elements
-
-  /**
-   *  @param xs the array of elements
-   *  @see also: RandomAccessSeq.elements and slice
-   */
-  def fromArray[a](xs: Array[a]): Iterator[a] =
-    fromArray(xs, 0, xs.length)
-
-  /**
-   *  @param xs     the array of elements
-   *  @param start  the start index
-   *  @param length  the length
-   *  @see also: RandomAccessSeq.elements and slice
-   */
-  @throws(classOf[NoSuchElementException])
-  def fromArray[a](xs: Array[a], start: Int, length: Int): Iterator[a] =
-    new BufferedIterator.Advanced[a] {
-      private var i = start
-      val end = if (start + length < xs.length) start + length else xs.length
-      override def hasNext: Boolean = i < end
-      def next(): a =
-        if (hasNext) { val x = xs(i) ; i += 1 ; x }
-        else throw new NoSuchElementException("next on empty iterator")
-
-      override protected def defaultPeek : a = throw new NoSuchElementException("no lookahead")
-      override def peekList(sz: Int): Seq[a] =
-        xs.slice(i, if (i + sz > xs.length) xs.length else i + sz)
-  }
-
-  /**
-   *  @param str the given string
-   *  @return    the iterator on <code>str</code>
-   *  @deprecated replaced by <code>str.elements</code>
-   */
-  @deprecated def fromString(str: String): Iterator[Char] =
-    new BufferedIterator.Advanced[Char] {
-      private var i = 0
-      private val len = str.length()
-      override def hasNext = i < len
-      def next = { val c = str charAt i; i += 1; c }
-
-      override protected def defaultPeek : Char = throw new NoSuchElementException
-      override def peekList(sz: Int): Seq[Char] =
-        str.substring(i, if (i + sz > str.length) str.length else i + sz)
-    }
-
-  /**
-   *  @param n the product arity
-   *  @return  the iterator on <code>Product&lt;n&gt;</code>.
-   */
-  def fromProduct(n: Product): Iterator[Any] = new Iterator[Any] {
-    private var c: Int = 0
-    private val cmax = n.productArity
-    def hasNext = c < cmax
-    def next() = { val a = n productElement c; c += 1; a }
-  }
-
-  /**
-   * @deprecated use <code>fromProduct</code> instead.
-   */
-  @deprecated
-  def fromCaseClass(n: Product) = fromProduct(n)
-
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + 1</code>
-   *  where <code>e<sub>0</sub> = start</code>
-   *  and <code>e<sub>i</sub> &lt; end</code>. However,
-   *  if <code>start &ge; end</code>, then it will return an empty range.
-   *
-   *  @param start the start value of the iterator
-   *  @param end   the end value of the iterator
-   *  @return      the iterator with values in range <code>[start;end)</code>.
-   */
-  def range(start: Int, end: Int): Iterator[Int] = range(start, end, 1)
-
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + step</code>
-   *  where <code>e<sub>0</sub> = start</code>
-   *  and elements are in the range between <code>start</code> (inclusive)
-   *  and <code>end</code> (exclusive)
-   *
-   *  @param start the start value of the iterator
-   *  @param end   the end value of the iterator
-   *  @param step  the increment value of the iterator (must be positive or negative)
-   *  @return      the iterator with values in range <code>[start;end)</code>.
-   */
-  @throws(classOf[NoSuchElementException])
-  def range(start: Int, end: Int, step: Int) = new Iterator[Int] {
-    private var i = start
-    def hasNext: Boolean = (step <= 0 || i < end) && (step >= 0 || i > end)
-    def next(): Int =
-      if (hasNext) { val j = i; i += step; j }
-      else throw new NoSuchElementException("next on empty iterator")
-  }
-
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = step(e<sub>n</sub>)</code>
-   *  where <code>e<sub>0</sub> = start</code>
-   *  and elements are in the range between <code>start</code> (inclusive)
-   *  and <code>end</code> (exclusive)
-   *
-   *  @param start the start value of the iterator
-   *  @param end   the end value of the iterator
-   *  @param step  the increment function of the iterator, must be monotonically increasing or decreasing
-   *  @return      the iterator with values in range <code>[start;end)</code>.
-   */
-  @throws(classOf[NoSuchElementException])
-  def range(start: Int, end: Int, step: Int => Int) = new Iterator[Int] {
-    private val up = step(start) > start
-    private val down = step(start) < start
-    private var i = start
-    def hasNext: Boolean = (!up || i < end) && (!down || i > end)
-    def next(): Int =
-      if (hasNext) { val j = i; i = step(i); j }
-      else throw new NoSuchElementException("next on empty iterator")
-  }
-
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + 1</code>
-   *  where <code>e<sub>0</sub> = start</code>.
-   *
-   *  @param start the start value of the iterator
-   *  @return      the iterator starting at value <code>start</code>.
-   */
-  def from(start: Int): Iterator[Int] = from(start, 1)
-
-  /** Create an iterator with elements
-   * <code>e<sub>n+1</sub> = e<sub>n</sub> + step</code>
-   *  where <code>e<sub>0</sub> = start</code>.
-   *
-   *  @param start the start value of the iterator
-   *  @param step  the increment value of the iterator
-   *  @return      the iterator starting at value <code>start</code>.
-   */
-  def from(start: Int, step: Int): Iterator[Int] = from(start, {x:Int => x + step})
-
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = step(e<sub>n</sub>)</code>
-   *  where <code>e<sub>0</sub> = start</code>.
-   *
-   *  @param start the start value of the iterator
-   *  @param step  the increment function of the iterator
-   *  @return      the iterator starting at value <code>start</code>.
-   */
-  def from(start: Int, step: Int => Int): Iterator[Int] = new Iterator[Int] {
-    private var i = start
-    override def hasNext: Boolean = true
-    def next(): Int = { val j = i; i = step(i); j }
-  }
-
-  /** Create an iterator that is the concantenation of all iterators
-   *  returned by a given iterator of iterators.
-   *   @param its   The iterator which returns on each call to next
-   *                a new iterator whose elements are to be concatenated to the result.
-   */
-  def flatten[T](its: Iterator[Iterator[T]]): Iterator[T] = new Iterator[T] {
-    private var it = its.next
-    def hasNext: Boolean = {
-      while (!it.hasNext && its.hasNext) it = its.next
-      it.hasNext
-    }
-    def next(): T =
-      if (hasNext) it.next
-      else empty.next()
-  }
-}
-
-/** Iterators are data structures that allow to iterate over a sequence
- *  of elements. They have a <code>hasNext</code> method for checking
- *  if there is a next element available, and a <code>next</code> method
- *  which returns the next element and discards it from the iterator.
- *
- *  @author  Martin Odersky, Matthias Zenger
- *  @version 1.2, 15/03/2004
- */
-trait Iterator[+A] {
-
-  /** Does this iterator provide another element?
-   */
-  def hasNext: Boolean
-
-  /** Returns the next element.
-   */
-  def next(): A
-
-
-  /** Returns a new iterator that iterates only over the first <code>n</code>
-   *  elements.
-   *
-   *  @param n the number of elements to take
-   *  @return  the new iterator
-   */
-  @throws(classOf[NoSuchElementException])
-  def take(n: Int): Iterator[A] = new Iterator[A] {
-    var remaining = n
-    def hasNext = remaining > 0 && Iterator.this.hasNext
-    def next(): A =
-      if (hasNext) { remaining -= 1; Iterator.this.next }
-      else throw new NoSuchElementException("next on empty iterator")
-  }
-
-  /** Removes the first <code>n</code> elements from this iterator.
-   *
-   *  @param n the number of elements to drop
-   *  @return  the new iterator
-   */
-  def drop(n: Int): Iterator[A] = {
-    @tailrec
-    def loop(left: Int): Iterator[A] =
-      if (left > 0 && hasNext) { next; loop(left - 1) }
-      else this
-
-    loop(n)
-  }
-
-  /** A sub-iterator of <code>until - from elements
-   *  starting at index <code>from</code>
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until    The index of the element following the slice
-   */
-  def slice(from: Int, until: Int): Iterator[A] = drop(from).take(until - from)
-
-  /** Returns a new iterator that maps all elements of this iterator
-   *  to new elements using function <code>f</code>.
-   */
-  def map[B](f: A => B): Iterator[B] = new Iterator[B] {
-    def hasNext = Iterator.this.hasNext
-    def next() = f(Iterator.this.next)
-  }
-
-  /** Returns a new iterator that first yields the elements of this
-   *  iterator followed by the elements provided by iterator <code>that</code>.
-   *  @deprecated  use <code>++</code>
-   */
-  def append[B >: A](that: Iterator[B]) = new Iterator[B] {
-    def hasNext = Iterator.this.hasNext || that.hasNext
-    def next() = if (Iterator.this.hasNext) Iterator.this.next else that.next
-  }
-
-  /** Returns a new iterator that first yields the elements of this
-   *  iterator followed by the elements provided by iterator <code>that</code>.
-   */
-  def ++[B >: A](that: => Iterator[B]) = new Iterator[B] {
-    // optimize a little bit to prevent n log n behavior.
-    var what : Iterator[B] = Iterator.this
-    def hasNext = if (what.hasNext) true
-                  else if (what eq Iterator.this) {
-                    what = that
-                    what.hasNext
-                  } else false
-
-    def next = { hasNext; what.next }
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this iterator, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  an iterator over <code>f(a<sub>0</sub>), ... ,
-   *           f(a<sub>n</sub>)</code> if this iterator yields the
-   *           elements <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  @throws(classOf[NoSuchElementException])
-  def flatMap[B](f: A => Iterator[B]): Iterator[B] = new Iterator[B] {
-    private var cur: Iterator[B] = Iterator.empty
-    def hasNext: Boolean =
-      if (cur.hasNext) true
-      else if (Iterator.this.hasNext) {
-        cur = f(Iterator.this.next)
-        hasNext
-      } else false
-    def next(): B =
-      if (cur.hasNext) cur.next
-      else if (Iterator.this.hasNext) {
-        cur = f(Iterator.this.next)
-        next
-      } else throw new NoSuchElementException("next on empty iterator")
-  }
-
-  protected class PredicatedIterator(p : A => Boolean) extends BufferedIterator.Default[A] {
-    protected def doEnd : Boolean = false
-    protected override def fill(sz: Int): Seq[A] = {
-      while (true) {
-        if (!Iterator.this.hasNext) return Nil
-        val ret = Iterator.this.next
-        if (p(ret)) return ret :: Nil
-        if (doEnd) return Nil
-      }
-      throw new Error
-    }
-  }
-  protected class TakeWhileIterator(p : A => Boolean) extends PredicatedIterator(p) {
-    private var ended = false
-    override protected def doEnd = {
-      ended = true; true
-    }
-    override protected def fill(sz : Int) : Seq[A] =
-      if (ended) Nil else super.fill(sz)
-  }
-
-
-  /** Returns an iterator over all the elements of this iterator that
-   *  satisfy the predicate <code>p</code>. The order of the elements
-   *  is preserved.
-   *
-   *  @param p the predicate used to filter the iterator.
-   *  @return  the elements of this iterator satisfying <code>p</code>.
-   */
-  def filter(p: A => Boolean): Iterator[A] = new PredicatedIterator(p)
-
-  /** Returns an iterator over the longest prefix of this iterator such that
-   *  all elements of the result satisfy the predicate <code>p</code>.
-   *  The order of the elements is preserved.
-   *
-   *  The behavior of <code>this</code> iterator is undefined after this method invocation.
-   *
-   *  @param p the predicate used to filter the iterator.
-   *  @return  the longest prefix of this iterator satisfying <code>p</code>.
-   */
-  def takeWhile(p: A => Boolean): Iterator[A] = new TakeWhileIterator(p)
-
-  /** Skips longest sequence of elements of this iterator which satisfy given
-   *  predicate <code>p</code>, and returns an iterator of the remaining elements.
-   *
-   *  The behavior of <code>this</code> iterator is undefined after this method invocation.
-   *
-   *  @param p the predicate used to skip elements.
-   *  @return  an iterator consisting of the remaining elements
-   */
-  def dropWhile(p: A => Boolean): Iterator[A] = {
-    @tailrec
-    def loop(): Iterator[A] =
-      if (hasNext) {
-        val x = next
-        if (p(x)) loop()
-        else Iterator.single(x) append this
-      }
-      else this
-
-    loop()
-  }
-
-  /** Return an iterator formed from this iterator and the specified iterator
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two iterators is longer than the other, its remaining elements are ignored.
-   *
-   *  @return     an iterator yielding <code>{a<sub>0</sub>,b<sub>0</sub>},
-   *              {a<sub>1</sub>,b<sub>1</sub>}, ...</code> where
-   *              <code>a<sub>i</sub></code> are the elements from this iterator
-   *              and <code>b<sub>i</sub></code> are the elements from iterator
-   *              <code>that</code>.
-   */
-  def zip[B](that: Iterator[B]) = new Iterator[(A, B)] {
-    def hasNext = Iterator.this.hasNext && that.hasNext
-    def next = (Iterator.this.next, that.next)
-  }
-
-  /** Return an iterator that pairs each element of this iterator
-   *  with its index, counting from 0.
-   *
-   *  @return      an iterator yielding <code>{a<sub>0</sub>,0},
-   *               {a<sub>1</sub>,1}...</code> where <code>a<sub>i</sub></code>
-   *               are the elements from this iterator.
-   */
-  def zipWithIndex = new Iterator[(A, Int)] {
-    var idx = 0
-    def hasNext = Iterator.this.hasNext
-    def next = {
-      val ret = (Iterator.this.next, idx)
-      idx += 1
-      ret
-    }
-  }
-
-  /** Apply a function <code>f</code> to all elements of this
-   *  iterable object.
-   *
-   *  @param  f   a function that is applied to every element.
-   */
-  def foreach(f: A => Unit) { while (hasNext) f(next) }
-
-  /** Apply a predicate <code>p</code> to all elements of this
-   *  iterable object and return <code>true</code> iff the predicate yields
-   *  <code>true</code> for all elements.
-   *
-   *  @param p the predicate
-   *  @return  <code>true</code> iff the predicate yields <code>true</code>
-   *           for all elements.
-   */
-  def forall(p: A => Boolean): Boolean = {
-    var res = true
-    while (res && hasNext) res = p(next)
-    res
-  }
-
-  /** Apply a predicate <code>p</code> to all elements of this
-   *  iterable object and return true, iff there is at least one
-   *  element for which <code>p</code> yields <code>true</code>.
-   *
-   *  @param p the predicate
-   *  @return  <code>true</code> iff the predicate yields <code>true</code>
-   *           for at least one element.
-   */
-  def exists(p: A => Boolean): Boolean = {
-    var res = false
-    while (!res && hasNext) res = p(next)
-    res
-  }
-
-  /** Tests if the given value <code>elem</code> is a member of this iterator.
-   *
-   *  @param elem element whose membership has to be tested.
-   *  @return     <code>true</code> iff there is an element of this iterator which
-   *              is equal (w.r.t. <code>==</code>) to <code>elem</code>.
-   */
-  def contains(elem: Any): Boolean = exists { _ == elem }
-
-  /** Find and return the first element of the iterable object satisfying a
-   *  predicate, if any.
-   *
-   *  @param p the predicate
-   *  @return  the first element in the iterable object satisfying
-   *           <code>p</code>, or <code>None</code> if none exists.
-   */
-  def find(p: A => Boolean): Option[A] = {
-    var res: Option[A] = None
-    while (res.isEmpty && hasNext) {
-      val e = next
-      if (p(e)) res = Some(e)
-    }
-    res
-  }
-
-  /** Returns index of the first element satisying a predicate, or -1.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @return   the index of the first element satisfying <code>p</code>,
-   *           or -1 if such an element does not exist
-   */
-  def findIndexOf(p: A => Boolean): Int = {
-    var i = 0
-    var found = false
-    while (!found && hasNext) {
-      if (p(next)) {
-        found = true
-      } else {
-        i += 1
-      }
-    }
-    if (found) i else -1
-  }
-
-  /** Returns the index of the first occurence of the specified
-   *  object in this iterable object.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  elem  element to search for.
-   *  @return the index in this sequence of the first occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   */
-  def indexOf[B >: A](elem: B): Int = {
-    var i = 0
-    var found = false
-    while (!found && hasNext) {
-      if (next == elem) {
-        found = true
-      } else {
-        i += 1
-      }
-    }
-    if (found) i else -1
-  }
-
-  /** Combines the elements of this iterator together using the binary
-   *  operator <code>op</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>op(... (op(op(z,a<sub>0</sub>),a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the iterator yields elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   */
-  def foldLeft[B](z: B)(op: (B, A) => B): B = {
-    var acc = z
-    while (hasNext) acc = op(acc, next)
-    acc
-  }
-
-  /** Combines the elements of this iterator together using the binary
-   *  operator <code>op</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n</sub> op z)...)</code>
-   *          if the iterator yields elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   */
-  def foldRight[B](z: B)(op: (A, B) => B): B = {
-    def fold(z: B): B = if (hasNext) op(next, fold(z)) else z
-    fold(z)
-  }
-
-  /** Similar to <code>foldLeft</code> but can be used as
-   *  an operator with the order of iterator and zero arguments reversed.
-   *  That is, <code>z /: xs</code> is the same as <code>xs foldLeft z</code>.
-   *
-   *  @param z the left argument of the first application of <code>op</code>
-   *           (evaluation occurs from left to right).
-   *  @param op the applied operator.
-   *  @return  the result value
-   *  @see     <code><a href="#foldLeft">foldLeft</a></code>.
-   */
-  def /:[B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
-
-  /** An alias for <code>foldRight</code>.
-   *  That is, <code>xs :\ z</code> is the same as <code>xs foldRight z</code>.
-   *
-   *  @param z the right argument of the first application of <code>op</code>
-   *           (evaluation occurs from right to left).
-   *  @param op the applied operator.
-   *  @return  the result value.
-   *  @see     <code><a href="#foldRight">foldRight</a></code>.
-   */
-  def :\[B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
-
-  /** Combines the elements of this iterator together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the iterator yields elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  @throws(classOf[UnsupportedOperationException])
-  def reduceLeft[B >: A](op: (B, A) => B): B = {
-    if (hasNext) foldLeft[B](next)(op)
-    else throw new UnsupportedOperationException("empty.reduceLeft")
-  }
-
-  /** Combines the elements of this iterator together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the iterator yields elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  @throws(classOf[UnsupportedOperationException])
-  def reduceRight[B >: A](op: (A, B) => B): B = {
-    if (!hasNext) throw new UnsupportedOperationException("empty.reduceRight")
-    val x = next
-    if (hasNext) op(x, reduceRight(op))
-    else x
-  }
-
-  /** Returns a buffered iterator from this iterator.
-   */
-  def buffered: BufferedIterator[A] = new BufferedIterator.Default[A] {
-    protected def fill(sz : Int) = if (Iterator.this.hasNext) (Iterator.this.next) :: Nil else Nil
-  }
-
-  /** Returns a counted iterator from this iterator.
-   */
-  def counted = new CountedIterator[A] {
-    private var cnt = -1
-    def count = cnt
-    def hasNext: Boolean = Iterator.this.hasNext
-    def next(): A = { cnt += 1; Iterator.this.next }
-  }
-
-  /** Creates two new iterators that both iterate over the same elements
-   *  than this iterator (in the same order).
-   *
-   *  @return a pair of iterators
-   */
-  def duplicate: (Iterator[A], Iterator[A]) = {
-    var xs: List[A] = Nil
-    var ahead: Iterator[A] = null
-    class Partner extends Iterator[A] {
-      var ys: List[A] = Nil
-      def hasNext: Boolean = Iterator.this.synchronized (
-        ((this == ahead) && Iterator.this.hasNext) ||
-        ((this != ahead) && (!xs.isEmpty || !ys.isEmpty || Iterator.this.hasNext))
-      )
-      def next(): A = Iterator.this.synchronized {
-        if (this == ahead) {
-          val e = Iterator.this.next
-          xs = e :: xs; e
-        } else {
-          if (ys.isEmpty) {
-            ys = xs.reverse
-            xs = Nil
-          }
-          ys match {
-            case Nil =>
-              val e = Iterator.this.next
-              ahead = this
-              xs = e :: xs; e
-            case z :: zs =>
-              ys = zs; z
-          }
-        }
-      }
-    }
-    ahead = new Partner
-    (ahead, new Partner)
-  }
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.
-   *
-   *  @param  xs    the array to fill.
-   *  @param  start the starting index.
-   *  @pre          the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int) {
-    var i = start
-    while (hasNext) {
-      xs(i) = next
-      i += 1
-    }
-  }
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.  Like <code>copyToArray</code>,
-   *  but designed to accomodate IO stream operations.
-   *
-   *  @param  xs    the array to fill.
-   *  @param  start the starting index.
-   *  @param  sz    the maximum number of elements to be read.
-   *  @pre          the array must be large enough to hold <code>sz</code> elements.
-   */
-  def readInto[B >: A](xs: Array[B], start: Int, sz: Int) {
-    var i = start
-    while (hasNext && i - start < sz) {
-      xs(i) = next
-      i += 1
-    }
-  }
-  def readInto[B >: A](xs: Array[B], start: Int) {
-    readInto(xs, start, xs.length - start)
-  }
-  def readInto[B >: A](xs: Array[B]) {
-    readInto(xs, 0, xs.length)
-  }
-
-  /** Copy all elements to a buffer
-   *  @param   The buffer to which elements are copied
-   *  @return  The buffer to which elements are copied
-   */
-  def copyToBuffer[B >: A](dest: Buffer[B]) {
-    while (hasNext) dest += next
-  }
-
-  /** Transform this iterator into a list of all elements.
-   *
-   *  @return  a list which enumerates all elements of this iterator.
-   */
-  def toList: List[A] = {
-    val res = new ListBuffer[A]
-    while (hasNext) res += next
-    res.toList
-  }
-
-  /** Collect elements into a seq.
-   *
-   * @return  a seq which enumerates all elements of this iterator.
-   */
-  def collect: Seq[A] = {
-    val buffer = new ArrayBuffer[A]
-    this copyToBuffer buffer
-    buffer.readOnly
-  }
-
-  /** Returns a string representation of the elements in this iterator. The resulting string
-   *  begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   *  <p/>
-   *  Ex: <br/>
-   *  <code>List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"</code>
-   *
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(start: String, sep: String, end: String): String = {
-    val buf = new StringBuilder
-    addString(buf, start, sep, end).toString
-  }
-
-  /** Returns a string representation of this iterable object. The string
-   *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   *
-   *  @param sep separator string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(sep: String): String = this.mkString("", sep, "")
-
-  /** Returns a string representation of this iterable object. The string
-   *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by a comma.
-   *
-   *  @return a string representation of this iterable object.
-   */
-  def mkString: String =
-    mkString("")
-
-  /** Write all elements of this string into given string builder.
-   *
-   *  @param buf   ...
-   *  @param start the starting string
-   *  @param sep   the separator string
-   *  @param end   the ending string
-   *  @return      ...
-   */
-  def addString(buf: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
-    buf.append(start)
-    val elems = this
-    if (elems.hasNext) buf.append(elems.next)
-    while (elems.hasNext) {
-      buf.append(sep); buf.append(elems.next)
-    }
-    buf.append(end)
-  }
-  override def toString = (if (hasNext) "non-empty" else "empty")+" iterator"
-}
diff --git a/src/library/scala/List.scala b/src/library/scala/List.scala
deleted file mode 100644
index 8b25050de3..0000000000
--- a/src/library/scala/List.scala
+++ /dev/null
@@ -1,1459 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import scala.collection.mutable.{ListBuffer, LinkedHashMap}
-import annotation.tailrec
-import Predef._
-
-/** This object provides methods for creating specialized lists, and for
- *  transforming special kinds of lists (e.g. lists of lists).
- *
- *  @author  Martin Odersky and others
- *  @version 1.0, 15/07/2003
- */
-object List {
-
-  /** Create a list with given elements.
-   *
-   *  @param xs the elements to put in the list
-   *  @return the list containing elements xs.
-   */
-  def apply[A](xs: A*): List[A] = xs.toList
-
-  /** for unapply matching
-   */
-  def unapplySeq[A](x: List[A]): Some[List[A]] = Some(x)
-
-  /** Create a sorted list of all integers in a range.
-   *
-   *  @param from the start value of the list
-   *  @param end the end value of the list
-   *  @return the sorted list of all integers in range [from;end).
-   */
-  def range(start: Int, end: Int): List[Int] =
-    range(start, end, 1)
-
-  /** Create a list with element values
-   * <code>v<sub>n+1</sub> = v<sub>n</sub> + step</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and elements are in the range between <code>start</code> (inclusive)
-   * and <code>end</code> (exclusive)
-   *
-   *  @param start the start value of the list
-   *  @param end  the end value of the list
-   *  @param step the increment value of the list
-   *  @return     the sorted list of all integers in range [start;end).
-   */
-  def range(start: Int, end: Int, step: Int): List[Int] = {
-    if (step == 0)
-      throw new IllegalArgumentException("step is zero")
-    val b = new ListBuffer[Int]
-    var i = start
-    while ((step <= 0 || i < end) && (step >= 0 || i > end)) {
-      b += i
-      i += step
-    }
-    b.toList
-  }
-
-  /** Create a sorted list with element values
-   * <code>v<sub>n+1</sub> = step(v<sub>n</sub>)</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and elements are in the range between <code>start</code> (inclusive)
-   * and <code>end</code> (exclusive)
-   *
-   *  @param start the start value of the list
-   *  @param end  the end value of the list
-   *  @param step the increment function of the list, which given <code>v<sub>n</sub></code>,
-   *              computes <code>v<sub>n+1</sub></code>. Must be monotonically increasing
-   *              or decreasing.
-   *  @return     the sorted list of all integers in range [start;end).
-   */
-  def range(start: Int, end: Int, step: Int => Int): List[Int] = {
-    val up = step(start) > start
-    val down = step(start) < start
-    val b = new ListBuffer[Int]
-    var i = start
-    while ((!up || i < end) && (!down || i > end)) {
-      b += i
-      val next = step(i)
-      if (i == next)
-        throw new IllegalArgumentException("the step function did not make any progress on "+ i)
-      i = next
-    }
-    b.toList
-  }
-
-  /** Create a list containing several copies of an element.
-   *
-   *  @param n    the length of the resulting list
-   *  @param elem the element composing the resulting list
-   *  @return     a list composed of n elements all equal to elem
-   */
-  def make[A](n: Int, elem: A): List[A] = {
-    val b = new ListBuffer[A]
-    var i = 0
-    while (i < n) {
-      b += elem
-      i += 1
-    }
-    b.toList
-  }
-
-  /** Create a list by applying a function to successive integers.
-   *
-   *  @param n     the length of the resulting list
-   *  @param maker the procedure which, given an integer <code>n</code>,
-   *               returns the nth element of the resulting list, where
-   *               <code>n</code> is in interval <code>[0;n)</code>.
-   *  @return      the list obtained by applying the maker function to
-   *               successive integers from 0 to n (exclusive).
-   */
-  def tabulate[A](n: Int, maker: Int => A): List[A] = {
-    val b = new ListBuffer[A]
-    var i = 0
-    while (i < n) {
-      b += maker(i)
-      i += 1
-    }
-    b.toList
-  }
-
-  /** Concatenate all the elements of a given list of lists.
-   *
-   *  @param xss the list of lists that are to be concatenated
-   *  @return    the concatenation of all the lists
-   */
-  def flatten[A](xss: List[List[A]]): List[A] = concat(xss: _*)
-
-  /** Concatenate all the argument lists into a single list.
-   *
-   *  @param xss the lists that are to be concatenated
-   *  @return the concatenation of all the lists
-   */
-  def concat[A](xss: List[A]*): List[A] = {
-    val b = new ListBuffer[A]
-    for (xs <- xss) {
-      var xc = xs
-      while (!xc.isEmpty) {
-        b += xc.head
-        xc = xc.tail
-      }
-    }
-    b.toList
-  }
-
-  /** Transforms a list of pairs into a pair of lists.
-   *
-   *  @param xs the list of pairs to unzip
-   *  @return a pair of lists.
-   */
-  def unzip[A,B](xs: List[(A,B)]): (List[A], List[B]) = {
-    val b1 = new ListBuffer[A]
-    val b2 = new ListBuffer[B]
-    var xc = xs
-    while (!xc.isEmpty) {
-      b1 += xc.head._1
-      b2 += xc.head._2
-      xc = xc.tail
-    }
-    (b1.toList, b2.toList)
-  }
-
-  /** Transforms an iterable of pairs into a pair of lists.
-   *
-   *  @param xs the iterable of pairs to unzip
-   *  @return a pair of lists.
-   */
-  def unzip[A,B](xs: Iterable[(A,B)]): (List[A], List[B]) =
-      xs.foldRight[(List[A], List[B])]((Nil, Nil)) {
-        case ((x, y), (xs, ys)) => (x :: xs, y :: ys)
-      }
-
-  /**
-   * Returns the <code>Left</code> values in the given <code>Iterable</code> of <code>Either</code>s.
-   */
-  def lefts[A, B](es: Iterable[Either[A, B]]) =
-    es.foldRight[List[A]](Nil)((e, as) => e match {
-      case Left(a) => a :: as
-      case Right(_) => as
-    })
-
-  /**
-   * Returns the <code>Right</code> values in the given<code>Iterable</code> of  <code>Either</code>s.
-   */
-  def rights[A, B](es: Iterable[Either[A, B]]) =
-    es.foldRight[List[B]](Nil)((e, bs) => e match {
-      case Left(_) => bs
-      case Right(b) => b :: bs
-    })
-
-  /** Transforms an Iterable of Eithers into a pair of lists.
-   *
-   *  @param xs the iterable of Eithers to separate
-   *  @return a pair of lists.
-   */
-  def separate[A,B](es: Iterable[Either[A,B]]): (List[A], List[B]) =
-      es.foldRight[(List[A], List[B])]((Nil, Nil)) {
-      case (Left(a), (lefts, rights)) => (a :: lefts, rights)
-      case (Right(b), (lefts, rights)) => (lefts, b :: rights)
-    }
-
-  /** Converts an iterator to a list.
-   *
-   *  @param it the iterator to convert
-   *  @return   a list that contains the elements returned by successive
-   *            calls to <code>it.next</code>
-   */
-  def fromIterator[A](it: Iterator[A]): List[A] = it.toList
-
-  /** Converts an array into a list.
-   *
-   *  @param arr the array to convert
-   *  @return    a list that contains the same elements than <code>arr</code>
-   *             in the same order
-   */
-  def fromArray[A](arr: Array[A]): List[A] = fromArray(arr, 0, arr.length)
-
-  /** Converts a range of an array into a list.
-   *
-   *  @param arr   the array to convert
-   *  @param start the first index to consider
-   *  @param len   the lenght of the range to convert
-   *  @return      a list that contains the same elements than <code>arr</code>
-   *               in the same order
-   */
-  def fromArray[A](arr: Array[A], start: Int, len: Int): List[A] = {
-    var res: List[A] = Nil
-    var i = start + len
-    while (i > start) {
-      i -= 1
-      res = arr(i) :: res
-    }
-    res
-  }
-
-  /** Parses a string which contains substrings separated by a
-   *  separator character and returns a list of all substrings.
-   *
-   *  @param str       the string to parse
-   *  @param separator the separator character
-   *  @return          the list of substrings
-   */
-  def fromString(str: String, separator: Char): List[String] = {
-    var words: List[String] = Nil
-    var pos = str.length()
-    while (pos > 0) {
-      val pos1 = str.lastIndexOf(separator, pos - 1)
-      if (pos1 + 1 < pos)
-        words = str.substring(pos1 + 1, pos) :: words
-      pos = pos1
-    }
-    words
-  }
-
-  /** Returns the given string as a list of characters.
-   *
-   *  @param str the string to convert.
-   *  @return    the string as a list of characters.
-   *  @deprecated use <code>str.toList</code> instead
-   */
-  @deprecated def fromString(str: String): List[Char] =
-    str.toList
-
-  /** Returns the given list of characters as a string.
-   *
-   *  @param xs the list to convert.
-   *  @return   the list in form of a string.
-   */
-  def toString(xs: List[Char]): String = {
-    val sb = new StringBuilder()
-    var xc = xs
-    while (!xc.isEmpty) {
-      sb.append(xc.head)
-      xc = xc.tail
-    }
-    sb.toString()
-  }
-
-  /** Like xs map f, but returns <code>xs</code> unchanged if function
-   *  <code>f</code> maps all elements to themselves.
-   *
-   *  @param xs ...
-   *  @param f  ...
-   *  @return   ...
-   */
-  def mapConserve[A <: AnyRef](xs: List[A])(f: A => A): List[A] = {
-    def loop(ys: List[A]): List[A] =
-      if (ys.isEmpty) xs
-      else {
-        val head0 = ys.head
-        val head1 = f(head0)
-        if (head1 eq head0) {
-          loop(ys.tail)
-        } else {
-          val ys1 = head1 :: mapConserve(ys.tail)(f)
-          if (xs eq ys) ys1
-          else {
-            val b = new ListBuffer[A]
-            var xc = xs
-            while (xc ne ys) {
-              b += xc.head
-              xc = xc.tail
-            }
-            b.prependToList(ys1)
-          }
-        }
-      }
-    loop(xs)
-  }
-
-  /** Returns the list resulting from applying the given function <code>f</code>
-   *  to corresponding elements of the argument lists.
-   *
-   *  @param f function to apply to each pair of elements.
-   *  @return <code>[f(a0,b0), ..., f(an,bn)]</code> if the lists are
-   *          <code>[a0, ..., ak]</code>, <code>[b0, ..., bl]</code> and
-   *          <code>n = min(k,l)</code>
-   */
-  def map2[A,B,C](xs: List[A], ys: List[B])(f: (A, B) => C): List[C] = {
-    val b = new ListBuffer[C]
-    var xc = xs
-    var yc = ys
-    while (!xc.isEmpty && !yc.isEmpty) {
-      b += f(xc.head, yc.head)
-      xc = xc.tail
-      yc = yc.tail
-    }
-    b.toList
-  }
-
-  /** Returns the list resulting from applying the given function
-   *  <code>f</code> to corresponding elements of the argument lists.
-   *
-   *  @param f function to apply to each pair of elements.
-   *  @return  <code>[f(a<sub>0</sub>,b<sub>0</sub>,c<sub>0</sub>),
-   *           ..., f(a<sub>n</sub>,b<sub>n</sub>,c<sub>n</sub>)]</code>
-   *           if the lists are <code>[a<sub>0</sub>, ..., a<sub>k</sub>]</code>,
-   *           <code>[b<sub>0</sub>, ..., b<sub>l</sub>]</code>,
-   *           <code>[c<sub>0</sub>, ..., c<sub>m</sub>]</code> and
-   *           <code>n = min(k,l,m)</code>
-   */
-  def map3[A,B,C,D](xs: List[A], ys: List[B], zs: List[C])(f: (A, B, C) => D): List[D] = {
-    val b = new ListBuffer[D]
-    var xc = xs
-    var yc = ys
-    var zc = zs
-    while (!xc.isEmpty && !yc.isEmpty && !zc.isEmpty) {
-      b += f(xc.head, yc.head, zc.head)
-      xc = xc.tail
-      yc = yc.tail
-      zc = zc.tail
-    }
-    b.toList
-  }
-
-  /** Tests whether the given predicate <code>p</code> holds
-   *  for all corresponding elements of the argument lists.
-   *
-   *  @param p function to apply to each pair of elements.
-   *  @return  <code>(p(a<sub>0</sub>,b<sub>0</sub>) &amp;&amp;
-   *           ... &amp;&amp; p(a<sub>n</sub>,b<sub>n</sub>))]</code>
-   *           if the lists are <code>[a<sub>0</sub>, ..., a<sub>k</sub>]</code>;
-   *           <code>[b<sub>0</sub>, ..., b<sub>l</sub>]</code>
-   *           and <code>n = min(k,l)</code>
-   */
-  def forall2[A,B](xs: List[A], ys: List[B])(f: (A, B) => Boolean): Boolean = {
-    var xc = xs
-    var yc = ys
-    while (!xc.isEmpty && !yc.isEmpty) {
-      if (!f(xc.head, yc.head)) return false
-      xc = xc.tail
-      yc = yc.tail
-    }
-    true
-  }
-
-  /** Tests whether the given predicate <code>p</code> holds
-   *  for some corresponding elements of the argument lists.
-   *
-   *  @param p function to apply to each pair of elements.
-   *  @return  <code>n != 0 &amp;&amp; (p(a<sub>0</sub>,b<sub>0</sub>) ||
-   *           ... || p(a<sub>n</sub>,b<sub>n</sub>))]</code> if the lists are
-   *           <code>[a<sub>0</sub>, ..., a<sub>k</sub>]</code>,
-   *           <code>[b<sub>0</sub>, ..., b<sub>l</sub>]</code> and
-   *           <code>n = min(k,l)</code>
-   */
-  def exists2[A,B](xs: List[A], ys: List[B])(f: (A, B) => Boolean): Boolean = {
-    var xc = xs
-    var yc = ys
-    while (!xc.isEmpty && !yc.isEmpty) {
-      if (f(xc.head, yc.head)) return true
-      xc = xc.tail
-      yc = yc.tail
-    }
-    false
-  }
-
-  /** Transposes a list of lists.
-   *  pre: All element lists have the same length.
-   *
-   *  @param xss the list of lists
-   *  @return    the transposed list of lists
-   */
-  def transpose[A](xss: List[List[A]]): List[List[A]] = {
-    val buf = new ListBuffer[List[A]]
-    var yss = xss
-    while (!yss.head.isEmpty) {
-      buf += (yss map (_.head))
-      yss = (yss map (_.tail))
-    }
-    buf.toList
-  }
-
-  /** Lists with ordered elements are ordered
-  implicit def list2ordered[a <% Ordered[a]](x: List[a]): Ordered[List[a]] = new Ordered[List[a]] {
-    def compare [b >: List[a] <% Ordered[b]](y: b): Int = y match {
-      case y1: List[a] => compareLists(x, y1);
-      case _ => -(y compare x)
-    }
-    private def compareLists(xs: List[a], ys: List[a]): Int = {
-      if (xs.isEmpty && ys.isEmpty) 0
-      else if (xs.isEmpty) -1
-      else if (ys.isEmpty) 1
-      else {
-        val s = xs.head compare ys.head;
-        if (s != 0) s
-        else compareLists(xs.tail, ys.tail)
-      }
-    }
-  }
-   */
-}
-
-/** A class representing an ordered collection of elements of type
- *  <code>a</code>. This class comes with two implementing case
- *  classes <code>scala.Nil</code> and <code>scala.::</code> that
- *  implement the abstract members <code>isEmpty</code>,
- *  <code>head</code> and <code>tail</code>.
- *
- *  @author  Martin Odersky and others
- *  @version 1.0, 16/07/2003
- */
-sealed abstract class List[+A] extends Seq[A] with Product {
-
-  /** Returns true if the list does not contain any elements.
-   *  @return <code>true</code>, iff the list is empty.
-   */
-  override def isEmpty: Boolean
-
-  /** Returns this first element of the list.
-   *
-   *  @return the first element of this list.
-   *  @throws Predef.NoSuchElementException if the list is empty.
-   */
-  def head: A
-
-  /** Result of comparing <code>length</code> with operand <code>l</code>.
-   *  returns <code>x</code> where
-   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; l</code>
-   *  <code>x == 0</code>   iff    <code>this.length == l</code>
-   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; that</code>.
-   *
-   *  This method is used by matching streams against right-ignoring (...,_*) patterns.
-   *
-   *  This method does not call <code>List.length</code>, it works for <code>O(l)</code>,
-   *  not for <code>O(length)</code>.
-   */
-  override def lengthCompare(l: Int) = {
-    if (isEmpty) 0 - l
-    else if (l <= 0) 1
-    else tail.lengthCompare(l - 1)
-  }
-
-  /** Returns this list without its first element.
-   *
-   *  @return this list without its first element.
-   *  @throws Predef.NoSuchElementException if the list is empty.
-   */
-  def tail: List[A]
-
-  /** <p>
-   *    Add an element <code>x</code> at the beginning of this list.
-   *  </p>
-   *
-   *  @param x the element to prepend.
-   *  @return  the list with <code>x</code> added at the beginning.
-   *  @ex <code>1 :: List(2, 3) = List(2, 3).::(1) = List(1, 2, 3)</code>
-   */
-  def ::[B >: A] (x: B): List[B] =
-    new scala.::(x, this)
-
-  /** <p>
-   *    Add an element <code>x</code> at the end of this list.
-   *  </p>
-   *
-   *  @deprecated Replace uses of <code>l + e</code> with <code>l ::: List(e)</code>.
-   *
-   *  @param x the element to append.
-   *  @return  the list with <code>x</code> added at the end.
-   */
-  @deprecated def +[B >: A](x: B): List[B] =
-    if (isEmpty) List(x)
-    else {
-      val buf = new ListBuffer[B]
-      this copyToBuffer buf
-      buf += x
-      buf.toList
-    }
-
-  /** <p>
-   *    Returns a list resulting from the concatenation of the given
-   *    list <code>prefix</code> and this list.
-   *  </p>
-   *
-   *  @param prefix the list to concatenate at the beginning of this list.
-   *  @return the concatenation of the two lists.
-   *  @ex <code>List(1, 2) ::: List(3, 4) = List(3, 4).:::(List(1, 2)) = List(1, 2, 3, 4)</code>
-   */
-  def :::[B >: A](prefix: List[B]): List[B] =
-    if (isEmpty) prefix
-    else {
-      val b = new ListBuffer[B]
-      var those = prefix
-      while (!those.isEmpty) {
-        b += those.head
-        those = those.tail
-      }
-      b.prependToList(this)
-    }
-
-  /** Appends two list objects.
-   */
-  override def ++[B >: A](that: Iterable[B]): List[B] =
-    this ::: that.toList
-
-  /** Reverse the given prefix and append the current list to that.
-   *  This function is equivalent to an application of <code>reverse</code>
-   *  on the prefix followed by a call to <code>:::</code>, but more
-   *  efficient.
-   *
-   *  @param prefix the prefix to reverse and then prepend
-   *  @return       the concatenation of the reversed prefix and the current list.
-   */
-  def reverse_:::[B >: A](prefix: List[B]): List[B] = {
-    var these: List[B] = this
-    var pres = prefix
-    while (!pres.isEmpty) {
-      these = pres.head :: these
-      pres = pres.tail
-    }
-    these
-  }
-
-  /** Returns the number of elements in the list.
-   *
-   *  @return the number of elements in the list.
-   */
-  def length: Int = {
-    var these = this
-    var len = 0
-    while (!these.isEmpty) {
-      len += 1
-      these = these.tail
-    }
-    len
-  }
-
-  /** Creates a list with all indices in the list. This is
-   *  equivalent to a call to <code>List.range(0, xs.length)</code>.
-   *
-   *  @return a list of all indices in the list.
-   */
-  def indices: List[Int] = {
-    val b = new ListBuffer[Int]
-    var i = 0
-    var these = this
-    while (!these.isEmpty) {
-      b += i
-      i += 1
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Returns the elements in the list as an iterator
-   *
-   *  @return an iterator on the list elements.
-   */
-  override def elements: Iterator[A] = new Iterator[A] {
-    var these = List.this
-    def hasNext: Boolean = !these.isEmpty
-    def next: A =
-      if (!hasNext)
-        throw new NoSuchElementException("next on empty Iterator")
-      else {
-        val result = these.head; these = these.tail; result
-      }
-    override def toList: List[A] = these
-  }
-
-  /** Overrides the method in Iterable for efficiency.
-   *
-   *  @return  the list itself
-   */
-  override def toList: List[A] = this
-
-  /** Returns the list without its last element.
-   *
-   *  @return the list without its last element.
-   *  @throws Predef.UnsupportedOperationException if the list is empty.
-   */
-  def init: List[A] =
-    if (isEmpty) throw new UnsupportedOperationException("Nil.init")
-    else {
-      val b = new ListBuffer[A]
-      var elem = head
-      var next = tail
-      while (!next.isEmpty) {
-        b += elem
-        elem = next.head
-        next = next.tail
-      }
-      b.toList
-    }
-
-  /** Returns the last element of this list.
-   *
-   *  @return the last element of the list.
-   *  @throws Predef.NoSuchElementException if the list is empty.
-   */
-  override def last: A =
-    if (isEmpty) throw new Predef.NoSuchElementException("Nil.last")
-    else {
-      var cur = this
-      var next = this.tail
-      while (!next.isEmpty) {
-        cur = next
-        next = next.tail
-      }
-      cur.head
-    }
-
-  /** Returns the <code>n</code> first elements of this list, or else the whole
-   *  list, if it has less than <code>n</code> elements.
-   *
-   *  @param n the number of elements to take.
-   *  @return the <code>n</code> first elements of this list.
-   */
-  override def take(n: Int): List[A] = {
-    val b = new ListBuffer[A]
-    var i = 0
-    var these = this
-    while (!these.isEmpty && i < n) {
-      i += 1
-      b += these.head
-      these = these.tail
-    }
-    if (these.isEmpty) this
-    else b.toList
-  }
-
-  /** Returns the list with elements belonging to the given index range.
-   *
-   *  @param start the start position of the list slice.
-   *  @param end   the end position (exclusive) of the list slice.
-   *  @return the list with elements belonging to the given index range.
-   */
-  override def slice(start: Int, end: Int): List[A] = {
-    val s = start max 0
-    val e = end min this.length
-    drop(s) take (e - s)
-  }
-
-  /** Returns the list without its <code>n</code> first elements.
-   *  If this list has less than <code>n</code> elements, the empty list is returned.
-   *
-   *  @param n the number of elements to drop.
-   *  @return the list without its <code>n</code> first elements.
-   */
-  override def drop(n: Int): List[A] = {
-    var these = this
-    var count = n
-    while (!these.isEmpty && count > 0) {
-      these = these.tail
-      count -= 1
-    }
-    these
-  }
-
-  /** Returns the rightmost <code>n</code> elements from this list.
-   *
-   *  @param n the number of elements to take
-   *  @return the suffix of length <code>n</code> of the list
-   */
-  def takeRight(n: Int): List[A] = {
-    @tailrec
-    def loop(lead: List[A], lag: List[A]): List[A] = lead match {
-      case Nil => lag
-      case _ :: tail => loop(tail, lag.tail)
-    }
-    loop(drop(n), this)
-  }
-
-  /** Returns the list wihout its rightmost <code>n</code> elements.
-   *
-   *  @param n the number of elements to take
-   *  @return the list without its rightmost <code>n</code> elements
-   */
-  def dropRight(n: Int): List[A] = {
-    def loop(lead: List[A], lag: List[A]): List[A] = lead match {
-      case Nil => Nil
-      case _ :: tail => lag.head :: loop(tail, lag.tail)
-    }
-    loop(drop(n), this)
-  }
-
-  /** Split the list at a given point and return the two parts thus
-   *  created.
-   *
-   *  @param n the position at which to split
-   *  @return  a pair of lists composed of the first <code>n</code>
-   *           elements, and the other elements.
-   */
-  def splitAt(n: Int): (List[A], List[A]) = {
-    val b = new ListBuffer[A]
-    var i = 0
-    var these = this
-    while (!these.isEmpty && i < n) {
-      i += 1
-      b += these.head
-      these = these.tail
-    }
-    (b.toList, these)
-  }
-
-  /** Returns the longest prefix of this list whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest prefix of this list whose elements satisfy
-   *           the predicate <code>p</code>.
-   */
-  override def takeWhile(p: A => Boolean): List[A] = {
-    val b = new ListBuffer[A]
-    var these = this
-    while (!these.isEmpty && p(these.head)) {
-      b += these.head
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Returns the longest suffix of this list whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest suffix of the list whose first element
-   *           does not satisfy the predicate <code>p</code>.
-   */
-  override def dropWhile(p: A => Boolean): List[A] = {
-    @tailrec
-    def loop(xs: List[A]): List[A] =
-      if (xs.isEmpty || !p(xs.head)) xs
-      else loop(xs.tail)
-
-    loop(this)
-  }
-
-  /** Returns the longest prefix of the list whose elements all satisfy
-   *  the given predicate, and the rest of the list.
-   *
-   *  @param p the test predicate
-   *  @return  a pair consisting of the longest prefix of the list whose
-   *           elements all satisfy <code>p</code>, and the rest of the list.
-   */
-  def span(p: A => Boolean): (List[A], List[A]) = {
-    val b = new ListBuffer[A]
-    var these = this
-    while (!these.isEmpty && p(these.head)) {
-      b += these.head
-      these = these.tail
-    }
-    (b.toList, these)
-  }
-
-  /** Like <code>span</code> but with the predicate inverted.
-   */
-  def break(p: A => Boolean): (List[A], List[A]) = span { x => !p(x) }
-
-  /** Returns the <code>n</code>-th element of this list. The first element
-   *  (head of the list) is at position 0.
-   *
-   *  @param n index of the element to return
-   *  @return  the element at position <code>n</code> in this list.
-   *  @throws Predef.NoSuchElementException if the list is too short.
-   */
-  def apply(n: Int): A = drop(n).head
-
-  /** Returns the list resulting from applying the given function <code>f</code> to each
-   *  element of this list.
-   *
-   *  @param f function to apply to each element.
-   *  @return <code>[f(a0), ..., f(an)]</code> if this list is <code>[a0, ..., an]</code>.
-   */
-  final override def map[B](f: A => B): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      b += f(these.head)
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Apply a function to all the elements of the list, and return the
-   *  reversed list of results. This is equivalent to a call to <code>map</code>
-   *  followed by a call to <code>reverse</code>, but more efficient.
-   *
-   *  @param f the function to apply to each elements.
-   *  @return  the reversed list of results.
-   */
-  def reverseMap[B](f: A => B): List[B] = {
-    @tailrec
-    def loop(l: List[A], res: List[B]): List[B] = l match {
-      case Nil => res
-      case head :: tail => loop(tail, f(head) :: res)
-    }
-    loop(this, Nil)
-  }
-
-  /** Apply the given function <code>f</code> to each element of this list
-   *  (while respecting the order of the elements).
-   *
-   *  @param f the treatment to apply to each element.
-   */
-  final override def foreach(f: A => Unit) {
-    var these = this
-    while (!these.isEmpty) {
-      f(these.head)
-      these = these.tail
-    }
-  }
-
-  /** Returns all the elements of this list that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *  It is guarenteed that the receiver list itself is returned iff all its
-   *  elements satisfy the predicate `p'. Hence the following equality is valid:
-   *
-   *  (xs filter p) eq xs  ==  xs forall p
-   *
-   *  @param p the predicate used to filter the list.
-   *  @return the elements of this list satisfying <code>p</code>.
-   */
-  final override def filter(p: A => Boolean): List[A] = {
-    // return same list if all elements satisfy p
-    var these = this
-    while (!these.isEmpty && p(these.head)) {
-      these = these.tail
-    }
-    if (these.isEmpty) this
-    else {
-      val b = new ListBuffer[A]
-      var these1 = this
-      while (these1 ne these) {
-        b += these1.head
-        these1 = these1.tail
-      }
-
-      these = these.tail // prevent the second evaluation of the predicate
-                         // on the element on which it first failed
-      while (!these.isEmpty) {
-        if (p(these.head)) b += these.head
-        these = these.tail
-      }
-      b.toList
-    }
-  }
-
-//  final def filterMap[B](f: PartialFunction[A, B]): List[B] =
-//    this filter f.isDefinedAt map f
-
-  /** Removes all elements of the list which satisfy the predicate
-   *  <code>p</code>. This is like <code>filter</code> with the
-   *  predicate inversed.
-   *
-   *  @param p the predicate to use to test elements
-   *  @return  the list without all elements which satisfy <code>p</code>
-   */
-  def remove(p: A => Boolean): List[A] = filter (x => !p(x))
-
-  /** Partition the list in two sub-lists according to a predicate.
-   *
-   *  @param p the predicate on which to partition
-   *  @return  a pair of lists: the list of all elements which satisfy
-   *           <code>p</code> and the list of all elements which do not.
-   *           The relative order of the elements in the sub-lists is the
-   *           same as in the original list.
-   */
-  override def partition(p: A => Boolean): (List[A], List[A]) = {
-    val btrue = new ListBuffer[A]
-    val bfalse = new ListBuffer[A]
-    var these = this
-    while (!these.isEmpty) {
-      (if (p(these.head)) btrue else bfalse) += these.head
-      these = these.tail
-    }
-    (btrue.toList, bfalse.toList)
-  }
-
-  /** <p>
-   *    Sort the list according to the comparison function
-   *    <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>,
-   *    which should be true iff <code>e1</code> is smaller than
-   *    <code>e2</code>.
-   *  </p>
-   *
-   *  @param lt the comparison function
-   *  @return   a list sorted according to the comparison function
-   *            <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>.
-   *  @ex <pre>
-   *    List("Steve", "Tom", "John", "Bob")
-   *      .sort((e1, e2) => (e1 compareTo e2) &lt; 0) =
-   *    List("Bob", "John", "Steve", "Tom")</pre>
-   */
-  def sort(lt : (A,A) => Boolean): List[A] = {
-    /** Merge two already-sorted lists */
-    def merge(l1: List[A], l2: List[A]): List[A] = {
-      val res = new ListBuffer[A]
-      var left1 = l1
-      var left2 = l2
-
-      while (!left1.isEmpty && !left2.isEmpty) {
-	if(lt(left1.head, left2.head)) {
-	  res += left1.head
-	  left1 = left1.tail
-	} else {
-	  res += left2.head
-	  left2 = left2.tail
-	}
-      }
-
-      res ++= left1
-      res ++= left2
-
-      res.toList
-    }
-
-    /** Split a list into two lists of about the same size */
-    def split(lst: List[A]) = {
-      val res1 = new ListBuffer[A]
-      val res2 = new ListBuffer[A]
-      var left = lst
-
-      while (!left.isEmpty) {
-	res1 += left.head
-	left = left.tail
-	if (!left.isEmpty) {
-	  res2 += left.head
-	  left = left.tail
-	}
-      }
-
-      (res1.toList, res2.toList)
-    }
-
-
-    /** Merge-sort the specified list */
-    def ms(lst: List[A]): List[A] =
-      lst match {
-	case Nil => lst
-	case x :: Nil => lst
-	case x :: y :: Nil =>
-	  if (lt(x,y))
-	    lst
-	  else
-	    y :: x :: Nil
-
-	case lst =>
-          val (l1, l2) = split(lst)
-          val l1s = ms(l1)
-          val l2s = ms(l2)
-          merge(l1s, l2s)
-      }
-
-    ms(this)
-  }
-
-
-  /** Count the number of elements in the list which satisfy a predicate.
-   *
-   *  @param p the predicate for which to count
-   *  @return  the number of elements satisfying the predicate <code>p</code>.
-   */
-  def count(p: A => Boolean): Int = {
-    var cnt = 0
-    var these = this
-    while (!these.isEmpty) {
-      if (p(these.head)) cnt += 1
-      these = these.tail
-    }
-    cnt
-  }
-
-  /** Tests if the predicate <code>p</code> is satisfied by all elements
-   *  in this list.
-   *
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff all elements of this list satisfy the
-   *           predicate <code>p</code>.
-   */
-  override def forall(p: A => Boolean): Boolean = {
-    var these = this
-    while (!these.isEmpty) {
-      if (!p(these.head)) return false
-      these = these.tail
-    }
-    true
-  }
-
-  /** Tests the existence in this list of an element that satisfies the
-   *  predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff there exists an element in this list that
-   *           satisfies the predicate <code>p</code>.
-   */
-  override def exists(p: A => Boolean): Boolean = {
-    var these = this
-    while (!these.isEmpty) {
-      if (p(these.head)) return true
-      these = these.tail
-    }
-    false
-  }
-
-  /** Find and return the first element of the list satisfying a
-   *  predicate, if any.
-   *
-   *  @param p the predicate
-   *  @return the first element in the list satisfying <code>p</code>,
-   *  or <code>None</code> if none exists.
-   */
-  override def find(p: A => Boolean): Option[A] = {
-    var these = this
-    while (!these.isEmpty) {
-      if (p(these.head)) return Some(these.head)
-      these = these.tail
-    }
-    None
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the list is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  override def foldLeft[B](z: B)(f: (B, A) => B): B = {
-    var acc = z
-    var these = this
-    while (!these.isEmpty) {
-      acc = f(acc, these.head)
-      these = these.tail
-    }
-    acc
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  function <code>f</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the list is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  override def foldRight[B](z: B)(f: (A, B) => B): B = this match {
-    case Nil => z
-    case x :: xs => f(x, xs.foldRight(z)(f))
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the list has elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the list is empty.
-   */
-  override def reduceLeft[B >: A](f: (B, A) => B): B = this match {
-    case Nil => throw new UnsupportedOperationException("Nil.reduceLeft")
-    case x :: Nil => x
-    case x0 :: x1 :: xs =>
-      var acc : B = f(x0, x1)
-      var these : List[A] = xs
-      while (!these.isEmpty) {
-        acc = f(acc, these.head)
-        these = these.tail
-      }
-      acc
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the list has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   *
-   *  @throws Predef.UnsupportedOperationException if the list is empty.
-   */
-  override def reduceRight[B >: A](f: (A, B) => B): B = this match {
-    case Nil => throw new UnsupportedOperationException("Nil.reduceRight")
-    case x :: Nil => x
-    case x :: xs => f(x, xs reduceRight f)
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this list, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this list is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  final override def flatMap[B](f: A => Iterable[B]): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      var those = f(these.head).elements
-      while (those.hasNext) {
-        b += those.next
-      }
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** A list consisting of all elements of this list in reverse order.
-   */
-  override def reverse: List[A] = {
-    var result: List[A] = Nil
-    var these = this
-    while (!these.isEmpty) {
-      result = these.head :: result
-      these = these.tail
-    }
-    result
-  }
-
-  /** Returns a list formed from this list and the specified list
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two lists is longer than the other, its remaining elements are ignored.
-   *
-   *  @return     <code>List((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *              (a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>))</code> when
-   *              <code>List(a<sub>0</sub>, ..., a<sub>m</sub>)
-   *              zip List(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
-   */
-  def zip[B](that: List[B]): List[(A, B)] = {
-    val b = new ListBuffer[(A, B)]
-    var these = this
-    var those = that
-    while (!these.isEmpty && !those.isEmpty) {
-      b += ((these.head, those.head))
-      these = these.tail
-      those = those.tail
-    }
-    b.toList
-  }
-
-  /** Returns a list that pairs each element of this list
-   *  with its index, counting from 0.
-   *
-   *  @return      the list <code>List((a<sub>0</sub>,0), (a<sub>1</sub>,1), ...)</code>
-   *               where <code>a<sub>i</sub></code> are the elements of this list.
-   */
-  def zipWithIndex: List[(A, Int)] = {
-    val b = new ListBuffer[(A, Int)]
-    var these = this
-    var idx = 0
-
-    while(!these.isEmpty) {
-      b += ((these.head, idx))
-      these = these.tail
-      idx += 1
-    }
-
-    b.toList
-  }
-
-  /** Returns a list formed from this list and the specified list
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *
-   *  @param that     list <code>that</code> may have a different length
-   *                  as the self list.
-   *  @param thisElem element <code>thisElem</code> is used to fill up the
-   *                  resulting list if the self list is shorter than
-   *                  <code>that</code>
-   *  @param thatElem element <code>thatElem</code> is used to fill up the
-   *                  resulting list if <code>that</code> is shorter than
-   *                  the self list
-   *  @return         <code>List((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
-   *                  ..., {elem,b<sub>m</sub>})</code>
-   *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
-   *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
-   *                  invoked where <code>m &gt; n</code>.
-   */
-  def zipAll[B, C >: A, D >: B](that: List[B], thisElem: C, thatElem: D): List[(C, D)] = {
-    val b = new ListBuffer[(C, D)]
-    var these = this
-    var those = that
-    while (!these.isEmpty && !those.isEmpty) {
-      b += ((these.head, those.head))
-      these = these.tail
-      those = those.tail
-    }
-    while (!these.isEmpty) {
-      b += ((these.head, thatElem))
-      these = these.tail
-    }
-    while (!those.isEmpty) {
-      b += ((thisElem, those.head))
-      those = those.tail
-    }
-    b.toList
-  }
-
-  /** <p>
-   *    Computes the multiset union of this list and the given list
-   *    <code>that</code>. For example:
-   *  </p><pre>
-   *    <b>val</b> xs = List(1, 1, 2)
-   *    <b>val</b> ys = List(1, 2, 2, 3)
-   *    println(xs union ys)  // prints "List(1, 1, 2, 1, 2, 2, 3)"
-   *    println(ys union xs)  // prints "List(1, 2, 2, 3, 1, 1, 2)"
-   *  </pre>
-   *
-   *  @param that the list of elements to add to the list.
-   *  @return     a list containing the elements of this
-   *              list and those of the given list <code>that</code>.
-   */
-  def union[B >: A](that: List[B]): List[B] = this ++ that
-
-  /** <p>
-   *    Computes the multiset intersection between this list and the
-   *    given list <code>that</code>; the intersection contains <i>m</i>
-   *    copies of an element contained in both lists, where <i>m</i> is
-   *    the smaller of the number of times the element appears in this
-   *    list or in <code>that</code>. For example:
-   *  </p><pre>
-   *    <b>val</b> xs = List(1, 1, 2)
-   *    <b>val</b> ys = List(3, 2, 2, 1)
-   *    println(xs intersect ys)  // prints "List(1, 2)"
-   *    println(ys intersect xs)  // prints "List(2, 1)"
-   *  </pre>
-   *
-   *  @param that the list to intersect.
-   *  @return     the list of elements contained both in this list and
-   *              in the given list <code>that</code>.
-   */
-  def intersect[B >: A](that: List[B]): List[B] = {
-    val occ = new LinkedHashMap[B, Int]
-    that foreach (e => if (occ contains e) occ(e) += 1 else occ(e) = 1)
-    val buf = new ListBuffer[B]
-    for (e <- this if occ contains e) {
-      if (occ(e) > 0) { occ(e) -= 1; buf += e }
-    }
-    buf.toList
-  }
-
-  /** <p>
-   *    Computes the multiset difference between this list and the
-   *    given list <code>that</code>. If an element appears more
-   *    than once in both lists, the difference contains <i>m</i> copies
-   *    of that element, where <i>m</i> is the difference between the
-   *    number of times the element appears in this list and the number
-   *    of times it appears in <code>that</code>. For example:
-   *  </p><pre>
-   *    <b>val</b> xs = List(1, 1, 2)
-   *    <b>val</b> ys = List(1, 2, 2, 3)
-   *    println(xs diff ys)  // prints "List(1)"
-   *    println(xs -- ys)    // prints "List()"
-   *  </pre>
-   *
-   *  @param that the list of elements to remove from this list.
-   *  @return     the list of elements contained only in this list plus
-   *              <i>m</i> copies of each element present in both lists,
-   *              where <i>m</i> is defined as above.
-   */
-  def diff[B >: A](that: List[B]): List[B] = {
-    val occ = new LinkedHashMap[B, Int]
-    that foreach (e => if (occ contains e) occ(e) += 1 else occ(e) = 1)
-    val buf = new ListBuffer[B]
-    for (e <- this) {
-      if (occ contains e)
-        if (occ(e) > 0) occ(e) -= 1
-        else buf += e
-      else buf += e
-    }
-    buf.toList
-  }
-
-  /** Computes the difference between this list and the given list
-   *  <code>that</code>.
-   *
-   *  @param that the list of elements to remove from this list.
-   *  @return     this list without the elements of the given list
-   *              <code>that</code>.
-   */
-  def -- [B >: A](that: List[B]): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      if (!that.contains(these.head)) b += these.head
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Computes the difference between this list and the given object
-   *  <code>x</code>.
-   *
-   *  @param x    the object to remove from this list.
-   *  @return     this list without the elements of the given object
-   *              <code>x</code>.
-   */
-  def - [B >: A](x: B): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      if (these.head != x) b += these.head
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Concatenate the elements of this list. The elements of this list
-   *  should be a <code>Iterables</code>.
-   *
-   *  Note: The compiler might not be able to infer the type parameter,
-   *        so it is recommended to provide an explicit type argument.
-   *
-   *  Example:
-   *    <code>List(List(1, 3), List(2)).flatten[Int]</code>
-   *    returns
-   *    <code>List(1, 3, 2)</code>
-   *
-   *  @param f    An implicit conversion to an <code>Iterable</code> instance.
-   *  @return     The concatenation of all elements of iterables in this list.
-   */
-  def flatten[B](implicit f : A => Iterable[B]) : List[B] = {
-    val buf = new ListBuffer[B]
-    foreach(f(_).foreach(buf += _))
-    buf.toList
-  }
-
-  /** Removes redundant elements from the list. Uses the method <code>==</code>
-   *  to decide if two elements are identical.
-   *
-   *  @return the list without doubles.
-   */
-  def removeDuplicates: List[A] = {
-    val b = new ListBuffer[A]
-    var these = this
-    while (!these.isEmpty) {
-      if (!these.tail.contains(these.head)) b += these.head
-      these = these.tail
-    }
-    b.toList
-  }
-
-  override protected def stringPrefix = "List"
-  override def projection = toStream
-  override def toStream : Stream[A] = new Stream.Definite[A] {
-    override def force : List[A] = List.this
-    override def isEmpty = List.this.isEmpty
-    override def head = List.this.head
-    override def tail = List.this.tail.toStream
-    protected def addDefinedElems(buf: StringBuilder, prefix: String): StringBuilder = if (!isEmpty) {
-      var prefix0 = prefix
-      var buf1 = buf.append(prefix0).append(head)
-      prefix0 = ", "
-      var tail0 = tail
-      while (!tail0.isEmpty) {
-        buf1 = buf.append(prefix0).append(tail0.head)
-        tail0 = tail0.tail
-      }
-      buf1
-    } else buf
-  }
-
-}
-
-/** The empty list.
- *
- *  @author  Martin Odersky
- *  @version 1.0, 15/07/2003
- */
-@SerialVersionUID(0 - 8256821097970055419L)
-case object Nil extends List[Nothing] {
-  override def isEmpty = true
-  def head: Nothing =
-    throw new NoSuchElementException("head of empty list")
-  def tail: List[Nothing] =
-    throw new NoSuchElementException("tail of empty list")
-}
-
-/** A non empty list characterized by a head and a tail.
- *
- *  @author  Martin Odersky
- *  @version 1.0, 15/07/2003
- */
-@SerialVersionUID(0L - 8476791151983527571L)
-final case class ::[B](private var hd: B, private[scala] var tl: List[B]) extends List[B] {
-  def head : B = hd
-  def tail : List[B] = tl
-  override def isEmpty: Boolean = false
-
-  import java.io._
-
-  private def writeObject(out: ObjectOutputStream) {
-    var xs: List[B] = this
-    while (!xs.isEmpty) { out.writeObject(xs.head); xs = xs.tail }
-    out.writeObject(ListSerializeEnd)
-  }
-
-  private def readObject(in: ObjectInputStream) {
-    hd = in.readObject.asInstanceOf[B]
-    assert(hd != ListSerializeEnd)
-    var current: ::[B] = this
-    while (true) in.readObject match {
-      case ListSerializeEnd =>
-        current.tl = Nil
-        return
-      case a : Any =>
-        val list : ::[B] = new ::(a.asInstanceOf[B], Nil)
-        current.tl = list
-        current = list
-    }
-  }
-}
-
-/** Only used for list serialization */
-@SerialVersionUID(0L - 8476791151975527571L)
-private[scala] case object ListSerializeEnd
diff --git a/src/library/scala/Mutable.scala b/src/library/scala/Mutable.scala
new file mode 100755
index 0000000000..2c596e2b81
--- /dev/null
+++ b/src/library/scala/Mutable.scala
@@ -0,0 +1,11 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala
+
+/** A marker trait for mutable datatructures such as mutable collections */
+trait Mutable
diff --git a/src/library/scalax/Numeric.scala b/src/library/scala/Numeric.scala
index 6e61851dc5..4f7e4749cf 100755
--- a/src/library/scalax/Numeric.scala
+++ b/src/library/scala/Numeric.scala
@@ -1,4 +1,4 @@
-package scalax
+package scala
 
 object Numeric {
   implicit object IntIsIntegral extends Integral[Int] {
diff --git a/src/library/scala/Predef.scala b/src/library/scala/Predef.scala
index 8b4c00bf9c..93c9e29040 100644
--- a/src/library/scala/Predef.scala
+++ b/src/library/scala/Predef.scala
@@ -61,6 +61,10 @@ object Predef {
 
   // miscelleaneous -----------------------------------------------------
 
+  private val P = scala.`package`  // to force scala package object to be seen.
+  private val L = scala.collection.immutable.List // to force Nil, :: to be seen.
+  private val S = scala.collection.mutable.StringBuilder // to force StringBuilder to be seen.
+
   val $scope = scala.xml.TopScope
 
   type Function[-A, +B] = Function1[A, B]
@@ -189,7 +193,6 @@ object Predef {
   implicit def unitWrapper(x: Boolean)  = new runtime.RichUnit
 
   implicit def stringWrapper(x: String) = new runtime.RichString(x)
-  implicit def stringBuilderWrapper(x : StringBuilder): runtime.RichStringBuilder = new runtime.RichStringBuilder(x)
 
   implicit def any2stringadd(x: Any) = new runtime.StringAdd(x)
 
@@ -331,12 +334,12 @@ object Predef {
   implicit def boolean2Boolean(x: Boolean)  = java.lang.Boolean.valueOf(x)
 
   /** any array projection can be automatically converted into an array */
-  implicit def forceArrayProjection[A](x: Array.Projection[A]): Array[A] = x.force
+  //implicit def forceArrayProjection[A](x: Array.Projection[A]): Array[A] = x.force !!! re-enable?
   /** any random access character seq (including rich string can be converted into a string */
-  implicit def forceRandomAccessCharSeq(x: runtime.RichString): String = x.mkString
-  implicit def lazyStreamToConsable[A](xs: => Stream[A]) = new runtime.StreamCons(xs)
+  //implicit def forceRandomAccessCharSeq(x: runtime.RichString): String = x.mkString
+  //implicit def lazyStreamToConsable[A](xs: => Stream[A]) = new runtime.StreamCons(xs)
 
-  implicit def seqToCharSequence(xs: RandomAccessSeq[Char]): CharSequence = new CharSequence {
+  implicit def seqToCharSequence(xs: collection.Vector[Char]): CharSequence = new CharSequence {
     def length: Int = xs.length
     def charAt(index: Int): Char = xs(index)
     def subSequence(start: Int, end: Int): CharSequence = seqToCharSequence(xs.slice(start, end))
diff --git a/src/library/scala/RandomAccessSeq.scala b/src/library/scala/RandomAccessSeq.scala
deleted file mode 100644
index 2c5c637a6f..0000000000
--- a/src/library/scala/RandomAccessSeq.scala
+++ /dev/null
@@ -1,245 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala
-
-import collection.mutable.ArrayBuffer
-
-object RandomAccessSeq {
-
-  /** Create read only sequence of specified elements */
-  def apply[A](xs: A*): RandomAccessSeq[A] =
-    if (xs.isEmpty) empty
-    else {
-      val buffer = new ArrayBuffer[A]
-      xs copyToBuffer buffer
-      buffer.readOnly
-    }
-
-  /** The empty sequence */
-  val empty : RandomAccessSeq[Nothing] = new RandomAccessSeq.Projection[Nothing] {
-    def length = 0
-    def apply(i: Int): Nothing = throw new NoSuchElementException("empty sequence")
-    override def elements = Iterator.empty
-    override def projection = this
-    override def force = this
-  }
-
-  trait Projection[+A] extends Seq.Projection[A] with RandomAccessSeq[A] {
-    override def projection = this
-    override def force : RandomAccessSeq[A] = toArray
-    protected class MapProjection[B](f : A => B) extends super.MapProjection(f) with Projection[B]
-    override def map[B](f: A => B) : Projection[B] = new MapProjection[B](f)
-    override def append[B >: A](that: => Iterable[B]): Projection[B] = {
-      val that0 : Seq[B] = that match {
-      case that : Seq.Projection[b] => that
-      case that : Seq[b] => that
-      case that => that.toList
-      }
-      new Projection[B] {
-        def length = Projection.this.length + that0.length
-        def apply(idx : Int) =
-          if (idx < Projection.this.length) Projection.this(idx)
-          else that0(idx - Projection.this.length)
-      }
-    }
-  }
-  private[scala] trait Slice[+A] extends Projection[A] {
-    protected def from  : Int
-    protected def until : Int
-    protected def underlying : RandomAccessSeq[A]
-    def length = {
-      val length0 = underlying.length
-      if (from >= until || from >= length0) 0
-      else (if (until >= length0) length0 else until) - (if (from < 0) 0 else from)
-    }
-    def apply(idx : Int) = if (idx < 0 || idx >= length) throw new Predef.IndexOutOfBoundsException
-                           else underlying.apply((if (from < 0) 0 else from) + idx)
-    override def slice(from0 : Int, until0 : Int) = {
-      val from = if (this.from < 0) 0 else this.from
-      underlying.slice(from + from0, from + until0)
-    }
-  }
-  private[scala] trait Patch[+A] extends Projection[A] {
-    protected def original : RandomAccessSeq[A]
-    protected def patch : RandomAccessSeq[A]
-    protected def from : Int
-    protected def replaced : Int
-    def length = original.length + patch.length - replaced
-    def apply(idx : Int) =
-      if (idx < from) original.apply(idx)
-      else if (idx < from + patch.length) patch.apply(idx - from)
-      else original.apply(idx - patch.length + replaced)
-    override def stringPrefix = "patch"
-  }
-
-  /** A random access sequence that supports update (e.g., an array) */
-  trait Mutable[A] extends RandomAccessSeq[A] {
-    /** <p>
-     *    Update the element at given index.
-     *  </p>
-     *  <p>
-     *    Indices start a <code>0</code>; <code>xs.apply(0)</code> is the first
-     *    element of mutable sequence <code>xs</code>.
-     *  </p>
-     *  <p>
-     *    Note the indexing syntax <code>xs(i) = x</code> is a shorthand
-     *    for <code>xs.update(i, x)</code>.
-     *  </p>
-     *
-     *  @param i   the index
-     *  @param x   the value to be written at index <code>i</code>
-     *  @throws ArrayIndexOutOfBoundsException if <code>i < 0</code> or
-     *          <code>length <= i</code>
-     */
-    def update(idx : Int, what : A) : Unit
-    override def projection : MutableProjection[A] = new MutableProjection[A] {
-      override def force : Mutable[A] = Mutable.this
-      def update(idx : Int, what : A) : Unit = Mutable.this.update(idx, what)
-      def length = Mutable.this.length
-      def apply(idx : Int) = Mutable.this.apply(idx)
-    }
-    def readOnly : RandomAccessSeq[A] = new RandomAccessSeq[A] {
-      def length = Mutable.this.length
-      def apply(idx : Int) = Mutable.this.apply(idx)
-      override def stringPrefix = Mutable.this.stringPrefix + "RO"
-    }
-    override def drop( from: Int): MutableProjection[A] = slice(from, length)
-    override def take(until: Int): MutableProjection[A] = slice(0, until)
-    override def slice(from0: Int, until0: Int) : MutableProjection[A] = new MutableSlice[A] {
-      def from = from0
-      def until = until0
-      def underlying = Mutable.this
-    }
-    override def reverse : MutableProjection[A] = new MutableProjection[A] {
-      def update(idx: Int, what: A) { Mutable.this.update(length - idx - 1, what) }
-      def length = Mutable.this.length
-      def apply(idx: Int) = Mutable.this.apply(length - idx - 1)
-      override def stringPrefix = Mutable.this.stringPrefix + "R"
-      override def reverse: MutableProjection[A] = Mutable.this.projection
-    }
-  }
-  trait MutableProjection[A] extends Projection[A] with Mutable[A] {
-    override def force : Mutable[A] = toArray
-    override def projection : MutableProjection[A] = this
-  }
-  private[scala] trait MutableSlice[A] extends MutableProjection[A] with Slice[A] {
-    protected def underlying : Mutable[A]
-    override def slice(from0 : Int, until0 : Int) = {
-      val from = (if (this.from < 0) 0 else this.from)
-      underlying.slice(from + from0, from + until0)
-    }
-    override def update(idx : Int, what : A) : Unit = {
-      val from = (if (this.from < 0) 0 else this.from)
-      if (idx < 0 || idx >= length) throw new Predef.IndexOutOfBoundsException
-      else underlying.update(from + idx, what)
-    }
-  }
-}
-
-/** Sequences that support O(1) element access and O(1) length computation.
- *  @author Sean McDirmid
- */
-trait RandomAccessSeq[+A] extends Seq[A] {
-  override def projection : RandomAccessSeq.Projection[A] = new RandomAccessSeq.Projection[A] {
-    def length = RandomAccessSeq.this.length
-    def apply(idx : Int) = RandomAccessSeq.this.apply(idx)
-    override def elements = RandomAccessSeq.this.elements
-    override def stringPrefix = RandomAccessSeq.this.stringPrefix + "P"
-  }
-  override def elements : Iterator[A] = new BufferedIterator.Advanced[A] {
-    var idx = 0
-    override def peekList(sz : Int) = new RandomAccessSeq[A] {
-      override def length = RandomAccessSeq.this.length - idx
-      override def apply(jdx : Int) = RandomAccessSeq.this.apply(jdx + idx)
-    }
-    override def hasNext = idx < RandomAccessSeq.this.length
-    def next = {
-      if (!hasNext) throw new Predef.NoSuchElementException
-      val ret = RandomAccessSeq.this.apply(idx)
-      idx += 1
-      ret
-    }
-  }
-  override def drop( from: Int): RandomAccessSeq[A] = slice(from, length)
-  override def take(until: Int): RandomAccessSeq[A] = slice(0, until)
-  override def slice(from0 : Int, until0 : Int) : RandomAccessSeq[A] = new RandomAccessSeq.Slice[A] {
-    def from = from0
-    def until = until0
-    def underlying = RandomAccessSeq.this
-  }
-  override def reverse : Seq[A] = new RandomAccessSeq.Projection[A] {
-    def length = RandomAccessSeq.this.length
-    def apply(idx : Int) = RandomAccessSeq.this.apply(length - idx - 1)
-    override def stringPrefix = RandomAccessSeq.this.stringPrefix + "R"
-    override def reverse : RandomAccessSeq.Projection[A] = RandomAccessSeq.this.projection
-  }
-
-  /** Partitions this random access sequence in two random access
-   *  sequences according to a predicate.
-   *
-   *  @param p the predicate on which to partition
-   *  @return  a pair of random access sequences: the sequence of all elements
-   *           that satisfy the predicate <code>p</code> and the sequence of
-   *           all elements that do not.
-   *           The relative order of the elements in the resulting sequences
-   *           is the same as in the original sequence.
-   */
-  override def partition(p: A => Boolean): (RandomAccessSeq[A], RandomAccessSeq[A]) = {
-    val matched = new ArrayBuffer[A]
-    val failed = new ArrayBuffer[A]
-    val elems = elements
-    while (elems.hasNext) { val x = elems.next; if (p(x)) matched += x else failed += x }
-    (matched, failed)
-  }
-
-  /** insert segment <code>patch</code> into this sequence at <code>from</code>
-   *  replacing  <code>replaced</code> elements. The result is a projection.
-   */
-  def patch[B >: A](from0: Int, patch0: RandomAccessSeq[B], replaced0: Int): RandomAccessSeq.Projection[B] = new RandomAccessSeq.Patch[B] {
-    override def original = RandomAccessSeq.this
-    override def from = from0
-    override def patch = patch0
-    override def replaced = replaced0
-    override def stringPrefix = RandomAccessSeq.this.stringPrefix + "P"
-  }
-
-  override def ++[B >: A](that: Iterable[B]): RandomAccessSeq[B] = that match {
-    case that: RandomAccessSeq[b] =>
-      val ret = new Array[B](length + that.length)
-      copyToArray(ret, 0)
-      (that : RandomAccessSeq[B]).copyToArray(ret, length)
-      ret
-    case that =>
-      val buf = new scala.collection.mutable.ArrayBuffer[B]
-      this copyToBuffer buf
-      that copyToBuffer buf
-      buf.readOnly
-  }
-
-  override def toStream : Stream[A] = new Stream.Definite[A] {
-    override def isEmpty = RandomAccessSeq.this.isEmpty
-    override def head = RandomAccessSeq.this.apply(0)
-    override def tail = RandomAccessSeq.this.drop(1).toStream
-    protected def addDefinedElems(buf: StringBuilder, prefix: String): StringBuilder = {
-      var prefix0 = prefix
-      var buf0 = buf
-      elements.foreach{e =>
-        buf0 = buf0.append(prefix0).append(e)
-        prefix0 = ", "
-      }
-      buf0
-    }
-  }
-
-  /** will return false if index is out of bounds */
-  final def safeIs(idx : Int, a : Any) = if (idx >= 0 && idx < length) this(idx) == a else false
-
-}
diff --git a/src/library/scala/RandomAccessSeqProxy.scala b/src/library/scala/RandomAccessSeqProxy.scala
deleted file mode 100644
index 2db37cd5c3..0000000000
--- a/src/library/scala/RandomAccessSeqProxy.scala
+++ /dev/null
@@ -1,37 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-/** This class implements a proxy for random access sequences. It forwards
- *  all calls to a different sequence object.
- *
- *  @author  Stepan Koltsov
- *  @version 1.0, 27/06/2008
- */
-trait RandomAccessSeqProxy[+A] extends RandomAccessSeq[A] with SeqProxy[A] {
-  override def self: RandomAccessSeq[A]
-
-  override def projection = self.projection
-
-  override def drop(from: Int): RandomAccessSeq[A] = self.drop(from)
-  override def take(until: Int): RandomAccessSeq[A] = self.take(until)
-  override def slice(from: Int, until: Int) : RandomAccessSeq[A] = self.slice(from, until)
-  override def reverse = self.reverse
-  override def partition(p: A => Boolean): (RandomAccessSeq[A], RandomAccessSeq[A]) =
-    self.partition(p)
-  override def patch[B >: A](from0: Int, patch0: RandomAccessSeq[B], replaced0: Int) =
-    self.patch(from0, patch0, replaced0)
-  override def ++[B >: A](that: Iterable[B]): RandomAccessSeq[B] = self ++ that
-  override def toStream: Stream[A] = self.toStream
-}
-
-// vim: set ts=2 sw=2 et:
diff --git a/src/library/scala/Range.scala b/src/library/scala/Range.scala
index fcf8c809ad..c78f0718f3 100644
--- a/src/library/scala/Range.scala
+++ b/src/library/scala/Range.scala
@@ -11,7 +11,8 @@
 
 package scala
 
-import Predef._
+import collection.immutable.Vector
+import collection.generic.VectorView
 
 /** <p>
  *    The <code>Range</code> class represents integer values in range
@@ -24,11 +25,13 @@ import Predef._
  *     println(r2.length) // = 5
  *  </pre>
  *
- *  @author  Stephane Micheloud
- *  @version 1.0, 01/05/2007
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-class Range(val start: Int, val end: Int, val step: Int) extends RandomAccessSeq.Projection[Int] {
-  if (step == 0) throw new Predef.IllegalArgumentException
+class Range(val start: Int, val end: Int, val step: Int) extends VectorView[Int, Vector[Int]] {
+  require(step != 0)
+
+  protected def underlying = Vector.empty[Int]
 
   /** Create a new range with the start and end values of this range and
    *  a new <code>step</code>.
@@ -36,19 +39,14 @@ class Range(val start: Int, val end: Int, val step: Int) extends RandomAccessSeq
   def by(step: Int): Range = new Range(start, end, step)
 
   override def foreach(f: Int => Unit) {
+    var i = start
     if (step > 0) {
-      var i = this.start
-      val until = if (inInterval(end)) end + 1 else end
-
-      while (i < until) {
+      while (i < end) {
         f(i)
         i += step
       }
     } else {
-      var i = this.start
-      val until = if (inInterval(end)) end - 1 else end
-
-      while (i > until) {
+      while (i > end) {
         f(i)
         i += step
       }
@@ -56,54 +54,33 @@ class Range(val start: Int, val end: Int, val step: Int) extends RandomAccessSeq
   }
 
   lazy val length: Int = {
-    if (start < end && this.step < 0) 0
-    else if (start > end && this.step > 0) 0
-    else {
-      val base = if (start < end) end - start
-                 else start - end
-      assert(base >= 0)
-      val step = if (this.step < 0) -this.step else this.step
-      assert(step >= 0)
-      base / step + last(base, step)
-    }
+    def plen(start: Int, end: Int, step: Int) =
+      if (end <= start) 0 else (end - start - 1) / step + 1
+    if (step > 0) plen(start, end, step)
+    else plen(end, start, -step)
   }
 
-  protected def last(base: Int, step: Int): Int =
-    if (base % step != 0) 1 else 0
-
   def apply(idx: Int): Int = {
-    if (idx < 0 || idx >= length) throw new Predef.IndexOutOfBoundsException
-    start + (step * idx)
-  }
-
-  /** a <code>Seq.contains</code>, not a <code>Iterator.contains</code>! */
-  def contains(x: Int): Boolean = {
-    inInterval(x) && (((x - start) % step) == 0)
+    if (idx < 0 || idx >= length) throw new IndexOutOfBoundsException(idx.toString)
+    start + idx * step
   }
 
-  /** Is the argument inside the interval defined by `start' and `end'?
-   *  Returns true if `x' is inside [start, end).
-   */
-  protected def inInterval(x: Int): Boolean =
-    if (step > 0)
-      (x >= start && x < end)
-    else
-      (x <= start && x > end)
+  def contains(x: Int): Boolean =
+    if (step > 0) start <= x && x < end
+    else start >= x && x > end
 
-  def inclusive = new Range.Inclusive(start,end,step)
+  def inclusive = Range.inclusive(start, end, step)
 }
-
 object Range {
-  class Inclusive(start: Int, end: Int, step: Int) extends Range(start, end, step) {
-    override def apply(idx: Int): Int = super.apply(idx)
-    override protected def last(base: Int, step: Int): Int = 1
-    override def by(step: Int): Range = new Inclusive(start, end, step)
-
-    /** Returns true if x is inside the interval [start, end]. */
-    override protected def inInterval(x: Int) =
-      if (step > 0)
-        (x >= start && x <= end)
-      else
-        (x <= start && x >= end)
+  /** @deprecated use Range.inclusive instead */
+  class Inclusive(start: Int, end0: Int, step: Int)
+      extends Range(start, if (step > 0) end0 + 1 else end0 - 1, step) { self =>
+    override def by(step: Int): Range = new Inclusive(start, end0, step)
   }
+
+  def apply(start: Int, end: Int, step: Int) =
+    new Range(start, end, step)
+
+  def inclusive(start: Int, end: Int, step: Int): Range =
+    new Range.Inclusive(start, end, step)
 }
diff --git a/src/library/scala/Seq.scala b/src/library/scala/Seq.scala
deleted file mode 100644
index 656d3b6fab..0000000000
--- a/src/library/scala/Seq.scala
+++ /dev/null
@@ -1,515 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import Predef._
-import collection.mutable.ArrayBuffer
-
-object Seq {
-
-  /** The empty sequence */
-  val empty : Seq[Nothing] = RandomAccessSeq.empty
-
-  /** This method is called in a pattern match { case Seq(...) => }.
-   *
-   *  @param x the selector value
-   *  @return  sequence wrapped in an option, if this is a Seq, otherwise none
-   */
-  def unapplySeq[A](x: Seq[A]): Some[Seq[A]] = Some(x)
-
-  /** Create read only sequence of specified elements */
-  def apply[A](xs: A*): Seq[A] = RandomAccessSeq(xs: _*)
-
-  case class singleton[A](value: A) extends RandomAccessSeq[A] {
-    override def length = 1
-    override def isDefinedAt(idx: Int): Boolean = idx == 0
-    override def apply(idx: Int) = idx match {
-      case 0 => value
-      case _ => throw new Predef.IndexOutOfBoundsException
-    }
-  }
-
-  /** Builds a singleton sequence.
-   *
-   * @deprecated use <code>singleton</code> instead.
-   */
-  @deprecated def single[A](x: A) = singleton(x)
-
-  trait Projection[+A] extends Seq[A] with Iterable.Projection[A]  {
-    override def projection = this
-    override def force : Seq[A] = toList
-
-    override def map[B](f: A => B) : Projection[B] = new MapProjection(f)
-    protected class MapProjection[B](f : A => B) extends Projection[B] {
-      def length = Projection.this.length
-      def elements = Projection.this.elements.map(f)
-      def apply(idx : Int) = f(Projection.this.apply(idx))
-      override def stringPrefix = Projection.this.stringPrefix + "M"
-    }
-    override def flatMap[B](f: A => Iterable[B]): Projection[B] = new Projection[B] {
-      override def stringPrefix = Projection.this.stringPrefix + "G"
-      def elements = Projection.this.elements.flatMap(a => f(a).elements)
-      def length = {
-        var sz = 0
-        Projection.this.foreach(a => sz = sz + f(a).asInstanceOf[Collection[B]].size)
-        sz
-      }
-      def apply(idx : Int) : B = {
-        var jdx = 0
-        Projection.this.foreach(a => {
-          val i = f(a)
-          val length = i.asInstanceOf[Collection[B]].size
-          if (idx < jdx + length) {
-            val j = i.elements
-            while (jdx < idx) {
-              j.next; jdx += 1
-            }
-            return j.next
-          } else jdx += length
-        })
-        throw new IndexOutOfBoundsException
-      }
-    }
-    override def append[B >: A](that: => Iterable[B]): Projection[B] = that match {
-      case that: Seq[b] => new Projection[B] {
-          def length = Projection.this.length + that.length
-          def elements : Iterator[B] = Projection.this.elements ++ (that.elements:Iterator[B])
-          def apply(idx : Int) =
-            if (idx < Projection.this.length) Projection.this(idx)
-            else that(idx - Projection.this.length)
-        }
-      case that =>
-        (this ++ that).projection // sucks but no other option.
-    }
-
-    protected abstract class ComputeSize[B] extends Projection[B] {
-      def apply(idx: Int): B = {
-        var sz = 0
-        val i = elements
-        while (i.hasNext) {
-          val ret = i.next
-          if (sz == idx) return ret
-          sz += 1
-        }
-        throw new Predef.IndexOutOfBoundsException
-      }
-      override def length: Int = {
-        val i = elements
-        var sz = 0
-        while (i.hasNext) {
-          sz += 1
-          i.next
-        }
-        sz
-      }
-    }
-    override def takeWhile(p: A => Boolean): Projection[A] = new ComputeSize[A] {
-      override def stringPrefix = Projection.this.stringPrefix + "TW"
-      override def elements = Projection.this.elements.takeWhile(p)
-    }
-    override def filter(p : A => Boolean) : Projection[A] = new ComputeSize[A] {
-      override def stringPrefix = Projection.this.stringPrefix + "F"
-      override def elements = Projection.this.elements.filter(p)
-    }
-  }
-}
-
-
-/** Class <code>Seq[A]</code> represents finite sequences of elements
- *  of type <code>A</code>.
- *
- *  @author  Martin Odersky
- *  @author  Matthias Zenger
- *  @version 1.0, 16/07/2003
- */
-trait Seq[+A] extends AnyRef with PartialFunction[Int, A] with Collection[A] {
-
-  /** Returns the length of the sequence.
-   *
-   *  @return the sequence length.
-   */
-  def length: Int
-
-  /** Result of comparing <code>length</code> with operand <code>l</code>.
-   *  returns <code>x</code> where
-   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; l</code>
-   *  <code>x == 0</code>   iff    <code>this.length == l</code>
-   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; that</code>.
-   *
-   *  This method is used by matching streams against right-ignoring (...,_*) patterns.
-   *  Lazy sequences should override this method if length forces evaluation of the stream.
-   */
-  def lengthCompare(l: Int): Int = length - l
-
-  /** should always be <code>length</code> */
-  def size = length
-
-  /** Returns true if length == 0
-   */
-  override def isEmpty: Boolean = { length == 0 }
-
-  /** Appends two iterable objects.
-   *
-   *  @return     the new iterable object
-   *  @deprecated use <code>++</code> instead
-   */
-  @deprecated
-  override def concat [B >: A](that: Iterable[B]): Seq[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf.readOnly
-  }
-
-  /** Returns the last element of this list.
-   *
-   *  @return the last element of the list.
-   *  @throws Predef.NoSuchElementException if the list is empty.
-   */
-  def last: A = length match {
-    case 0 => throw new Predef.NoSuchElementException
-    case n => this(n - 1)
-  }
-
-  /** Returns as an option the last element of this list or
-   *  <code>None</code> if list is empty.
-   *
-   *  @return the last element as an option.
-   */
-  def lastOption: Option[A] = length match {
-    case 0 => None
-    case n => Some(this(n-1))
-  }
-
-  /** Returns the first element of this list.
-   *
-   *  @return the first element of the list.
-   *  @throws Predef.UnsupportedOperationException if the list is empty.
-   */
-  def first: A =
-    if (isEmpty) throw new Predef.NoSuchElementException
-    else this(0)
-
-  /** Returns as an option the first element of this list or
-   *  <code>None</code> if list is empty.
-   *
-   *  @return the first element as an option.
-   */
-  def firstOption: Option[A] = if (isEmpty) None else Some(apply(0))
-
-  @deprecated
-  def headOption: Option[A] = firstOption
-
-  /** Appends two iterable objects.
-   */
-  override def ++ [B >: A](that: Iterable[B]): Seq[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf.readOnly
-  }
-
-  /** Is this partial function defined for the index <code>x</code>?
-   *
-   *  @param x ..
-   *  @return  <code>true</code>, iff <code>x</code> is a legal sequence index.
-   */
-  def isDefinedAt(x: Int): Boolean = (x >= 0) && (x < length)
-
-  /** Returns the index of the last occurence of the specified element
-   *  in this sequence, or -1 if the sequence does not contain this element.
-   *
-   *  @param  elem   element to search for.
-   *  @return the index in this sequence of the last occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   */
-  def lastIndexOf[B >: A](elem: B): Int = {
-    var i = length
-    var found = false
-    while (!found && (i > 0)) {
-      i -= 1
-      if (this(i) == elem) found = true
-    }
-    if (found) i else -1
-  }
-
-  /** Returns index of the first element satisying a predicate, or -1.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @return   the index of the first element satisfying <code>p</code>,
-   *            or -1 if such an element does not exist
-   */
-  override def findIndexOf(p: A => Boolean): Int =
-    elements.findIndexOf(p)
-
-  /** Returns the index of the first occurence of the specified
-   *  object in this iterable object.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  elem  element to search for.
-   *  @return the index in this sequence of the first occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   */
-  override def indexOf[B >: A](elem: B): Int =
-    elements.indexOf(elem)
-
-  /** Returns the sequence resulting from applying the given function
-   *  <code>f</code> to each element of this sequence.
-   *
-   *  @param f function to apply to each element.
-   *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
-   *           sequence is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  override def map[B](f: A => B): Seq[B] = {
-    // todo: malformed scala signature suing build when replaced by
-    // super.map(f).asInstanceOf[Seq[B2]]
-    val buf = new ArrayBuffer[B]
-    val elems = elements
-    while (elems.hasNext) buf += f(elems.next)
-    buf.readOnly
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this sequence, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this sequence is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  override def flatMap[B](f: A => Iterable[B]): Seq[B] = {
-    val buf = new ArrayBuffer[B]
-    val elems = elements
-    while (elems.hasNext) f(elems.next) copyToBuffer buf
-    buf.readOnly
-  }
-
-  /** Returns all the elements of this sequence that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *
-   *  @param p the predicate used to filter the list.
-   *  @return the elements of this list satisfying <code>p</code>.
-   */
-  override def filter(p: A => Boolean): Seq[A] =
-    super.filter(p).asInstanceOf[Seq[A]]
-
-  /** Returns a sequence consisting only over the first <code>n</code>
-   *  elements of this sequence, or else the whole sequence, if it has less
-   *  than <code>n</code> elements. (non-strict)
-   *
-   *  @param n the number of elements to take
-   *  @return a possibly projected sequence
-   */
-  override def take(n: Int): Seq[A] = {
-    var m = 0
-    val result = new scala.collection.mutable.ListBuffer[A]
-    val i = elements
-    while (m < n && i.hasNext) {
-      result += i.next; m += 1
-    }
-    result.toList
-  }
-
-
-  /** Returns this sequence without its <code>n</code> first elements
-   *  If this sequence has less than <code>n</code> elements, the empty
-   *  sequence is returned. (non-strict)
-   *
-   *  @param n the number of elements to drop
-   *  @return  the new sequence
-   */
-  override def drop(n: Int): Seq[A] = {
-    import scala.collection.mutable.ListBuffer
-    var m = 0
-    val result = new ListBuffer[A]
-    val i = elements
-    while (m < n && i.hasNext) {
-      i.next; m += 1
-    }
-    while (i.hasNext) result += i.next
-    result.toList
-  }
-
-   /** A sub-sequence starting at index <code>from</code>
-    *  and ending (non-inclusive) at index <code>until</code> (non-strict)
-    *
-    *  @param from   The index of the first element of the slice
-    *  @param until    The index of the element following the slice
-    *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-    *          or <code>length &lt; from + len<code>
-    */
-  def slice(from: Int, until: Int): Seq[A] = drop(from).take(until - from)
-
-   /** A sub-sequence starting at index <code>from</code>
-    *  and extending up to the length of the current sequence (non-strict)
-    *
-    *  @param from   The index of the first element of the slice
-    *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-    *  @deprecated Use <code>drop(n: Int): Seq[A]</code> instead.
-    */
- @deprecated def slice(from: Int): Seq[A] = slice(from, length)
-
-  /** Returns the longest prefix of this sequence whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest prefix of this sequence whose elements satisfy
-   *           the predicate <code>p</code>.
-   */
-  override def takeWhile(p: A => Boolean): Seq[A] =
-    super.takeWhile(p).asInstanceOf[Seq[A]]
-
-  /** Returns the longest suffix of this sequence whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest suffix of the sequence whose first element
-   *           does not satisfy the predicate <code>p</code>.
-   */
-  override def dropWhile(p: A => Boolean): Seq[A] =
-    super.dropWhile(p).asInstanceOf[Seq[A]]
-
-  /** A sequence consisting of all elements of this sequence in reverse order.
-   */
-  def reverse: Seq[A] = {
-    var result: List[A] = Nil
-    val elems = elements
-    while (elems.hasNext) result = elems.next :: result
-    result
-  }
-
-  /** Tests if the given value <code>elem</code> is a member of this
-   *  sequence.
-   *
-   *  @param elem element whose membership has to be tested.
-   *  @return     <code>true</code> iff there is an element of this sequence
-   *              which is equal (w.r.t. <code>==</code>) to <code>elem</code>.
-   */
-  def contains(elem: Any): Boolean = exists (_ == elem)
-
-  /** Returns a subsequence starting from index <code>from</code>
-   *  consisting of <code>len</code> elements.
-   *
-   *  @deprecated use <code>slice</code> instead
-   */
-  @deprecated
-  def subseq(from: Int, end: Int): Seq[A] = slice(from, end - from)
-
-  /** Converts this sequence to a fresh Array with <code>length</code> elements.
-   */
-  override def toArray[B >: A]: Array[B] = {
-    val result = new Array[B](length)
-    copyToArray(result, 0)
-    result
-  }
-
-  /**
-   *  Overridden for efficiency.
-   *
-   *  @return  the sequence itself
-   */
-  override def toSeq: Seq[A] = this
-
-  override def projection: Seq.Projection[A] = new Seq.Projection[A] {
-    override def force: Seq[A] = Seq.this
-    def elements = Seq.this.elements
-    def length = Seq.this.length
-    def apply(idx: Int) = Seq.this.apply(idx)
-    override def stringPrefix = Seq.this.stringPrefix + "P"
-  }
-
-  def equalsWith[B](that: Seq[B])(f: (A,B) => Boolean): Boolean =
-    if (size != that.size) false
-    else {
-      val i = elements
-      val j = that.elements
-      while (i.hasNext) if (!f(i.next, j.next)) return false
-      true
-    }
-
-  /**
-   * Checks whether the argument sequence is contained at the
-   * specified index within the receiver object.
-   *
-   * If the both the receiver object, <code>this</code> and
-   * the argument, <code>that</code> are infinite sequences
-   * this method may not terminate.
-   *
-   * @return true if <code>that</code> is contained in
-   * <code>this</code>, at the specified index, otherwise false
-   *
-   * @see String.startsWith
-   */
-  def startsWith[B](that: Seq[B], offset: Int): Boolean = {
-    val i = elements.drop(offset)
-    val j = that.elements
-    var result = true
-    while (j.hasNext && i.hasNext && result)
-      result = i.next == j.next
-    result && !j.hasNext
-  }
-
-  /**
-   * Check whether the receiver object starts with the argument sequence.
-   *
-   * @return true if <code>that</code> is a prefix of <code>this</code>,
-   * otherwise false
-   *
-   * @see Seq.startsWith
-   */
-  def startsWith[B](that: Seq[B]): Boolean = startsWith(that, 0)
-
-
-  /** @return true if this sequence end with that sequence
-   *  @see String.endsWith
-   */
-  def endsWith[B](that: Seq[B]): Boolean =
-    drop(length - that.length).sameElements(that)
-
-  /**
-   * Searches for the argument sequence in the receiver object, returning
-   * the smallest index where a match occurs.
-   *
-   * If the receiver object, <code>this</code>, is an infinite sequence
-   * this method will not terminate if there is no match.  Similarly, if
-   * the both the receiver object and the argument, <code>that</code> are
-   * infinite sequences this method will not terminate.
-   *
-   * Because both the receiver object and the argument can both potentially
-   * be an infinite sequences, we do not attempt to use an optimized
-   * searching algorithm.  Therefore, the running time will be proportional
-   * to the length of the receiver object and the argument.  Subclasses and
-   * traits can potentially provide an optimized implementation.
-   *
-   * @return -1 if <code>that</code> not contained in <code>this</code>,
-   * otherwise the smallest index where <code>that</code> is found.
-   *
-   * @see String.indexOf
-   */
-  def indexOf[B >: A](that: Seq[B]): Int = {
-    val e = this.elements
-    // Offset into e
-    var i = 0
-    if (that.isEmpty) return 0
-    while (e.hasNext) {
-      if (this.startsWith(that, i)) return i
-      e.next; i += 1
-    }
-    -1
-  }
-
-  /** Is <code>that</code> a slice in this?
-   */
-  def containsSlice[B](that: Seq[B]): Boolean = indexOf(that) != -1
-}
diff --git a/src/library/scala/SeqProxy.scala b/src/library/scala/SeqProxy.scala
deleted file mode 100644
index 915211b2e9..0000000000
--- a/src/library/scala/SeqProxy.scala
+++ /dev/null
@@ -1,87 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-
-/** This class implements a proxy for sequences. It forwards
- *  all calls to a different sequence object.
- *
- *  @author  Martin Odersky
- *  @author  Matthias Zenger
- *  @version 2.0, 31/12/2006
- */
-trait SeqProxy[+A] extends Seq[A] with CollectionProxy[A] {
-
-  override def self: Seq[A]
-
-  // PartialFunction delegates
-
-  override def apply(i: Int): A = self(i)
-
-  // Seq delegates
-  // Seq methods could be printed by  cat Seq.scala | sed -n '/trait Seq/,$ p' | egrep '^  (override )?def'
-
-  override def length: Int = self.length
-  override def lengthCompare(l: Int) = self lengthCompare l
-  override def size = self.size
-  override def isEmpty = self.isEmpty
-  @deprecated
-  override def concat [B >: A](that: Iterable[B]): Seq[B] = self concat that
-  override def last = self.last
-  override def lastOption = self.lastOption
-  override def first = self.first
-  override def firstOption = self.firstOption
-  @deprecated
-  override def headOption = firstOption
-
-  override def ++ [B >: A](that: Iterable[B]) = self ++ that
-  override def isDefinedAt(x: Int): Boolean = self isDefinedAt x
-
-  override def lastIndexOf[B >: A](elem: B): Int = self lastIndexOf elem
-  override def findIndexOf(p: A => Boolean): Int = self findIndexOf p
-
-  override def indexOf[B >: A](elem: B): Int = self indexOf elem
-
-  override def map[B](f: A => B): Seq[B] = self map f
-  override def flatMap[B](f: A => Iterable[B]) = self flatMap f
-  override def filter(p: A => Boolean): Seq[A] = self filter p
-  override def take(n: Int): Seq[A] = self take n
-  override def drop(n: Int): Seq[A] = self drop n
-
-  override def slice(from: Int, len: Int): Seq[A] = self.slice(from, len)
-  @deprecated
-  override def slice(from: Int) = slice(from, length)
-
-  override def takeWhile(p: A => Boolean): Seq[A] = self takeWhile p
-  override def dropWhile(p: A => Boolean): Seq[A] = self dropWhile p
-
-  override def reverse: Seq[A] = self.reverse
-
-  override def contains(elem: Any): Boolean = self contains elem
-  @deprecated
-  override def subseq(from: Int, end: Int) = slice(from, end - from)
-
-  override def toArray[B >: A]: Array[B] = self.toArray
-
-  override def toSeq = self.toSeq
-
-  override def projection = self.projection
-
-  override def equalsWith[B](that: Seq[B])(f: (A, B) => Boolean): Boolean = self.equalsWith(that)(f)
-
-  override def startsWith[B](that: Seq[B]) = self startsWith that
-  override def endsWith[B](that: Seq[B]) = self endsWith that
-
-  override def indexOf[B >: A](that: Seq[B]) = self indexOf that
-
-  override def containsSlice[B](that: Seq[B]) = self containsSlice that
-}
diff --git a/src/library/scala/Stream.scala b/src/library/scala/Stream.scala
deleted file mode 100644
index f3300c4afe..0000000000
--- a/src/library/scala/Stream.scala
+++ /dev/null
@@ -1,518 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import Predef._
-
-/**
- * The object <code>Stream</code> provides helper functions
- * to manipulate streams.
- *
- * @author Martin Odersky, Matthias Zenger
- * @version 1.1 08/08/03
- */
-object Stream {
-
-  def apply[A](xs: A*) = (xs :\ (empty: Stream[A]))(cons(_, _))
-
-  def unapplySeq[A](xs: Stream[A]): Option[Seq[A]] = Some(xs)
-
-  object lazy_:: {
-    def unapply[A](xs: Stream[A]): Option[(A, Stream[A])] =
-      if (xs.isEmpty) None
-      else Some(xs.head, xs.tail)
-  }
-
-   /** a stream with a definite size */
-  trait Definite[+A] extends Stream[A] with Function0[Stream[A]] {
-     override def hasDefiniteSize = true
-     override def apply = this
-
-    /** Converts stream to string. Redefined here as
-     *  super[Stream].toString does not pass because of an implementation
-     *  restriction (super[C] cannot be called when C is a class).
-     */
-    override def toString =
-      "Stream(" + addDefinedElems(new StringBuilder(), "") + ")"
-   }
-
-  /** The empty stream */
-  val empty: Stream[Nothing] = new Definite[Nothing] {
-    override def isEmpty = true
-    def head: Nothing = throw new NoSuchElementException("head of empty stream")
-    def tail: Stream[Nothing] = throw new UnsupportedOperationException("tail of empty stream")
-    protected def addDefinedElems(buf: StringBuilder, prefix: String): StringBuilder = buf
-  }
-
-  object cons {
-
-    /** A stream consisting of a given first element and remaining elements
-     *  @param hd   The first element of the result stream
-     *  @param tl   The remaining elements of the result stream
-     */
-    def apply[A](hd: A, tl: => Stream[A]) = new Stream[A] {
-      override def hasDefiniteSize = if (tlDefined) tlVal.hasDefiniteSize else super.hasDefiniteSize
-      override def isEmpty = false
-      def head = hd
-      private var tlVal: Stream[A] = _
-      private def tlDefined = tlVal ne null
-      def tail: Stream[A] = {
-        if (!tlDefined) { tlVal = tl }
-        tlVal
-      }
-      protected def addDefinedElems(buf: StringBuilder, prefix: String): StringBuilder = {
-        val buf1 = buf.append(prefix).append(hd)
-        if (tlDefined) tlVal.addDefinedElems(buf1, ", ") else buf1 append ", ?"
-      }
-    }
-
-    def unapply[A](str: Stream[A]): Option[(A, Stream[A])] =
-      if(str.isEmpty)
-        None
-      else
-        Some((str.head, str.tail))
-  }
-
-  /** A stream containing all elements of a given iterator, in the order they are produced.
-   *  @param it   The iterator producing the stream's elements
-   */
-  def fromIterator[A](it: Iterator[A]): Stream[A] =
-    if (it.hasNext) cons(it.next, fromIterator(it)) else empty
-
-  /** The concatenation of a sequence of streams
-   */
-  def concat[A](xs: Iterable[Stream[A]]): Stream[A] = concat(xs.elements)
-
-  /** The concatenation of all given streams
-   */
-  def concat[A](s1: Stream[A], s2: Stream[A], ss: Stream[A]*): Stream[A] =
-    s1 append s2 append concat(ss.elements)
-
-  /** The concatenation of all streams returned by an iterator
-   */
-  def concat[A](xs: Iterator[Stream[A]]): Stream[A] =
-    if (xs.hasNext) xs.next append concat(xs)
-    else empty
-
-  /**
-   * Create a stream with element values
-   * <code>v<sub>n+1</sub> = v<sub>n</sub> + 1</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and <code>v<sub>i</sub> &lt; end</code>.
-   *
-   * @param start the start value of the stream
-   * @param end the end value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  def range(start: Int, end: Int): Stream[Int] =
-    range(start, end, 1)
-
-  /**
-   * Create a stream with element values
-   * <code>v<sub>n+1</sub> = v<sub>n</sub> + step</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and elements are in the range between <code>start</code> (inclusive)
-   * and <code>end</code> (exclusive)
-   *
-   * @param start the start value of the stream
-   * @param end the end value of the stream
-   * @param step the increment value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  final def range(start: Int, end: Int, step: Int): Stream[Int] = {
-    if ((step <= 0 || start < end) && (step >= 0 || start > end))
-      cons(start, range(start + step, end, step))
-    else
-      empty
-  }
-
-  /**
-   * Create a stream with element values
-   * <code>v<sub>n+1</sub> = step(v<sub>n</sub>)</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and elements are in the range between <code>start</code> (inclusive)
-   * and <code>end</code> (exclusive)
-   *
-   * @param start the start value of the stream
-   * @param end the end value of the stream
-   * @param step the increment function of the stream, must be monotonically increasing or decreasing
-   * @return the stream starting at value <code>start</code>.
-   */
-  def range(start: Int, end: Int, step: Int => Int): Stream[Int] = {
-    val up = step(start) > start
-    val down = step(start) < start
-    def loop(lo: Int): Stream[Int] =
-      if ((!up || lo < end) && (!down || lo > end)) cons(lo, loop(step(lo)))
-      else empty
-    loop(start)
-  }
-
-  /**
-   * Create an infinite stream starting at <code>start</code>
-   * and incrementing by step <code>step</code>
-   *
-   * @param start the start value of the stream
-   * @param step the increment value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  def from(start: Int, step: Int): Stream[Int] =
-    cons(start, from(start+step, step))
-
-  /**
-   * Create an infinite stream starting at <code>start</code>
-   * and incrementing by 1.
-   *
-   * @param start the start value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  def from(start: Int): Stream[Int] = from(start, 1)
-
-  /**
-   * Create an infinite stream containing the given element.
-   *
-   * @param elem the element composing the resulting stream
-   * @return the stream containing an inifinite number of elem
-   */
-  def const[A](elem: A): Stream[A] = cons(elem, const(elem))
-
-  /** Create a stream containing several copies of an element.
-   *
-   *  @param n    the length of the resulting stream
-   *  @param elem the element composing the resulting stream
-   *  @return     the stream composed of n elements all equal to elem
-   */
-  def make[A](n: Int, elem: A): Stream[A] =
-    Stream.const(elem) take n
-}
-
-/**
- * <p>The class <code>Stream</code> implements lazy lists where elements
- * are only evaluated when they are needed. Here is an example:</p>
- * <pre>
- * <b>object</b> Main <b>extends</b> Application {
- *
- *   <b>def</b> from(n: Int): Stream[Int] =
- *     Stream.cons(n, from(n + 1))
- *
- *   <b>def</b> sieve(s: Stream[Int]): Stream[Int] =
- *     Stream.cons(s.head, sieve(s.tail filter { _ % s.head != 0 }))
- *
- *   <b>def</b> primes = sieve(from(2))
- *
- *   primes take 10 print
- * }
- * </pre>
- *
- * @author Martin Odersky, Matthias Zenger
- * @version 1.1 08/08/03
- */
-abstract class Stream[+A] extends Seq.Projection[A] {
-
-  /** is this stream empty? */
-  override def isEmpty: Boolean
-
-  override def force : List[A] = toList
-
-  /** The first element of this stream
-   *  @throws Predef.NoSuchElementException if the stream is empty.
-   */
-  def head: A
-
-  /** A stream consisting of the remaining elements of this stream after the first one.
-   *  @throws Predef.UnsupportedOperationException if the stream is empty.
-   */
-  def tail: Stream[A]
-
-  /** The length of this stream */
-  override def length: Int = {
-    var len = 0
-    var here = this
-    while (!here.isEmpty) {
-      len += 1
-      here = here.tail
-    }
-    len
-  }
-
-  /** Result of comparing <code>length</code> with operand <code>l</code>.
-   *  returns <code>x</code> where
-   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; l</code>
-   *  <code>x == 0</code>   iff    <code>this.length == l</code>
-   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; that</code>.
-   *
-   *  This method is used by matching streams against right-ignoring (...,_*) patterns.
-   *
-   *  This method does not call <code>Stream.length</code>, it works for <code>O(l)</code>,
-   *  not for <code>O(length)</code> and does not force full Stream evaluation.
-   */
-  final override def lengthCompare(l: Int) = {
-    if (isEmpty) 0 - l
-    else if (l <= 0) 1
-    else tail.lengthCompare(l - 1)
-  }
-
-  override def hasDefiniteSize = false
-
-
-  /** The stream resulting from the concatenation of this stream with the argument stream.
-   *  @param rest   The stream that gets appended to this stream
-   */
-  override def append[B >: A](rest: => Iterable[B]): Stream[B] =
-    if (isEmpty) rest.toStream else Stream.cons(head, tail append rest)
-
-
-  /** An iterator returning the elements of this stream one by one.
-   */
-  override def elements: Iterator[A] = new Iterator[A] {
-    var current = Stream.this
-    def hasNext: Boolean = !current.isEmpty
-    def next: A = { val result = current.head; current = current.tail; result }
-  }
-
-  /** The stream without its last element.
-   *  @throws Predef.UnsupportedOperationException if the stream is empty.
-   */
-  def init: Stream[A] =
-    if (isEmpty) throw new UnsupportedOperationException("Stream.empty.init")
-    else if (tail.isEmpty) Stream.empty
-    else Stream.cons(head, tail.init)
-
-  /** Returns the last element of this stream.
-   *
-   *  @return the last element of the stream.
-   *  @throws Predef.NoSuchElementException if the stream is empty.
-   */
-  override final def last: A =
-    if (isEmpty) throw new NoSuchElementException("Stream.empty.last")
-    else
-      if (tail.isEmpty) head else tail.last
-
-  /** Returns the <code>n</code>-th element of this stream. The first element
-   *  (head of the stream) is at position 0.
-   *
-   *  @param n index of the element to return
-   *  @return  the element at position <code>n</code> in this stream.
-   *  @throws Predef.NoSuchElementException if the stream is too short.
-   */
-  override def apply(n: Int): A = drop(n).head
-
-  /** Returns the <code>n</code> first elements of this stream, or else the whole
-   *  stream, if it has less than <code>n</code> elements.
-   *
-   *  @param n the number of elements to take.
-   *  @return the <code>n</code> first elements of this stream.
-   */
-  override def take(n: Int): Stream[A] =
-    if (isEmpty || n <= 0) Stream.empty
-    else Stream.cons(head, if (n == 1) Stream.empty else (tail.take(n-1)))
-
-  /** Returns the stream without its <code>n</code> first elements.
-   *  If the stream has less than <code>n</code> elements, the empty stream is returned.
-   *
-   *  @param n the number of elements to drop.
-   *  @return the stream without its <code>n</code> first elements.
-   */
-  override final def drop(n: Int): Stream[A] = {
-    if (isEmpty || n <= 0) this
-    else tail.drop(n - 1)
-  }
-
-
-  /** Returns the longest prefix of this stream whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest prefix of this stream whose elements satisfy
-   *           the predicate <code>p</code>.
-   */
-  override def takeWhile(p: A => Boolean): Stream[A] =
-    if (isEmpty || !p(head)) Stream.empty
-    else Stream.cons(head, tail takeWhile p)
-
-  /** Returns the longest suffix of this stream whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  the longest suffix of the stream whose first element
-   *           does not satisfy the predicate <code>p</code>.
-   */
-  override final def dropWhile(p: A => Boolean): Stream[A] = {
-    if (isEmpty || !p(head)) this
-    else tail.dropWhile(p)
-  }
-
-  /** Returns the stream resulting from applying the given function <code>f</code> to each
-   *  element of this stream.
-   *
-   *  @param f function to apply to each element.
-   *  @return <code>[f(a0), ..., f(an)]</code> if this stream is <code>[a0, ..., an]</code>.
-   */
-  override def map[B](f: A => B): Stream[B] =
-    if (isEmpty) Stream.empty
-    else Stream.cons(f(head), tail map f)
-
-  /** Apply the given function <code>f</code> to each element of this stream
-   *  (while respecting the order of the elements).
-   *
-   *  @param f the treatment to apply to each element.
-   */
-  override final def foreach(f: A => Unit) {
-    if (isEmpty) {}
-    else { f(head); tail.foreach(f) }
-  }
-
-  /** Returns all the elements of this stream that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *
-   *  @param p the predicate used to filter the stream.
-   *  @return the elements of this stream satisfying <code>p</code>.
-   */
-  override final def filter(p: A => Boolean): Stream[A] = {
-    if (isEmpty) this
-    else if (p(head)) Stream.cons(head, tail.filter(p))
-    else tail.filter(p)
-  }
-
-  /** Tests if the predicate <code>p</code> is satisfied by all elements
-   *  in this stream.
-   *
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff all elements of this stream satisfy the
-   *           predicate <code>p</code>.
-   */
-  override final def forall(p: A => Boolean): Boolean = {
-    if (isEmpty) true
-    else if (p(head)) tail.forall(p)
-    else false
-  }
-
-  /** Tests the existence in this stream of an element that satisfies the
-   *  predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff there exists an element in this stream that
-   *           satisfies the predicate <code>p</code>.
-   */
-  override final def exists(p: A => Boolean): Boolean = {
-    if (isEmpty) false
-    else if (p(head)) true
-    else tail.exists(p)
-  }
-
-  /** Combines the elements of this stream together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the stream is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  override final def foldLeft[B](z: B)(f: (B, A) => B): B = {
-    if (isEmpty) z
-    else tail.foldLeft(f(z, head))(f)
-  }
-
-  /** Combines the elements of this stream together using the binary
-   *  function <code>f</code>, from rigth to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the stream is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  override def foldRight[B](z: B)(f: (A, B) => B): B =
-    if (isEmpty) z
-    else f(head, tail.foldRight(z)(f))
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this stream, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this stream is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  override def flatMap[B](f: A => Iterable[B]): Stream[B] = {
-    // drops A's for which f yields an empty Iterable[B]
-    def loop(s: Stream[A]): Stream[B] = {
-      if (s.isEmpty)
-        Stream.empty
-      else {
-        val i = f(s.head)
-        if (i isEmpty)
-          loop(s.tail)
-        else
-          i.toStream append loop(s.tail)
-      }
-    }
-
-    loop(this)
-  }
-
-  override def toStream = this
-
-  /** A stream consisting of all elements of this stream in reverse order.
-   */
-  override def reverse: Stream[A] =
-    foldLeft(Stream.empty: Stream[A])((xs, x) => Stream.cons(x, xs))
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this stream starting at position <code>start</code>.
-   *
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  override final def copyToArray[B >: A](xs: Array[B], start: Int) {
-    if (!isEmpty) { xs(start) = head; tail.copyToArray(xs, start + 1) }
-  }
-
-  /** Returns a stream formed from this stream and the specified stream
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two streams is longer than the other, its remaining elements are ignored.
-   *
-   *  @return     <code>Stream({a<sub>0</sub>,b<sub>0</sub>}, ...,
-   *              {a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>)}</code> when
-   *              <code>Stream(a<sub>0</sub>, ..., a<sub>m</sub>)
-   *              zip Stream(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
-   */
-  def zip[B](that: Stream[B]): Stream[(A, B)] =
-    if (this.isEmpty || that.isEmpty) Stream.empty
-    else Stream.cons((this.head, that.head), this.tail zip that.tail)
-
-
-  /** Returns a stream that pairs each element of this stream
-   *  with its index, counting from 0.
-   *
-   *  @return      the stream <code>Stream({a<sub>0</sub>,0}, {a<sub>0</sub>,1},...)</code>
-   *               where <code>a<sub>i</sub></code> are the elements of this stream.
-   */
-  def zipWithIndex: Stream[(A, Int)] =
-    zip(Stream.from(0))
-
-  /** Prints elements of this stream one by one, separated by commas */
-  def print { print(", ") }
-
-  /** Prints elements of this stream one by one, separated by <code>sep</code>
-   *  @param sep   The separator string printed between consecutive elements.
-   */
-  def print(sep: String) {
-    if (isEmpty) Console.println("Stream.empty")
-    else { Console.print(head); Console.print(sep); tail.print(sep) }
-  }
-
-  /** Converts stream to string */
-  override def toString =
-    "Stream(" + addDefinedElems(new StringBuilder(), "") + ")"
-
-  /** Write all elements of this string into given string builder */
-  protected def addDefinedElems(buf: StringBuilder, prefix: String): StringBuilder
-}
diff --git a/src/library/scala/StringBuilder.scala b/src/library/scala/StringBuilder.scala
deleted file mode 100644
index 3d06a96c0f..0000000000
--- a/src/library/scala/StringBuilder.scala
+++ /dev/null
@@ -1,935 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala
-
-import Predef._
-
-/** <p>
- *    A mutable sequence of characters.  This class provides an API compatible
- *    with <a class="java/lang/StringBuilder" href="" target="_top">
- *    <code>java.lang.StringBuilder</code></a>.
- *  </p>
- *
- *  @author Stephane Micheloud
- *  @version 1.0
- */
-@serializable
-@SerialVersionUID(0 - 8525408645367278351L)
-final class StringBuilder(initCapacity: Int, private val initValue: String)
-      extends (Int => Char) {
-  if (initCapacity < 0) throw new IllegalArgumentException
-  if (initValue eq null) throw new NullPointerException
-
-  /** The value is used for character storage. */
-  private var value = new Array[Char](initCapacity + initValue.length)
-
-  /** The count is the number of characters used. */
-  private var count: Int = 0
-
-  /** Constructs a string builder with no characters in it and an
-   *  initial capacity of 16 characters.
-   */
-  def this() = this(16, "")
-
-  /** Constructs a string builder with no characters in it and an
-   *  initial capacity specified by the <code>capacity</code> argument.
-   *
-   *  @param  capacity  the initial capacity.
-   *  @throws NegativeArraySizeException  if the <code>capacity</code>
-   *                    argument is less than <code>0</code>.
-   */
-  def this(capacity: Int) = this(capacity, "")
-
-  def this(str: String) = this(16, str)
-
-  append(initValue)
-
-  def toArray: Array[Char] = value
-
-  def length: Int = count
-
-  def length_=(n: Int) { setLength(n) }
-
-  /** Sets the length of the character sequence.
-   *
-   *  @param  newLength  the new length
-   *  @throws IndexOutOfBoundsException  if the <code>n</code> argument is negative.
-   */
-  def setLength(n: Int) {
-    if (n < 0)
-      throw new StringIndexOutOfBoundsException(n)
-    if (n > value.length) expandCapacity(n)
-    if (count < n)
-      while (count < n) {
-        value(count) = '\0'; count += 1
-      }
-    else
-      count = n
-  }
-
-  /** Returns the current capacity. The capacity is the amount of storage
-   *  available for newly inserted characters, beyond which an allocation
-   *  will occur.
-   *
-   *  @return  the current capacity
-   */
-  def capacity: Int = value.length
-
-  /** Same as <code>ensureCapacity</code>. */
-  def capacity_=(n: Int) { ensureCapacity(n) }
-
-  /** <p>
-   *    Ensures that the capacity is at least equal to the specified minimum.
-   *    If the current capacity is less than the argument, then a new internal
-   *    array is allocated with greater capacity. The new capacity is the larger of:
-   *  </p>
-   *  <ul>
-   *    <li>The <code>n</code> argument.
-   *    <li>Twice the old capacity, plus <code>2</code>.
-   *  </ul>
-   *  <p>
-   *    If the <code>n</code> argument is non-positive, this
-   *    method takes no action and simply returns.
-   *  </p>
-   *
-   *  @param n the minimum desired capacity.
-   */
-  def ensureCapacity(n: Int) {
-    if (n > value.length) expandCapacity(n)
-  }
-
-  private def expandCapacity(n: Int) {
-    val newCapacity = (value.length + 1) * 2
-    value = StringBuilder.copyOf(
-      value,
-      if (newCapacity < 0) Math.MAX_INT else if (n > newCapacity) n else newCapacity
-    )
-  }
-
-  /** <p>
-   *    Returns the <code>Char</code> value in this sequence at the specified index.
-   *    The first <code>Char</code> value is at index <code>0</code>, the next at index
-   *    <code>1</code>, and so on, as in array indexing.
-   *  </p>
-   *  <p>
-   *    The index argument must be greater than or equal to
-   *    <code>0</code>, and less than the length of this sequence.
-   *  </p>
-   *
-   *  @param  index   the index of the desired <code>Char</code> value.
-   *  @return         the <code>Char</code> value at the specified index.
-   *  @throws IndexOutOfBoundsException  if <code>index</code> is
-   *                  negative or greater than or equal to <code>length()</code>.
-   */
-  def charAt(index: Int): Char = {
-    if (index < 0 || index >= count)
-      throw new StringIndexOutOfBoundsException(index)
-    value(index)
-  }
-
-  /** Same as <code>charAt</code>. */
-  def apply(i: Int): Char = charAt(i)
-
-  /** <p>
-   *    Removes the <code>Char</code> at the specified position in this
-   *    sequence. This sequence is shortened by one <code>Char</code>.
-   *  </p>
-   *
-   *  @param  index  Index of <code>Char</code> to remove
-   *  @return        This object.
-   *  @throws StringIndexOutOfBoundsException  if the <code>index</code>
-   *	             is negative or greater than or equal to <code>length()</code>.
-   */
-  def deleteCharAt(index: Int): StringBuilder = {
-    if (index < 0 || index >= count)
-      throw new StringIndexOutOfBoundsException(index)
-    compat.Platform.arraycopy(value, index + 1, value, index, count - index - 1)
-    count -= 1
-    this
-  }
-
-  /** <p>
-   *    The character at the specified index is set to <code>ch</code>. This
-   *    sequence is altered to represent a new character sequence that is
-   *    identical to the old character sequence, except that it contains the
-   *    character <code>ch</code> at position <code>index</code>.
-   *  </p>
-   *  <p>
-   *    The index argument must be greater than or equal to
-   *    <code>0</code>, and less than the length of this sequence.
-   *  </p>
-   *
-   *  @param  index   the index of the character to modify.
-   *  @param  ch      the new character.
-   *  @throws IndexOutOfBoundsException  if <code>index</code> is
-   *                  negative or greater than or equal to <code>length()</code>.
-   */
-  def setCharAt(index: Int, ch: Char) {
-    if (index < 0 || index >= count)
-      throw new StringIndexOutOfBoundsException(index)
-    value(index) = ch
-  }
-
-  /** Same as <code>setCharAt</code>. */
-  def update(i: Int, c: Char) { setCharAt(i, c) }
-
-  /** Returns a new <code>String</code> that contains a subsequence of
-   *  characters currently contained in this character sequence. The
-   *  substring begins at the specified index and extends to the end of
-   *  this sequence.
-   *
-   *  @param  start  The beginning index, inclusive.
-   *  @return        The new string.
-   *  @throws StringIndexOutOfBoundsException  if <code>start</code> is
-   *                 less than zero, or greater than the length of this object.
-   */
-  def substring(start: Int): String = substring(start, count)
-
-  /** Returns a new <code>String</code> that contains a subsequence of
-   *  characters currently contained in this sequence. The
-   *  substring begins at the specified <code>start</code> and
-   *  extends to the character at index <code>end - 1</code>.
-   *
-   *  @param  start  The beginning index, inclusive.
-   *  @param  end    The ending index, exclusive.
-   *  @return The new string.
-   *  @throws StringIndexOutOfBoundsException  if <code>start</code>
-   *                 or <code>end</code> are negative or greater than
-   *		     <code>length()</code>, or <code>start</code> is
-   *		     greater than <code>end</code>.
-   */
-  def substring(start: Int, end: Int): String = {
-    if (start < 0)
-      throw new StringIndexOutOfBoundsException(start)
-    if (end > count)
-      throw new StringIndexOutOfBoundsException(end)
-    if (start > end)
-      throw new StringIndexOutOfBoundsException(end - start)
-    new String(value, start, end - start)
-  }
-
-  /** <p>
-   *    Appends the string representation of the <code>Any</code>
-   *    argument.
-   *  </p>
-   *  <p>
-   *    The argument is converted to a string as if by the method
-   *    <code>String.valueOf</code>, and the characters of that
-   *    string are then appended to this sequence.
-   *  </p>
-   *
-   *  @param  x   an <code>Any</code> object.
-   *  @return     a reference to this object.
-   */
-  def append(x: Any): StringBuilder =
-    append(String.valueOf(x))
-
-  /** Appends the specified string to this character sequence.
-   *
-   *  @param  s   a string.
-   *  @return     a reference to this object.
-   */
-  def append(s: String): StringBuilder = {
-    val str = if (s == null) "null" else s
-    val len = str.length
-    if (len > 0) {
-      val newCount = count + len
-      if (newCount > value.length) expandCapacity(newCount)
-      str.getChars(0, len, value, count)
-      count = newCount
-    }
-    this
-  }
-
-  /** Appends the specified string builder to this sequence.
-   *
-   *  @param sb
-   *  @return
-   */
-  def append(sb: StringBuilder): StringBuilder =
-    if (sb == null)
-      append("null")
-    else {
-      val len = sb.length
-      val newCount = count + len
-      if (newCount > value.length) expandCapacity(newCount)
-      compat.Platform.arraycopy(sb.toArray, 0, value, count, len)
-      count = newCount
-      this
-    }
-
-  /** <p>
-   *    Appends the string representation of the <code>Char</code> sequence
-   *    argument to this sequence.
-   *  </p>
-   *  <p>
-   *    The characters of the sequence argument are appended, in order,
-   *    to the contents of this sequence. The length of this sequence
-   *    increases by the length of the argument.
-   *  </p>
-   *
-   *  @param  x  the characters to be appended.
-   *  @return    a reference to this object.
-   */
-  def append(x: Seq[Char]): StringBuilder =
-    append(x.toArray, 0, x.length)
-
-  /** <p>
-   *    Appends the string representation of the <code>Char</code> array
-   *    argument to this sequence.
-   *  </p>
-   *  <p>
-   *    The characters of the array argument are appended, in order, to
-   *    the contents of this sequence. The length of this sequence
-   *    increases by the length of the argument.
-   *  </p>
-   *
-   *  @param  x  the characters to be appended.
-   *  @return    a reference to this object.
-   */
-  def append(x: Array[Char]): StringBuilder =
-    append(x, 0, x.length)
-
-  /** <p>
-   *    Appends the string representation of a subarray of the
-   *    <code>char</code> array argument to this sequence.
-   *  </p>
-   *  <p>
-   *    Characters of the <code>Char</code> array <code>x</code>, starting at
-   *    index <code>offset</code>, are appended, in order, to the contents
-   *    of this sequence. The length of this sequence increases
-   *    by the value of <code>len</code>.
-   *  </p>
-   *
-   *  @param  x      the characters to be appended.
-   *  @param  offset the index of the first <code>Char</code> to append.
-   *  @param  len    the number of <code>Char</code>s to append.
-   *  @return        a reference to this object.
-   */
-  def append(x: Array[Char], offset: Int, len: Int): StringBuilder = {
-    val newCount = count + len
-    if (newCount > value.length) expandCapacity(newCount)
-    compat.Platform.arraycopy(x, offset, value, count, len)
-    count = newCount
-    this
-  }
-
-  /** <p>
-   *    Appends the string representation of the <code>Boolean</code>
-   *    argument to the sequence.
-   *  </p>
-   *  <p>
-   *    The argument is converted to a string as if by the method
-   *    <code>String.valueOf</code>, and the characters of that
-   *   string are then appended to this sequence.
-   *  </p>
-   *
-   *   @param  x  a <code>Boolean</code>.
-   *   @return    a reference to this object.
-   */
-  def append(x: Boolean): StringBuilder = {
-    if (x) {
-      val newCount = count + 4
-      if (newCount > value.length) expandCapacity(newCount)
-      value(count) = 't'; count += 1
-      value(count) = 'r'; count += 1
-      value(count) = 'u'; count += 1
-      value(count) = 'e'; count += 1
-    } else {
-      val newCount = count + 5
-      if (newCount > value.length) expandCapacity(newCount)
-      value(count) = 'f'; count += 1
-      value(count) = 'a'; count += 1
-      value(count) = 'l'; count += 1
-      value(count) = 's'; count += 1
-      value(count) = 'e'; count += 1
-    }
-    this
-  }
-
-  def append(x: Byte): StringBuilder =
-    append(String.valueOf(x))
-
-  def append(x: Char): StringBuilder = {
-    val newCount = count + 1
-    if (newCount > value.length) expandCapacity(newCount)
-    value(count) = x; count += 1
-    this
-  }
-
-  def append(x: Short): StringBuilder =
-    append(String.valueOf(x))
-
-  def append(x: Int): StringBuilder =
-    append(String.valueOf(x))
-
-  def append(x: Long): StringBuilder =
-    append(String.valueOf(x))
-
-  def append(x: Float): StringBuilder =
-    append(String.valueOf(x))
-
-  def append(x: Double): StringBuilder =
-    append(String.valueOf(x))
-
-  /** Removes the characters in a substring of this sequence.
-   *  The substring begins at the specified <code>start</code> and extends to
-   *  the character at index <code>end - 1</code> or to the end of the
-   *  sequence if no such character exists. If
-   *  <code>start</code> is equal to <code>end</code>, no changes are made.
-   *
-   *  @param  start  The beginning index, inclusive.
-   *  @param  end    The ending index, exclusive.
-   *  @return        This object.
-   *  @throws StringIndexOutOfBoundsException  if <code>start</code>
-   *                 is negative, greater than <code>length()</code>, or
-   *		     greater than <code>end</code>.
-   */
-  def delete(start: Int, end: Int): StringBuilder = {
-    if (start < 0 || start > end)
-      throw new StringIndexOutOfBoundsException(start)
-    val end0 = if (end > count) count else end
-    val len = end0 - start
-    if (len > 0) {
-      compat.Platform.arraycopy(value, start + len, value, start, count - end0)
-      count -= len
-    }
-    this
-  }
-
-  /** Replaces the characters in a substring of this sequence
-   *  with characters in the specified <code>String</code>. The substring
-   *  begins at the specified <code>start</code> and extends to the character
-   *  at index <code>end - 1</code> or to the end of the sequence if no such
-   *  character exists. First the characters in the substring are removed and
-   *  then the specified <code>String</code> is inserted at <code>start</code>.
-   *
-   *  @param  start  The beginning index, inclusive.
-   *  @param  end    The ending index, exclusive.
-   *  @param  str    String that will replace previous contents.
-   *  @return        This object.
-   *  @throws StringIndexOutOfBoundsException  if <code>start</code>
-   *                 is negative, greater than <code>length()</code>, or
-   *		     greater than <code>end</code>.
-   */
-  def replace(start: Int, end: Int, str: String) {
-    if (start < 0 || start > count || start > end)
-      throw new StringIndexOutOfBoundsException(start)
-
-    val end0 = if (end > count) count else end
-    val len = str.length()
-    val newCount = count + len - (end0 - start)
-    if (newCount > value.length) expandCapacity(newCount)
-
-    compat.Platform.arraycopy(value, end, value, start + len, count - end)
-    str.getChars(0, len, value, start)
-    count = newCount
-    this
-  }
-
-  /** Inserts the string representation of a subarray of the <code>str</code>
-   *  array argument into this sequence. The subarray begins at the specified
-   *  <code>offset</code> and extends <code>len</code> <code>char</code>s.
-   *  The characters of the subarray are inserted into this sequence at
-   *  the position indicated by <code>index</code>. The length of this
-   *  sequence increases by <code>len</code> <code>Char</code>s.
-   *
-   * @param  index   position at which to insert subarray.
-   * @param  str     a <code>Char</code> array.
-   * @param  offset  the index of the first <code>char</code> in subarray to
-   *                 be inserted.
-   * @param  len     the number of <code>Char</code>s in the subarray to
-   *                 be inserted.
-   * @return         This object
-   * @throws StringIndexOutOfBoundsException  if <code>index</code>
-   *                 is negative or greater than <code>length()</code>, or
-   *                 <code>offset</code> or <code>len</code> are negative, or
-   *                 <code>(offset+len)</code> is greater than
-   *                 <code>str.length</code>.
-   */
-  def insert(index: Int, str: Array[Char], offset: Int, len: Int): StringBuilder = {
-    if (index < 0 || index > count)
-      throw new StringIndexOutOfBoundsException(index)
-    if (offset < 0 || len < 0 || offset > str.length - len)
-      throw new StringIndexOutOfBoundsException(
-                "offset " + offset + ", len " + len +
-                ", str.length " + str.length)
-    val newCount = count + len
-    if (newCount > value.length) expandCapacity(newCount)
-    compat.Platform.arraycopy(value, index, value, index + len, count - index)
-    compat.Platform.arraycopy(str, offset, value, index, len)
-    count = newCount
-    this
-  }
-
-  /** <p>
-   *    Inserts the string representation of the <code>Any</code>
-   *    argument into this character sequence.
-   *  </p>
-   *  <p>
-   *    The second argument is converted to a string as if by the method
-   *    <code>String.valueOf</code>, and the characters of that
-   *    string are then inserted into this sequence at the indicated
-   *    offset.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to
-   *    <code>0</code>, and less than or equal to the length of this
-   *    sequence.
-   *  </p>
-   *
-   *  @param  offset  the offset.
-   *  @param  x       an <code>Any</code> value.
-   *  @return         a reference to this object.
-   *  @throws StringIndexOutOfBoundsException  if the offset is invalid.
-   */
-  def insert(at: Int, x: Any): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** Inserts the string into this character sequence.
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a string.
-   *  @return     a reference to this object.
-   *  @throws StringIndexOutOfBoundsException  if the offset is invalid.
-   */
-  def insert(at: Int, x: String): StringBuilder = {
-    if (at < 0 || at > count)
-      throw new StringIndexOutOfBoundsException(at)
-    val str = if (x == null) "null" else x
-    val len = str.length
-    val newCount = count + len
-    if (newCount > value.length) expandCapacity(newCount)
-    compat.Platform.arraycopy(value, at, value, at + len, count - at)
-    str.getChars(0, len, value, at)
-    count = newCount
-    this
-  }
-
-  /** Inserts the string representation of the <code>Char</code> sequence
-   *  argument into this sequence.
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a character sequence.
-   *  @return     a reference to this object.
-   *  @throws StringIndexOutOfBoundsException  if the offset is invalid.
-   */
-  def insert(at: Int, x: Seq[Char]): StringBuilder =
-    insert(at, x.toArray)
-
-  /** Inserts the string representation of the <code>Char</code> array
-   *  argument into this sequence.
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a character array.
-   *  @return     a reference to this object.
-   *  @throws StringIndexOutOfBoundsException  if the offset is invalid.
-   */
-  def insert(at: Int, x: Array[Char]): StringBuilder = {
-    if (at < 0 || at > count)
-      throw new StringIndexOutOfBoundsException(at)
-    val len = x.length
-    val newCount = count + len
-    if (newCount > value.length) expandCapacity(newCount)
-    compat.Platform.arraycopy(value, at, value, at + len, count - at)
-    compat.Platform.arraycopy(x, 0, value, at, len)
-    count = newCount
-    this
-  }
-
-  /** <p>
-   *    Inserts the string representation of the <code>Boolean</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Boolean</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Boolean): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Byte</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Byte</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Byte): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Char</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Char</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Char): StringBuilder = {
-    if (at < 0 || at > count)
-      throw new StringIndexOutOfBoundsException(at)
-    val newCount = count + 1
-    if (newCount > value.length) expandCapacity(newCount)
-    compat.Platform.arraycopy(value, at, value, at + 1, count - at)
-    value(at) = x
-    count = newCount
-    this
-  }
-
-  /** <p>
-   *    Inserts the string representation of the <code>Short</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Short</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Short): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Int</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Int</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Int): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Long</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Long</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Long): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Float</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Float</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Float): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Inserts the string representation of the <code>Double</code> argument
-   *    into this sequence.
-   *  </p>
-   *  <p>
-   *    The offset argument must be greater than or equal to 0, and less than
-   *    or equal to the length of this sequence.
-   *  </p>
-   *
-   *  @param  at  the offset position.
-   *  @param  x   a <code>Double</code> value.
-   *  @return     a reference to this object.
-   */
-  def insert(at: Int, x: Double): StringBuilder =
-    insert(at, String.valueOf(x))
-
-  /** <p>
-   *    Returns the index within this string of the first occurrence of the
-   *    specified substring. The integer returned is the smallest value
-   *    <i>k</i> such that:
-   *  </p>
-   *  <blockquote><pre>
-   *  this.toString().startsWith(str, <i>k</i>)</pre>
-   *  </blockquote>
-   *  <p>
-   *    is <code>true</code>.
-   *  </p>
-   *
-   *  @param  str  any string.
-   *  @return      if the string argument occurs as a substring within this
-   *               object, then the index of the first character of the first
-   *               such substring is returned; if it does not occur as a
-   *               substring, <code>-1</code> is returned.
-   *  @throws NullPointerException if <code>str</code> is <code>null</code>.
-   */
-  def indexOf(str: String): Int = indexOf(str, 0)
-
-  /** <p>
-   *    Returns the index within this string of the first occurrence of the
-   *    specified substring, starting at the specified index. The integer
-   *    returned is the smallest value <code>k</code> for which:
-   *  </p><pre>
-   *    k >= Math.min(fromIndex, str.length()) &&
-   *                   this.toString().startsWith(str, k)</pre>
-   *  <p>
-   *    If no such value of <code>k</code> exists, then <code>-1</code>
-   *    is returned.
-   *  </p>
-   *
-   *  @param str        the substring for which to search.
-   *  @param fromIndex  the index from which to start the search.
-   *  @return           the index within this string of the first occurrence
-   *                    of the specified substring, starting at the specified index.
-   */
-  def indexOf(str: String, fromIndex: Int): Int =
-    StringBuilder.indexOf(value, 0, count, str.toCharArray, 0, str.length(), fromIndex)
-
-  /** <p>
-   *    Returns the index within this string of the rightmost occurrence
-   *    of the specified substring.  The rightmost empty string "" is
-   *    considered to occur at the index value <code>this.length()</code>.
-   *    The returned index is the largest value <i>k</i> such that
-   *  </p>
-   *  <blockquote><pre>
-   *  this.toString().startsWith(str, k)</pre>
-   *  </blockquote>
-   *  <p>
-   *    is true.
-   *  </p>
-   *
-   * @param  str  the substring to search for.
-   * @return      if the string argument occurs one or more times as a substring
-   *              within this object, then the index of the first character of
-   *              the last such substring is returned. If it does not occur as
-   *              a substring, <code>-1</code> is returned.
-   * @throws NullPointerException  if <code>str</code> is <code>null</code>.
-   */
-  def lastIndexOf(str: String): Int = lastIndexOf(str, count)
-
-  /** <p>
-   *    Returns the index within this string of the last occurrence of the
-   *    specified substring. The integer returned is the largest value
-   *    <code>k</code> such that:
-   *  </p><pre>
-   *    k <= Math.min(fromIndex, str.length()) &&
-   *                   this.toString().startsWith(str, k)</pre>
-   *  <p>
-   *    If no such value of <code>k</code> exists, then <code>-1</code>
-   *    is returned.
-   *  </p>
-   *
-   *  @param  str        the substring to search for.
-   *  @param  fromIndex  the index to start the search from.
-   *  @return            the index within this sequence of the last occurrence
-   *                     of the specified substring.
-   */
-  def lastIndexOf(str: String, fromIndex: Int): Int =
-    StringBuilder.lastIndexOf(value, 0, count, str.toCharArray, 0, str.length(), fromIndex)
-
-  /** <p>
-   *    Causes this character sequence to be replaced by the reverse of the
-   *    sequence. If there are any surrogate pairs included in the sequence,
-   *    these are treated as single characters for the reverse operation.
-   *    Thus, the order of the high-low surrogates is never reversed.
-   *  </p>
-   *  <p>
-   *    Let <i>n</i> be the character length of this character sequence
-   *    (not the length in <code>Char</code> values) just prior to
-   *    execution of the <code>reverse</code> method. Then the
-   *    character at index <i>k</i> in the new character sequence is
-   *    equal to the character at index <i>n-k-1</i> in the old
-   *    character sequence.
-   *  </p>
-   *
-   *  @return  a reference to this object.
-   */
-  def reverse(): StringBuilder = {
-    var hasSurrogate = false
-    val n = count - 1
-    var j = (n-1) >> 1
-    while (j >= 0) {
-      val temp = value(j)
-      val temp2 = value(n - j)
-      if (!hasSurrogate)
-        hasSurrogate =
-          (temp >= Character.MIN_HIGH_SURROGATE && temp <= Character.MAX_LOW_SURROGATE) ||
-       	  (temp2 >= Character.MIN_HIGH_SURROGATE && temp2 <= Character.MAX_LOW_SURROGATE)
-      value(j) = temp2
-      value(n - j) = temp
-      j -= 1
-    }
-    if (hasSurrogate) {
-      // Reverse back all valid surrogate pairs
-      var i = 0
-      while (i < count - 1) {
-        val c2 = value(i)
-	if (Character.isLowSurrogate(c2)) {
-          val c1 = value(i + 1)
-          if (Character.isHighSurrogate(c1)) {
-            value(i) = c1; i += 1
-            value(i) = c2
-          }
-        }
-        i += 1
-      }
-    }
-    this
-  }
-
-  /** Returns a string representing the data in this sequence.
-   *  A new <code>String</code> object is allocated and initialized to
-   *  contain the character sequence currently represented by this
-   *  object. This <code>String</code> is then returned. Subsequent
-   *  changes to this sequence do not affect the contents of the
-   *  <code>String</code>.
-   *
-   *  @return  a string representation of this sequence of characters.
-   */
-  override def toString(): String = new String(value, 0, count)
-
-  @throws(classOf[java.io.IOException])
-  private def writeObject(s: java.io.ObjectOutputStream) {
-    s.defaultWriteObject()
-    s.writeInt(count)
-    s.writeObject(value)
-  }
-
-  @throws(classOf[java.io.IOException])
-  private def readObject(s: java.io.ObjectInputStream ) {
-    s.defaultReadObject()
-    count = s.readInt()
-    value = s.readObject().asInstanceOf[Array[Char]]
-  }
-
-}
-
-
-object StringBuilder
-{
-  // method <code>java.util.Arrays.copyOf</code> exists since 1.6
-  private def copyOf(src: Array[Char], newLength: Int): Array[Char] = {
-    val dest = new Array[Char](newLength)
-    compat.Platform.arraycopy(src, 0, dest, 0, Math.min(src.length, newLength))
-    dest
-  }
-
-  private def indexOf(source: Array[Char], sourceOffset: Int, sourceCount: Int,
-                      target: Array[Char], targetOffset: Int, targetCount: Int,
-                      fromIndex: Int): Int =
-    if (fromIndex >= sourceCount)
-      if (targetCount == 0) sourceCount else -1
-    else {
-      val inx = if (fromIndex < 0) 0 else fromIndex
-      if (targetCount == 0)
-        inx
-      else {
-        val first  = target(targetOffset)
-        val max = sourceOffset + (sourceCount - targetCount)
-
-        var i = sourceOffset + inx
-        while (i <= max) {
-          /* Look for first character. */
-          if (source(i) != first) {
-            i += 1
-            while (i <= max && source(i) != first) i += 1
-          }
-          /* Found first character, now look at the rest of v2 */
-          if (i <= max) {
-            var j = i + 1
-            val end = j + targetCount - 1
-            var k = targetOffset + 1
-            while (j < end && source(j) == target(k)) {
-              j += 1
-              k += 1
-            }
-            if (j == end) {
-              /* Found whole string. */
-              return i - sourceOffset
-            }
-          } // if
-          i += 1
-        } // while
-        -1
-      }
-    }
-
-  private def lastIndexOf(source: Array[Char], sourceOffset: Int, sourceCount: Int,
-                          target: Array[Char], targetOffset: Int, targetCount: Int,
-                          fromIndex: Int): Int = {
-    val rightIndex = sourceCount - targetCount
-    if (fromIndex < 0) return -1
-    val inx = if (fromIndex > rightIndex) rightIndex else fromIndex
-    // Empty string always matches
-    if (targetCount == 0) return inx
-
-    val strLastIndex = targetOffset + targetCount - 1
-    val strLastChar = target(strLastIndex)
-    val min = sourceOffset + targetCount - 1
-    var i = min + fromIndex
-
-    while (true) {
-      while (i >= min && source(i) != strLastChar) i -= 1
-      if (i < min) return -1
-      var j = i - 1
-      val start = j - (targetCount - 1)
-      var k = strLastIndex - 1
-      var outerWhile = false
-      while (j > start && !outerWhile) {
-        if (source(j) != target(k)) {
-          j -= 1
-          k -= 1
-          i -= 1
-          outerWhile = true
-        }
-      }
-      if (!outerWhile) return start - sourceOffset + 1
-    }
-    -1
-  }
-
-  implicit def toCharSequence(sb: StringBuilder): java.lang.CharSequence = new java.lang.CharSequence {
-    def length: Int = sb.length
-    def charAt(index: Int): Char = sb.charAt(index)
-    def subSequence(start: Int, end: Int): java.lang.CharSequence = sb.substring(start, end)
-    override def toString: String = sb.toString
-  }
-}
diff --git a/src/library/scala/Symbol.scala b/src/library/scala/Symbol.scala
index e1a1c66bd4..becb37bc96 100644
--- a/src/library/scala/Symbol.scala
+++ b/src/library/scala/Symbol.scala
@@ -11,9 +11,12 @@
 
 package scala
 
-import scala.collection.jcl
+// jcl disabled for now; go directly to java collections.
+//import scala.collection.jcl
 
-private[scala] object internedSymbols extends jcl.WeakHashMap[String, ref.WeakReference[Symbol]]
+//private[scala] object internedSymbols extends jcl.WeakHashMap[String, ref.WeakReference[Symbol]]
+private[scala] object internedSymbols
+  extends java.util.WeakHashMap[String, java.lang.ref.WeakReference[Symbol]]
 
 /** <p>
  *    This class provides a simple way to get unique objects for
@@ -56,13 +59,20 @@ object Symbol {
    *  @return the unique reference to this string.
    */
   def apply(name: String): Symbol = internedSymbols.synchronized {
-    internedSymbols.get(name).flatMap(_.get) match {
-    case Some(sym) => sym
-    case _ =>
-      val sym = new Symbol(name)
-      internedSymbols(name) = new ref.WeakReference(sym)
-      sym
+//    internedSymbols.get(name).flatMap(_.get) match {
+//    case Some(sym) => sym
+//    case _ =>
+//      val sym = new Symbol(name)
+//      internedSymbols(name) = new ref.WeakReference(sym)
+//      sym
+    var sym: Symbol = null
+    val ref = internedSymbols.get(name)
+    if (ref != null) sym = ref.get
+    if (sym == null) {
+      sym = new Symbol(name)
+      internedSymbols.put(name, new java.lang.ref.WeakReference(sym))
     }
+    sym
   }
 
   def unapply(other: Symbol): Option[String] = Some(other.name)
diff --git a/src/library/scala/Tuple2.scala b/src/library/scala/Tuple2.scala
index e04a1b11c8..ccf8f189d5 100644
--- a/src/library/scala/Tuple2.scala
+++ b/src/library/scala/Tuple2.scala
@@ -1,7 +1,7 @@
 
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
+**    / __/ __// _ | / /  / _ |    (c) 2002-2008, LAMP/EPFL             **
 **  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
 ** /____/\___/_/ |_/____/_/ | |                                         **
 **                          |/                                          **
@@ -13,6 +13,73 @@
 
 package scala
 
+import annotation.unchecked.uncheckedVariance
+
+object Tuple2 {
+
+  import collection.generic._
+/* !!! todo: enable
+  class IterableOps[CC[+B] <: Iterable[B] with IterableTemplate[CC, B @uncheckedVariance], A1, A2](tuple: (CC[A1], Iterable[A2])) {
+    def zip: CC[(A1, A2)] = {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      val b = (tuple._1: IterableTemplate[CC, A1]).newBuilder[(A1, A2)]
+        // : needed because otherwise it picks Iterable's builder.
+      while (elems1.hasNext && elems2.hasNext)
+        b += ((elems1.next, elems2.next))
+      b.result
+    }
+    def map[B](f: (A1, A2) => B): CC[B] = {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      val b = (tuple._1: IterableTemplate[CC, A1]).newBuilder[B]
+      while (elems1.hasNext && elems2.hasNext)
+        b += f(elems1.next, elems2.next)
+      b.result
+    }
+    def flatMap[B](f: (A1, A2) => CC[B]): CC[B] = {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      val b = (tuple._1: IterableTemplate[CC, A1]).newBuilder[B]
+      while (elems1.hasNext && elems2.hasNext)
+        b ++= f(elems1.next, elems2.next)
+      b.result
+    }
+    def foreach(f: (A1, A2) => Unit) {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      while (elems1.hasNext && elems2.hasNext)
+        f(elems1.next, elems2.next)
+    }
+    def forall(p: (A1, A2) => Boolean): Boolean = {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      while (elems1.hasNext && elems2.hasNext)
+        if (!p(elems1.next, elems2.next)) return false
+      true
+    }
+    def exists(p: (A1, A2) => Boolean): Boolean = {
+      val elems1 = tuple._1.elements
+      val elems2 = tuple._2.elements
+      while (elems1.hasNext && elems2.hasNext)
+        if (p(elems1.next, elems2.next)) return true
+      false
+    }
+  }
+  implicit def tupleOfIterableWrapper[CC[+B] <: Iterable[B] with IterableTemplate[CC, B], A1, A2](tuple: (CC[A1], Iterable[A2])) =
+    new IterableOps[CC, A1, A2](tuple)
+
+
+/* A more general version which will probably not work.
+  implicit def tupleOfIterableWrapper[CC[+B] <: Iterable[B] with IterableTemplate[CC, B], A1, A2, B1 <: CC[A1]](tuple: B1, Iterable[A2]) =
+    new IterableOps[CC, A1, A2](tuple)
+*/
+
+  // Adriaan: If you drop the type parameters it will infer the wrong types.
+  tupleOfIterableWrapper[collection.immutable.List, Int, Int]((collection.immutable.Nil, collection.immutable.Nil)) forall (_ + _ < 10)
+*/
+}
+
 /** Tuple2 is the canonical representation of a @see Product2
  *
  */
diff --git a/src/library/scala/Unhashable.scala b/src/library/scala/Unhashable.scala
new file mode 100644
index 0000000000..a89d331875
--- /dev/null
+++ b/src/library/scala/Unhashable.scala
@@ -0,0 +1,30 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala
+
+/** A marker trait for data structures that cannot be hashed, for instance
+ *  because they are mutable and at the same time support structural equaality, so hashing them
+ *  would lead to unpredictable results.
+ *  Such data structures have `hashCode` throw an UnsupportedOperationException. They retain
+ *  the original object hashcode with `identityHashCode`.
+ */
+trait Unhashable extends Object {
+
+  /** The hashCode method always yields an error, since it is not
+   *  safe to use sets as keys in hash tables.
+   *
+   *  @return never.
+   */
+  override def hashCode: Int =
+    throw new UnsupportedOperationException("unsuitable as hash key")
+
+  /** The identity hash code is the original hash code inherited from Object.
+   */
+  def identityHashCode: Int =
+    super/*[Object]*/.hashCode  // !!! super[Object] does not work here
+}
diff --git a/src/library/scala/collection/BitSet.scala b/src/library/scala/collection/BitSet.scala
index e8a4f3203a..2fb469e680 100644
--- a/src/library/scala/collection/BitSet.scala
+++ b/src/library/scala/collection/BitSet.scala
@@ -11,147 +11,21 @@
 
 package scala.collection
 
-/** <p>
- *    The class <code>BitSet</code> provides the interface for a space-efficient
- *    implementation of dense integer sets represented as bits in array of
- *    integers. Bit indices are between <code>0..(capacity-1)</code> inclusive.
- *  </p>
- *
- *  @author  Burak Emir, Stephane Micheloud, Nikolay Mihaylov
- *  @author  Martin Odersky
- *  @version 2.0  01/01/2007
- */
-
-abstract class BitSet extends Set[Int] {
-
-  import compat.Platform.arraycopy
-
-  /** number of bits in this bitset */
-  def size: Int
-
-  /**
-   *  @param i ...
-   *  @return <code>true</code> if bit <code>i</code> is set.
-   */
-  def contains(i: Int): Boolean = {
-    (i < capacity) && {
-      val j = offset(i)
-      (0 <= j) && (j < arr.length) &&
-      ((arr(j) & mask(i)) != 0)
-    }
-  }
-
-  def capacity: Int
-
-  protected def arr: Array[Int]
-
-  /** returns an iterator over the truth values of all bits */
-   final def elements: Iterator[Int] = new Iterator[Int] {
-     var i = 0
-     def findNext: Unit = {
-       while (!BitSet.this.contains(i) && (i < capacity))
-         i = i + 1
-     }
-     findNext
-     def hasNext: Boolean = i < capacity
-     def next(): Int = { val j = i; i = i + 1; findNext; j }
-   }
-
+import generic._
 
-  /**
-   * @return a copy of the array underlying this bitset
-   */
-     /*
-  def toArray: Array[Int] = {
-    val length = memsize(capacity)
-    val newarr = new Array[Int](length)
-    if (arr.length > 0)
-      arraycopy(this.arr, 0, newarr, 0, length)
-    newarr
-  }*/
-
-  /** Checks if two bitsets are structurally identical.
-   *  Uses accelerated (32 x faster) check if the other set is a BitSet
-   *
-   *  @param other ...
-   *  @return      <code>true</code>, iff both bitsets contain the same
-   *               elements.
-   */
-  override def equals(other: Any): Boolean = other match {
-    case that: BitSet =>
-      (size == that.size) && {
-        var len = memsize(Math.min(this.capacity, that.capacity))
-        var i = 0
-        while (i < len && arr(i) == that.arr(i)) i = i + 1
-        i == len
-      }
-    case _ =>
-      super.equals(other)
-  }
-
-  override def hashCode(): Int = {
-    val len = memsize(this.capacity)
-    var h = 0
-    var i = 0
-    while (i < len) { h = h * 41 + arr(i); i = i + 1 }
-    h
-  }
-
-  /** Checks if this set is a subset of set <code>that</code>.
-   *  Uses accelerated (32 x faster) check if the other set is a BitSet
-   *
-   *  @param other another set.
-   *  @return      <code>true</code>, iff the other set is a superset of
-   *               this set.
-   */
-  override def subsetOf(other: Set[Int]): Boolean = other match {
-    case that: BitSet =>
-      val thisLen = memsize(this.capacity)
-      val thatLen = memsize(that.capacity)
-      val minLen = Math.min(thisLen, thatLen)
-      var i = 0
-      while (i < minLen && that.arr(i) == (that.arr(i) | arr(i))) i = i + 1
-      while (i < thisLen && arr(i) == 0) i = i + 1
-      i == thisLen
-    case _ =>
-      super.subsetOf(other)
-  }
-
-  /**
-   *  @param n the number of bits to be stored.
-   *  @return  the number of <code>Int</code> cells needed to store
-   *           <code>n</code> bits.
-   */
-  protected final def memsize(n: Int): Int = offset(n + 31)
-
-  /**
-   *  @param n ...
-   *  @return  the number of bits represented by <code>n</code> words.
-   */
-  protected final def nbits(n: Int): Int = n << 5
-
-  /**
-   *  @param n ...
-   *  @return the position in the array where the bit resides.
-   */
-  protected final def offset(n: Int): Int = n >>> 5
+/** common base class for mutable and immutable bit sets
+ */
+trait BitSet extends Set[Int] with BitSetTemplate[BitSet] {
+  override def empty = BitSet.empty
+}
 
-  /**
-   *  @param n ...
-   *  @return a mask with 1 at the position of the bit.
-   */
-  protected final def mask(n: Int): Int = 1 << (n & 0x1F)
+/** A factory object for bitsets */
+object BitSet {
 
-  /**
-   * @return a copy of the array underlying this bitset
-   */
-  def underlying : Array[Int] = {
-     val length = memsize(capacity)
-     val newarr = new Array[Int](length)
-     if (arr.length > 0)
-       arraycopy(this.arr, 0, newarr, 0, length)
-     newarr
-   }
+    /** The empty bitset */
+  val empty: BitSet = immutable.BitSet.empty
 
-  protected override def stringPrefix = "Set"
+  /** A bitset containing given elements */
+  def apply(elems: Int*) = immutable.BitSet.apply(elems: _*)
 }
+
diff --git a/src/library/scalax/collection/BufferedIterator.scala b/src/library/scala/collection/BufferedIterator.scala
index dbe4fd36d1..f990cb8748 100755
--- a/src/library/scalax/collection/BufferedIterator.scala
+++ b/src/library/scala/collection/BufferedIterator.scala
@@ -9,9 +9,9 @@
 // $Id: BufferedIterator.scala 12641 2007-08-22 16:01:57Z mcdirmid $
 
 
-package scalax.collection
+package scala.collection
 
-/** Buffered iterators are iterators which allow to inspect the next
+/** Buffered iterators are iterators which provide a method `head` that inspects the next
  *  element without discarding it.
  *
  *  @author  Martin Odersky
diff --git a/src/library/scala/collection/DefaultMap.scala b/src/library/scala/collection/DefaultMap.scala
new file mode 100644
index 0000000000..c188c45a45
--- /dev/null
+++ b/src/library/scala/collection/DefaultMap.scala
@@ -0,0 +1,37 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Map.scala 17537 2009-04-20 18:37:37Z odersky $
+
+
+package scala.collection
+
+import generic._
+
+/* A default map which implements the `add` and `-` methods of maps.
+ * Instances that inherit from DefaultMap[A, B] still have to define:
+ *
+ *   def get(key: A): Option[B]
+ *   def elements: Iterator[(A, B)]
+ *
+ * It refers back to the original map.
+ *
+ * It might also be advisable to override `foreach` or `size` if efficient
+ * implementations can be found.
+ */
+trait DefaultMap[A, +B] extends Map[A, B] { self =>
+
+  /** A default implementation which creates a new immutable map.
+   */
+  override def add[B1 >: B](key: A, value: B1): Map[A, B1] =
+    Map[A, B1]() ++ this + ((key, value))
+
+  /** A default implementation which creates a new immutable map.
+   */
+  override def - (key: A): Map[A, B] = Map[A, B]() ++ this - key
+}
diff --git a/src/library/scala/collection/Iterable.scala b/src/library/scala/collection/Iterable.scala
new file mode 100755
index 0000000000..502e7d95f4
--- /dev/null
+++ b/src/library/scala/collection/Iterable.scala
@@ -0,0 +1,95 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
+
+package scala.collection
+
+import util.control.Breaks._
+// import immutable.Stream
+import generic._
+
+/** A template trait for iterable collections.
+ *
+ *  Collection classes mixing in this trait provide a method
+ *  <code>elements</code> which returns an iterator over all the
+ *  elements contained in the collection. They also provide a method `newBuilder`
+ *  which creates a builder for collections of the same kind.
+ *
+ *  This trait implements Traversible's `foreach` method by stepping through
+ *  all elements. Subclasses of `Iterable` should re-implement `foreach` with
+ *  something more efficient, if possible.
+ *
+ *  This trait adds methods `elements`, `zip`, `zipAll`, `zipWithIndex`, `sameElements`,
+ *  `takeRight`, `dropRight` to the methods inherited from trait `Traversible`.
+ *
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait Iterable[+A] extends Traversible[A] with IterableTemplate[A, Iterable[A]] {
+  override protected[this] def newBuilder = Iterable.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Iterable[B], Any] = Iterable.newBuilder[B]
+
+  /* The following methods are inherited from trait IterableTemplate
+   *
+  override def elements: Iterator[A]
+  override def takeRight(n: Int): Iterable[A]
+  override def dropRight(n: Int): Iterable[A]
+  override def sameElements[B >: A](that: Iterable[B]): Boolean
+  override def view
+  override def view(from: Int, until: Int)
+  */
+}
+
+/** Factory methods and utilities for instances of type Traversible */
+object Iterable extends TraversibleFactory[Iterable] {
+
+  type Coll	= Iterable[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Iterable[A], Coll] = new BuilderFactory[A, Iterable[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Iterable[A], Any] = immutable.Iterable.newBuilder[A]
+
+  def fromOld[A](it: scala.Iterable[A]): Iterable[A] = new Iterable[A] {
+    def elements: Iterator[A] = Iterator.fromOld(it.elements)
+  }
+
+  def toOld[A](it: Iterable[A]): scala.Iterable[A] = new scala.Iterable[A] {
+    def elements: scala.Iterator[A] = Iterator.toOld(it.elements)
+  }
+
+  /** The minimum element of a non-empty sequence of ordered elements
+   *  @deprecated use seq.min instead
+   */
+  @deprecated def min[A <% Ordered[A]](seq: Iterable[A]): A = {
+    val xs = seq.elements
+    if (!xs.hasNext) throw new IllegalArgumentException("min(<empty>)")
+    var min = xs.next
+    while (xs.hasNext) {
+      val x = xs.next
+      if (x < min) min = x
+    }
+    min
+  }
+
+  /** The maximum element of a non-empty sequence of ordered elements
+   *  @deprecated use seq.max iConstead
+   */
+  @deprecated def max[A <% Ordered[A]](seq: Iterable[A]): A = {
+    val xs = seq.elements
+    if (!xs.hasNext) throw new IllegalArgumentException("max(<empty>)")
+    var max = xs.next
+    while (xs.hasNext) {
+      val x = xs.next
+      if (max < x) max = x
+    }
+    max
+  }
+
+  /** @deprecated use View instead
+   */
+  @deprecated type Projection[A] = IterableView[A, Coll]
+}
diff --git a/src/library/scala/collection/immutable/EmptySet.scala b/src/library/scala/collection/IterableProxy.scala
index b687b92788..6bb12e84dc 100644
--- a/src/library/scala/collection/immutable/EmptySet.scala
+++ b/src/library/scala/collection/IterableProxy.scala
@@ -6,31 +6,20 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id$
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
 
 
+package scala.collection
 
-package scala.collection.immutable
-
-/** This class implements empty immutable sets
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class EmptySet[A] extends Set[A] {
-
-  def empty[C]: Set[C] = new EmptySet[C]
-
-  def size: Int = 0
-
-  def contains(elem: A): Boolean = false
-
-  def + (elem: A): Set[A] = new Set1(elem)
-
-  def - (elem: A): Set[A] = this
-
-  def elements: Iterator[A] = Iterator.empty
-}
+import generic._
 
+// Methods could be printed by  cat Traversibe.scala | egrep '^  (override )?def'
 
 
+/** This trait implements a proxy for iterable objects. It forwards
+ *  all calls to a different iterable object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait IterableProxy[+A] extends Iterable[A] with IterableProxyTemplate[A, Iterable[A]]
diff --git a/src/library/scalax/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala
index 48eda407aa..1853571e21 100755
--- a/src/library/scalax/collection/Iterator.scala
+++ b/src/library/scala/collection/Iterator.scala
@@ -9,10 +9,10 @@
 // $Id: Iterator.scala 15939 2008-08-26 14:33:17Z stepancheg $
 
 
-package scalax.collection
+package scala.collection
 
 import mutable.{Buffer, ArrayBuffer, ListBuffer}
-import immutable.{List, Nil, ::, Stream}
+// import immutable.{List, Nil, ::, Stream}
 
 /** The <code>Iterator</code> object provides various functions for
  *  creating specialized iterators.
@@ -23,15 +23,24 @@ import immutable.{List, Nil, ::, Stream}
  */
 object Iterator {
 
+  def fromOld[A](it: scala.Iterator[A]): Iterator[A] = new Iterator[A] {
+    def hasNext: Boolean = it.hasNext
+    def next: A = it.next
+  }
+
+  def toOld[A](it: Iterator[A]): scala.Iterator[A] = new scala.Iterator[A] {
+    def hasNext: Boolean = it.hasNext
+    def next: A = it.next
+  }
+
   val empty = new Iterator[Nothing] {
     def hasNext: Boolean = false
     def next(): Nothing = throw new NoSuchElementException("next on empty iterator")
   }
 
-  /**
+  /** An iterator with a single element.
    *  @param elem the element
-   *  @return  the iterator with one single element
-   *  @note  Equivalent, but more efficient than Iterator(x)
+   *  @note  Equivalent, but more efficient than Iterator(elem)
    */
   def single[A](elem: A) = new Iterator[A] {
     private var hasnext = true
@@ -41,21 +50,24 @@ object Iterator {
       else empty.next()
   }
 
-  def apply[A](args: A*): Iterator[A] = args.asInstanceOf[Iterable[A]].elements // !@!
+  /** Creates an iterator with given elements
+   *  @param elems  The elements returned one-by-one from the iterator
+   */
+  def apply[A](elems: A*): Iterator[A] = Iterable.fromOld(elems).elements
 
-  /** Concatenate all the argument iterators into a single iterator.
+  /** Concatenates the given argument iterators into a single iterator.
    *
-   *  @param xss the lists that are to be concatenated
-   *  @return the concatenation of all the lists
+   *  @param its the argument iterators that are to be concatenated
+   *  @return the concatenation of all the argument iterators
    */
   def concat[A](xss: Iterator[A]*): Iterator[A] =
-    xss.asInstanceOf[Iterable[Iterator[A]]].elements.flatten // !@!
+    Iterable.fromOld(xss).elements.flatten
 
-  /** An iterator that returns the same element a number of times
+  /** An iterator that returns the results of some element computation a number of times.
    *  @param   len  The number of elements returned
-   *  @param   elem The element returned each time
+   *  @param   elem The element computation determinining each result
    */
-  def fill[A](len: Int, elem: => A) = new Iterator[A] {
+  def fill[A](len: Int)(elem: => A) = new Iterator[A] {
     private var i = 0
     def hasNext: Boolean = i < len
     def next(): A =
@@ -63,41 +75,36 @@ object Iterator {
       else empty.next()
   }
 
-  /** An iterator that returns values of a function <code>f(0), ..., f(n-1)</code>,
-   *  for given `f` and `n`.
+  /** An iterator that returns values of a given function over a range of integer values starting from 0.
+   *  @param end   The argument up to which values are tabulated.
+   *  @param f     The function computing the results
+   *  @return  An iterator with values `f(0) ... f(end-1)`
    */
-  def tabulate[A](n: Int)(f: Int => A) = new Iterator[A] {
+  def tabulate[A](end: Int)(f: Int => A) = new Iterator[A] {
     private var i = 0
-    def hasNext: Boolean = i < n
+    def hasNext: Boolean = i < end
     def next(): A =
       if (hasNext) { val result = f(i); i += 1; result }
       else empty.next()
   }
 
- /** Nn iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + 1</code>
-   *  where <code>e<sub>0</sub> = start</code>
-   *  and <code>e<sub>i</sub> &lt; end</code>. However,
-   *  if <code>start &ge; end</code>, then it will return an empty range.
+ /** An iterator returning successive values in some integer interval.
    *
    *  @param start the start value of the iterator
-   *  @param end   the end value of the iterator
-   *  @return      the iterator with values in range <code>[start;end)</code>.
+   *  @param end   the end value of the iterator (the first value NOT returned)
+   *  @return      the iterator with values in range `start, start + 1, ..., end - 1`
    */
   def range(start: Int, end: Int): Iterator[Int] = range(start, end, 1)
 
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + step</code>
-   *  where <code>e<sub>0</sub> = start</code>
-   *  and elements are in the range between <code>start</code> (inclusive)
-   *  and <code>end</code> (exclusive)
-   *
+  /** An iterator returning equally spaced values in some integer interval.
+
    *  @param start the start value of the iterator
-   *  @param end   the end value of the iterator
+   *  @param end   the end value of the iterator (the first value NOT returned)
    *  @param step  the increment value of the iterator (must be positive or negative)
-   *  @return      the iterator with values in range <code>[start;end)</code>.
+   *  @return      the iterator with values in `start, start + step, ...` up to, but excluding `end`
    */
   def range(start: Int, end: Int, step: Int) = new Iterator[Int] {
+    if (step == 0) throw new IllegalArgumentException("zero step")
     private var i = start
     def hasNext: Boolean = (step <= 0 || i < end) && (step >= 0 || i > end)
     def next(): Int =
@@ -107,10 +114,10 @@ object Iterator {
 
   /** An iterator that repeatedly applies a given function to a start value.
    *
-   *  @param start the start value of the iteratpr
+   *  @param start the start value of the iterator
    *  @param len   the number of elements returned by the iterator
    *  @param f     the function that's repeatedly applied
-   *  @return      the iterator returning values <code>(start, f(start), f(f(start)), ..., f<sup>len-1</sup>(start))</code>
+   *  @return      the iterator returning `len` values in the sequence `start, f(start), f(f(start)), ...`
    */
   def iterate(start: Int, len: Int)(f: Int => Int) = new Iterator[Int] {
     private var acc = start
@@ -123,9 +130,9 @@ object Iterator {
 
   /** An infinite iterator that repeatedly applies a given function to a start value.
    *
-   *  @param start the start value of the iteratpr
+   *  @param start the start value of the iterator
    *  @param f     the function that's repeatedly applied
-   *  @return      the iterator returning values <code>(start, f(start), f(f(start)), ..., f<sup>len-1</sup>(start))</code>
+   *  @return      the iterator returning the infinite sequence of values `start, f(start), f(f(start)), ...`
    */
   def iterate(start: Int)(f: Int => Int) = new Iterator[Int] {
     private var acc = start
@@ -134,48 +141,44 @@ object Iterator {
     def next(): Int = { val result = f(acc); i += 1; result }
   }
 
-  /** Create an iterator with elements
-   *  <code>e<sub>n+1</sub> = e<sub>n</sub> + 1</code>
-   *  where <code>e<sub>0</sub> = start</code>.
-   *
+  /** An infinite-length iterator which returns successive values from some start value.
+
    *  @param start the start value of the iterator
-   *  @return      the iterator starting at value <code>start</code>.
+   *  @return      the iterator returning the infinite sequence of values `start, start + 1, start + 2, ...`
    */
   def from(start: Int): Iterator[Int] = from(start, 1)
 
-  /** Create an iterator with elements
-   * <code>e<sub>n+1</sub> = e<sub>n</sub> + step</code>
-   *  where <code>e<sub>0</sub> = start</code>.
+  /** An infinite-length iterator returning values equally spaced apart.
    *
    *  @param start the start value of the iterator
-   *  @param step  the increment value of the iterator
-   *  @return      the iterator starting at value <code>start</code>.
+   *  @param step  the increment between successive values
+   *  @return      the iterator returning the infinite sequence of values `start, start + 1 * step, start + 2 * step, ...`
    */
   def from(start: Int, step: Int): Iterator[Int] = new Iterator[Int] {
-    private var i = 0
+    private var i = start
     def hasNext: Boolean = true
-    def next(): Int = { val result = i; i += 1; result }
+    def next(): Int = { val result = i; i += step; result }
   }
 
+  /** A wrapper class for the `flatten `method that is added to class Iterator with implicit conversion @see iteratorIteratorWrapper.
+   */
   class IteratorIteratorOps[A](its: Iterator[Iterator[A]]) {
-    /** Create an iterator that is the concantenation of all iterators
-     *  returned by a given iterator of iterators.
-     *   @param its   The iterator which returns on each call to next
-     *                a new iterator whose elements are to be concatenated to the result.
+    /** If `its` is an iterator of iterators, `its.flatten` gives the iterator that is the concatenation of all iterators in `its`.
      */
     def flatten: Iterator[A] = new Iterator[A] {
-      private var it = its.next
-      def hasNext: Boolean = if (it.hasNext) { it = its.next; hasNext } else false
-      def next(): A = if (hasNext) it.next else empty.next()
+      private var it: Iterator[A] = empty
+      def hasNext: Boolean = it.hasNext || its.hasNext && { it = its.next(); hasNext }
+      def next(): A = if (hasNext) it.next() else empty.next()
     }
   }
 
+  /** An implicit conversion which adds the `flatten` method to class `Iterator` */
   implicit def iteratorIteratorWrapper[A](its: Iterator[Iterator[A]]): IteratorIteratorOps[A] =
     new IteratorIteratorOps[A](its)
 
-  /** @deprecated  use `xs.elements`, or `Iterator(x1, ..., xn)` instead
+  /** @deprecated  use `xs.elements` instead
    */
-  @deprecated def fromValues[a](xs: a*) = xs.elements
+  @deprecated def fromValues[a](xs: a*) = Iterable.fromOld(xs).elements
 
   /**
    *  @param xs the array of elements
@@ -193,7 +196,7 @@ object Iterator {
    *  @deprecated  use `xs.slice(start, start + length).elements` instead
    */
   @deprecated def fromArray[a](xs: Array[a], start: Int, length: Int): Iterator[a] =
-    xs.slice(start, start + length).elements.asInstanceOf[Iterator[a]] // !@!
+    Iterable.fromOld(xs.slice(start, start + length)).elements
 
   /**
    *  @param str the given string
@@ -201,7 +204,7 @@ object Iterator {
    *  @deprecated replaced by <code>str.elements</code>
    */
   @deprecated def fromString(str: String): Iterator[Char] =
-    str.elements.asInstanceOf[Iterator[Char]] // !@!
+    Iterable.fromOld(str).elements
 
   /**
    *  @param n the product arity
@@ -259,14 +262,13 @@ object Iterator {
    *   @deprecated  use its.flatten instead
    */
   @deprecated def flatten[T](its: Iterator[Iterator[T]]): Iterator[T] = new Iterator[T] {
-    private var it = its.next
+    private var cur = its.next
     def hasNext: Boolean = {
-      while (!it.hasNext && its.hasNext) it = its.next
-      it.hasNext
+      while (!cur.hasNext && its.hasNext) cur = its.next
+      cur.hasNext
     }
     def next(): T =
-      if (hasNext) it.next
-      else empty.next()
+      (if (hasNext) cur else empty).next()
   }
 }
 
@@ -280,19 +282,18 @@ import Iterator.empty
  *  @author  Martin Odersky, Matthias Zenger
  *  @version 2.8
  */
-trait Iterator[+A] {
-self =>
+trait Iterator[+A] { self =>
 
   /** Does this iterator provide another element?
    */
   def hasNext: Boolean
 
-  /** Returns the next element.
+  /** Returns the next element of this iterator.
    */
   def next(): A
 
   /** Returns a new iterator that iterates only over the first <code>n</code>
-   *  elements.
+   *  elements of this iterator, or the length of the iterator, whichever is smaller.
    *
    *  @param n the number of elements to take
    *  @return  the new iterator
@@ -302,19 +303,19 @@ self =>
     def hasNext = remaining > 0 && self.hasNext
     def next(): A =
       if (hasNext) { remaining -= 1; self.next }
-      else throw new NoSuchElementException("next on empty iterator")
+      else empty.next()
   }
 
-  /** Removes the first <code>n</code> elements from this iterator.
-   *
+  /** Advances this iterator past the first <code>n</code> elements,
+   *  or the length of the iterator, whichever is smaller.
    *  @param n the number of elements to drop
    *  @return  the new iterator
    */
   def drop(n: Int): Iterator[A] =
     if (n > 0 && hasNext) { next(); drop(n - 1) } else this
 
-  /** A sub-iterator of <code>until - from elements
-   *  starting at index <code>from</code>
+  /** Advances this iterator past the first `from` elements using `drop`,
+   *  and then takes `until - from` elements, using `take`.
    *
    *  @param from   The index of the first element of the slice
    *  @param until    The index of the element following the slice
@@ -331,21 +332,12 @@ self =>
 
   /** Returns a new iterator that first yields the elements of this
    *  iterator followed by the elements provided by iterator <code>that</code>.
-   *  @deprecated  use <code>++</code>
-   */
-  def append[B >: A](that: Iterator[B]) = new Iterator[B] {
-    def hasNext = self.hasNext || that.hasNext
-    def next() = (if (self.hasNext) self else that).next()
-  }
-
-  /** Returns a new iterator that first yields the elements of this
-   *  iterator followed by the elements provided by iterator <code>that</code>.
    */
   def ++[B >: A](that: => Iterator[B]) = new Iterator[B] {
     // optimize a little bit to prevent n log n behavior.
     var cur : Iterator[B] = self
     def hasNext = cur.hasNext || (cur eq self) && { cur = that; hasNext }
-    def next() = { hasNext; cur.next }
+    def next() = { hasNext; cur.next() }
   }
 
   /** Applies the given function <code>f</code> to each element of
@@ -383,8 +375,6 @@ self =>
    *  all elements of the result satisfy the predicate <code>p</code>.
    *  The order of the elements is preserved.
    *
-   *  The behavior of <code>this</code> iterator is undefined after this method invocation.
-   *
    *  @param p the predicate used to filter the iterator.
    *  @return  the longest prefix of this iterator satisfying <code>p</code>.
    */
@@ -413,8 +403,9 @@ self =>
         while (self.hasNext && !p(self.head)) {
           other.lookahead += self.next
         }
-      def hasNext = !lookahead.isEmpty || self.hasNext
-      def next() = if (lookahead.isEmpty) self.next() else lookahead.dequeue()
+      def hasNext = !lookahead.isEmpty || { skip(); self.hasNext }
+      def next() = if (!lookahead.isEmpty) lookahead.dequeue()
+                   else { skip(); self.next() }
     }
     val l = new PartitionIterator(p)
     val r = new PartitionIterator(!p(_))
@@ -426,8 +417,6 @@ self =>
   /** Skips longest sequence of elements of this iterator which satisfy given
    *  predicate <code>p</code>, and returns an iterator of the remaining elements.
    *
-   *  The behavior of <code>this</code> iterator is undefined after this method invocation.
-   *
    *  @param p the predicate used to skip elements.
    *  @return  an iterator consisting of the remaining elements
    */
@@ -450,23 +439,30 @@ self =>
    *  the element at the same position in the latter.
    *  If one of the two iterators is longer than the other, its remaining elements are ignored.
    *
-   *  @return     an iterator yielding <code>{a<sub>0</sub>,b<sub>0</sub>},
-   *              {a<sub>1</sub>,b<sub>1</sub>}, ...</code> where
-   *              <code>a<sub>i</sub></code> are the elements from this iterator
-   *              and <code>b<sub>i</sub></code> are the elements from iterator
-   *              <code>that</code>.
    */
   def zip[B](that: Iterator[B]) = new Iterator[(A, B)] {
     def hasNext = self.hasNext && that.hasNext
     def next = (self.next, that.next)
   }
 
+  /** Return a new iterator with a length equal or longer to `len`.
+   *  If the current iterator returns fewer than `len` elements
+   *  return `elem` until the required length `len` is reached.
+   */
+  def padTo[A1 >: A](len: Int, elem: A1) = new Iterator[A1] {
+    private var count = 0
+    def hasNext = self.hasNext || count < len
+    def next = {
+      count += 1
+      if (self.hasNext) self.next
+      else if (count <= len) elem
+      else empty.next
+    }
+  }
+
   /** Return an iterator that pairs each element of this iterator
    *  with its index, counting from 0.
    *
-   *  @return      an iterator yielding <code>{a<sub>0</sub>,0},
-   *               {a<sub>1</sub>,1}...</code> where <code>a<sub>i</sub></code>
-   *               are the elements from this iterator.
    */
   def zipWithIndex = new Iterator[(A, Int)] {
     var idx = 0
@@ -509,8 +505,8 @@ self =>
       }
   }
 
-  /** Apply a function <code>f</code> to all elements of this
-   *  iterable object.
+  /** Execute a function <code>f</code> for all elements of this
+   *  iterator.
    *
    *  @param  f   a function that is applied to every element.
    */
@@ -531,7 +527,7 @@ self =>
   }
 
   /** Apply a predicate <code>p</code> to all elements of this
-   *  iterable object and return true, iff there is at least one
+   *  iterable object and return true iff there is at least one
    *  element for which <code>p</code> yields <code>true</code>.
    *
    *  @param p the predicate
@@ -544,15 +540,13 @@ self =>
     res
   }
 
-  /** Tests if the given value <code>elem</code> is a member of this iterator.
+ /** Tests if the given value <code>elem</code> is a member of this iterator.
    *
    *  @param elem element whose membership has to be tested.
-   *  @return     <code>true</code> iff there is an element of this iterator which
-   *              is equal (w.r.t. <code>==</code>) to <code>elem</code>.
    */
-  def contains(elem: Any): Boolean = exists { _ == elem }
+  def contains(elem: Any): Boolean = exists(_ == elem)
 
-  /** Find and return the first element of the iterable object satisfying a
+  /** Find and return the first value returned by the iterator satisfying a
    *  predicate, if any.
    *
    *  @param p the predicate
@@ -568,7 +562,7 @@ self =>
     res
   }
 
-  /** Returns index of the first element satisying a predicate, or -1.
+  /** Returns index of the first element satisfying a predicate, or -1.
    *
    *  @note may not terminate for infinite-sized collections.
    *  @param  p the predicate
@@ -588,12 +582,6 @@ self =>
     if (found) i else -1
   }
 
-  /** Returns index of the first element satisying a predicate, or -1.
-   *
-   *  @deprecated use `indexWhere` instead
-   */
-  @deprecated def findIndexOf(p: A => Boolean): Int = indexWhere(p)
-
   /** Returns the index of the first occurence of the specified
    *  object in this iterable object.
    *
@@ -638,10 +626,8 @@ self =>
    *          if the iterator yields elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
    *          a<sub>n</sub></code>.
    */
-  def foldRight[B](z: B)(op: (A, B) => B): B = {
-    def fold(z: B): B = if (hasNext) op(next(), fold(z)) else z
-    fold(z)
-  }
+  def foldRight[B](z: B)(op: (A, B) => B): B =
+    if (hasNext) op(next(), foldRight(z)(op)) else z
 
   /** Similar to <code>foldLeft</code> but can be used as
    *  an operator with the order of iterator and zero arguments reversed.
@@ -690,8 +676,26 @@ self =>
    *  @throws Predef.UnsupportedOperationException if the iterator is empty.
    */
   def reduceRight[B >: A](op: (A, B) => B): B = {
-    if (!hasNext) throw new UnsupportedOperationException("empty.reduceRight")
-    foldRight[B](next())(op)
+    if (hasNext) foldRight[B](next())(op)
+    else throw new UnsupportedOperationException("empty.reduceRight")
+  }
+
+ /** Combines the elements of this iterator together using the binary
+   *  operator <code>op</code>, from left to right
+   *  @param op  The operator to apply
+   *  @return  If the iterable is non-empty, the result of the operations as an Option, otherwise None.
+   */
+  def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B] = {
+    if (!hasNext) None else Some(reduceLeft(op))
+  }
+
+ /** Combines the elements of this iterable object together using the binary
+   *  operator <code>op</code>, from right to left.
+   *  @param op  The operator to apply
+   *  @return  If the iterable is non-empty, the result of the operations as an Option, otherwise None.
+   */
+  def reduceRightOpt[B >: A](op: (A, B) => B): Option[B] = {
+    if (!hasNext) None else Some(reduceRight(op))
   }
 
   /** Returns a buffered iterator from this iterator.
@@ -718,6 +722,9 @@ self =>
       } else self.next
   }
 
+  /** Returns the number of elements in this iterator.
+   *  @note The iterator is at its end after this method returns.
+   */
   def length: Int = {
     var i = 0
     while (hasNext) {
@@ -726,65 +733,44 @@ self =>
     i
   }
 
-  /** Returns a counted iterator from this iterator.
-   *  @deprecated use @see zipWithIndex in Iterator
-   */
-  def counted = new CountedIterator[A] {
-    private var cnt = -1
-    def count = cnt
-    def hasNext: Boolean = self.hasNext
-    def next(): A = { cnt += 1; self.next }
-  }
-
   /** Creates two new iterators that both iterate over the same elements
-   *  than this iterator (in the same order).
+   *  as this iterator (in the same order).
    *
    *  @return a pair of iterators
    */
   def duplicate: (Iterator[A], Iterator[A]) = {
-    var xs: List[A] = Nil
+    val gap = new scala.collection.mutable.Queue[A]
     var ahead: Iterator[A] = null
     class Partner extends Iterator[A] {
-      var ys: List[A] = Nil
-      def hasNext: Boolean = self.synchronized (
-        ((this == ahead) && self.hasNext) ||
-        ((this != ahead) && (!xs.isEmpty || !ys.isEmpty || self.hasNext))
-      )
+      def hasNext: Boolean = self.synchronized {
+        (this ne ahead) && !gap.isEmpty || self.hasNext
+      }
       def next(): A = self.synchronized {
-        if (this == ahead) {
+        if (gap.isEmpty) ahead = this
+        if (this eq ahead) {
           val e = self.next()
-          xs = e :: xs; e
-        } else {
-          if (ys.isEmpty) {
-            ys = xs.reverse
-            xs = Nil
-          }
-          ys match {
-            case Nil =>
-              val e = self.next()
-              ahead = this
-              xs = e :: xs; e
-            case z :: zs =>
-              ys = zs; z
-          }
-        }
+          gap enqueue e
+          e
+        } else gap.dequeue
       }
     }
-    ahead = new Partner
-    (ahead, new Partner)
+    (new Partner, new Partner)
   }
 
-  def patch[B >: A](from: Int, ps: Sequence[B], replaced: Int) = new Iterator[B] {
-    private val plen = ps.length
+  /** Returns this iterator with patched values.
+   *  @param from     The start index from which to patch
+   *  @param ps       The iterator of patch values
+   *  @param replaced The number of values in the original iterator that are replaced by the patch.
+   */
+  def patch[B >: A](from: Int, patchElems: Iterator[B], replaced: Int) = new Iterator[B] {
     private var origElems = self
-    private val patchElems = ps.elements
     private var i = 0
     def hasNext: Boolean =
       if (i < from) origElems.hasNext
       else patchElems.hasNext || origElems.hasNext
     def next(): B = {
       val result: B =
-        if (i < from || i >= from + plen) origElems.next()
+        if (i < from || !patchElems.hasNext) origElems.next()
         else patchElems.next()
       i += 1
       if (i == from) origElems = origElems drop replaced
@@ -792,19 +778,17 @@ self =>
     }
   }
 
-  /** Fills the given array <code>xs</code> with at most `len` elements of
-   *  this iterator starting at position `start`.
-   *  Copying will stop once either the end of the current iterable is reached or
-   *  `len` elements have been copied.
+  /** Fills the given array `xs` with at most `len` elements of
+   *  this iterator starting at position `start` until either `len` elements have been copied,
+   *  or the end of the iterator is reached, or the end of the array `xs` is reached.
    *
    *  @param  xs the array to fill.
    *  @param  start starting index.
    *  @param  len number of elements to copy
-   *  @pre    the array must be large enough to hold all elements.
    */
   def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit = {
     var i = start
-    val end = start + len
+    val end = start + len min xs.length
     while (hasNext && i < end) {
       xs(i) = next()
       i += 1
@@ -817,7 +801,6 @@ self =>
    *
    *  @param  xs the array to fill.
    *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
    */
   def copyToArray[B >: A](xs: Array[B], start: Int): Unit =
     copyToArray(xs, start, xs.length - start)
@@ -827,44 +810,19 @@ self =>
    *  until either the end of the current iterator or the end of array `xs` is reached.
    *
    *  @param  xs the array to fill.
-   *  @pre    the array must be large enough to hold all elements.
    */
   def copyToArray[B >: A](xs: Array[B]): Unit = copyToArray(xs, 0, xs.length)
 
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.  Like <code>copyToArray</code>,
-   *  but designed to accomodate IO stream operations.
-   *
-   *  @param  xs    the array to fill.
-   *  @param  start the starting index.
-   *  @param  sz    the maximum number of elements to be read.
-   *  @pre          the array must be large enough to hold <code>sz</code> elements.
-   *  @deprecated   use copyToArray instead
-   */
-  @deprecated def readInto[B >: A](xs: Array[B], start: Int, sz: Int) {
-    var i = start
-    while (hasNext && i - start < sz) {
-      xs(i) = next
-      i += 1
-    }
-  }
-  @deprecated def readInto[B >: A](xs: Array[B], start: Int) {
-    readInto(xs, start, xs.length - start)
-  }
-  @deprecated def readInto[B >: A](xs: Array[B]) {
-    readInto(xs, 0, xs.length)
-  }
-
   /** Copy all elements to a buffer
-   *  @param   The buffer to which elements are copied
+   *  @param  dest The buffer to which elements are copied
    */
   def copyToBuffer[B >: A](dest: Buffer[B]) {
     while (hasNext) dest += next
   }
 
-  /** Transform this iterator into a list of all elements.
+  /** Traverse this iterator and return all elements in a list.
    *
-   *  @return  a list which enumerates all elements of this iterator.
+   *  @return  A list which enumerates all elements of this iterator.
    */
   def toList: List[A] = {
     val res = new ListBuffer[A]
@@ -872,32 +830,27 @@ self =>
     res.toList
   }
 
-  /**
-   *  Create a stream which contains all the elements of this iterator.
+   /** Traverse this iterator and return all elements in a stream.
+   *
+   *  @return  A stream which enumerates all elements of this iterator.
    */
   def toStream: Stream[A] =
     if (hasNext) Stream.cons(next, toStream) else Stream.empty
 
-  /**
-   *  Create a sequence which contains all the elements of this iterator.
+  /** Traverse this iterator and return all elements in a sequence.
+   *
+   *  @return  A sequence which enumerates all elements of this iterator.
    */
   def toSequence: Sequence[A] = {
     val buffer = new ArrayBuffer[A]
     this copyToBuffer buffer
-    buffer.readOnly
+    buffer
   }
 
-  /** Collect elements into a seq.
-   *
-   * @return  a sequence which enumerates all elements of this iterator.
-   * @deprecated  use toSequence instead
-   */
-  @deprecated def collect: Sequence[A] = toSequence
-
   /** Returns a string representation of the elements in this iterator. The resulting string
    *  begins with the string <code>start</code> and is finished by the string
    *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
+   *  the method <code>toString</code>) are separated by the string
    *  <code>sep</code>.
    *  <p/>
    *  Ex: <br/>
@@ -920,16 +873,15 @@ self =>
    *  @param sep separator string.
    *  @return a string representation of this iterable object.
    */
-  def mkString(sep: String): String = this.mkString("", sep, "")
+  def mkString(sep: String): String = mkString("", sep, "")
 
   /** Returns a string representation of this iterable object. The string
    *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by a comma.
+   *  are concatenated without any separator string.
    *
    *  @return a string representation of this iterable object.
    */
-  def mkString: String =
-    mkString("")
+  def mkString: String = mkString("")
 
   /** Write all elements of this iterator into given string builder.
    *  The written text begins with the string <code>start</code> and is finished by the string
@@ -951,15 +903,68 @@ self =>
    *  The string representations of elements (w.r.t. the method <code>toString()</code>)
    *  are separated by the string <code>sep</code>.
    */
-  def addString(buf: StringBuilder, sep: String): StringBuilder =
-    addString(buf, "", sep, "")
+  def addString(buf: StringBuilder, sep: String): StringBuilder = addString(buf, "", sep, "")
 
   /** Write all elements of this string into given string builder without using
    *  any separator between consecutive elements.
    */
-  def addString(buf: StringBuilder): StringBuilder =
-    addString(buf, "", "", "")
+  def addString(buf: StringBuilder): StringBuilder = addString(buf, "", "", "")
 
   override def toString = (if (hasNext) "non-empty" else "empty")+" iterator"
 
+ /** Returns a new iterator that first yields the elements of this
+   *  iterator followed by the elements provided by iterator <code>that</code>.
+   *  @deprecated  use <code>++</code>
+   */
+  @deprecated def append[B >: A](that: Iterator[B]) = new Iterator[B] {
+    def hasNext = self.hasNext || that.hasNext
+    def next() = (if (self.hasNext) self else that).next()
+  }
+
+  /** Returns index of the first element satisfying a predicate, or -1.
+   *
+   *  @deprecated use `indexWhere` instead
+   */
+  @deprecated def findIndexOf(p: A => Boolean): Int = indexWhere(p)
+
+  /** Collect elements into a seq.
+   *
+   * @return  a sequence which enumerates all elements of this iterator.
+   * @deprecated  use toSequence instead
+   */
+  @deprecated def collect: Sequence[A] = toSequence
+
+  /** Returns a counted iterator from this iterator.
+   *  @deprecated use @see zipWithIndex in Iterator
+   */
+  @deprecated def counted = new CountedIterator[A] {
+    private var cnt = -1
+    def count = cnt
+    def hasNext: Boolean = self.hasNext
+    def next(): A = { cnt += 1; self.next }
+  }
+
+  /** Fills the given array <code>xs</code> with the elements of
+   *  this sequence starting at position <code>start</code>.  Like <code>copyToArray</code>,
+   *  but designed to accomodate IO stream operations.
+   *
+   *  @param  xs    the array to fill.
+   *  @param  start the starting index.
+   *  @param  sz    the maximum number of elements to be read.
+   *  @pre          the array must be large enough to hold <code>sz</code> elements.
+   *  @deprecated   use copyToArray instead
+   */
+  @deprecated def readInto[B >: A](xs: Array[B], start: Int, sz: Int) {
+    var i = start
+    while (hasNext && i - start < sz) {
+      xs(i) = next
+      i += 1
+    }
+  }
+  @deprecated def readInto[B >: A](xs: Array[B], start: Int) {
+    readInto(xs, start, xs.length - start)
+  }
+  @deprecated def readInto[B >: A](xs: Array[B]) {
+    readInto(xs, 0, xs.length)
+  }
 }
diff --git a/src/library/scala/collection/JavaConversions.scala b/src/library/scala/collection/JavaConversions.scala
new file mode 100644
index 0000000000..d28959d857
--- /dev/null
+++ b/src/library/scala/collection/JavaConversions.scala
@@ -0,0 +1,484 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id$
+
+package scala.collection
+
+/**
+ * A collection of implicit conversions supporting interoperability between Scala and Java
+ * collections.
+ * <p>
+ * The following conversions are supported,
+ * <p>
+ * <ul>
+ *   <li><code>scala.collection.Iterable</code> <=> <code>java.lang.Iterable</code></li>
+ *   <li><code>scala.collection.Iterable</code> <=> <code>java.util.Collection</code></li>
+ *   <li><code>scala.collection.Iterator</code> <=> <code>java.util.{ Iterator, Enumeration }</code></li>
+ *   <li<code>>scala.collection.mutable.Buffer</code> <=> <code>java.util.List</code></li>
+ *   <li<code>>scala.collection.mutable.Set</code> <=> <code>java.util.Set</code></li>
+ *   <li<code>>scala.collection.mutable.Map</code> <=> <code>java.util.Map</code></li>
+ * <ul>
+ * <p>
+ * In all cases, converting from a source type to a target type and back again will return
+ * the original source object, eg.
+ * <p>
+ * <pre>
+ * import scala.collections.jcl.Conversions._
+ *
+ * val sl = new scala.collection.mutable.ListBuffer[Int]
+ * val jl : java.util.List[Int] = sl
+ * val sl2 : scala.collection.mutable.Buffer[Int] = jl
+ * assert(sl eq sl2)g
+ * </pre>
+ *
+ * <p>
+ * Note that no conversion is provided from scala.collection.immutable.List to java.util.List.
+ * Instead it is convertible to an immutable java.util.Collection which provides size and
+ * interation capabilities, but not access by index as would be provided by java.util.List.
+ * This is intentional: in combination the implementation of scala.collection.immutable.List
+ * and the typical usage patterns of java.util.List would perform extremely poorly.
+ *
+ * @author Miles Sabin
+ */
+object JavaConversions {
+  import java.{ lang => jl, util => ju }
+  import scala.collection.{ generic, immutable, mutable, Traversible }
+  import scala.reflect.Manifest
+
+  // Scala => Java
+
+  /**
+   * Implicitly converts a Scala <code>Iterator</code> to a Java <code>Iterator</code>.
+   * The returned Java <code>Iterator</code> is backed by the provided Scala
+   * <code>Iterator</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Iterator</code> was previously obtained from an implicit or
+   * explicit call of <code>asIterator(java.util.Iterator)</code> then the original
+   * Java <code>Iterator</code> will be returned.
+   *
+   * @param i The <code>Iterator</code> to be converted.
+   * @return A Java <code>Iterator</code> view of the argument.
+   */
+  implicit def asIterator[A](i : Iterator[A]) = i match {
+    case JIteratorWrapper(wrapped) => wrapped
+    case _ => IteratorWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Scala <code>Iterator</code> to a Java <code>Enumeration</code>.
+   * The returned Java <code>Enumeration</code> is backed by the provided Scala
+   * <code>Iterator</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Iterator</code> was previously obtained from an implicit or
+   * explicit call of <code>asIterator(java.util.Enumeration)</code> then the
+   * original Java <code>Enumeration</code> will be returned.
+   *
+   * @param i The <code>Iterator</code> to be converted.
+   * @return A Java <code>Enumeration</code> view of the argument.
+   */
+  implicit def asEnumeration[A](i : Iterator[A]) = i match {
+    case JEnumerationWrapper(wrapped) => wrapped
+    case _ => IteratorWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Scala <code>Iterable</code> to a Java <code>Iterable</code>.
+   * The returned Java <code>Iterable</code> is backed by the provided Scala
+   * <code>Iterable</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Iterable</code> was previously obtained from an implicit or
+   * explicit call of <code>asIterable(java.lang.Iterable)</code> then the original
+   * Java <code>Iterable</code> will be returned.
+   *
+   * @param i The <code>Iterable</code> to be converted.
+   * @return A Java <code>Iterable</code> view of the argument.
+   */
+  implicit def asIterable[A](i : Iterable[A]) = i match {
+    case JIterableWrapper(wrapped) => wrapped
+    case _ => IterableWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Scala <code>Iterable</code> to an immutable Java
+   * <code>Collection</code>.
+   * <p>
+   * If the Scala <code>Iterable</code> was previously obtained from an implicit or
+   * explicit call of <code>asSizedIterable(java.util.Collection)</code> then the original
+   * Java <code>Collection</code> will be returned.
+   *
+   * @param i The <code>SizedIterable</code> to be converted.
+   * @return A Java <code>Collection</code> view of the argument.
+   */
+  implicit def asCollection[A](i : Iterable[A]) = i match {
+    case JCollectionWrapper(wrapped) => wrapped
+    case _ => new IterableWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Scala mutable <code>Buffer</code> to a Java <code>List</code>.
+   * The returned Java <code>List</code> is backed by the provided Scala
+   * <code>Buffer</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Buffer</code> was previously obtained from an implicit or
+   * explicit call of <code>asBuffer(java.util.List)</code> then the original
+   * Java <code>List</code> will be returned.
+   *
+   * @param b The <code>Buffer</code> to be converted.
+   * @return A Java <code>List</code> view of the argument.
+   */
+  implicit def asList[A](b : mutable.Buffer[A]) : ju.List[A] = b match {
+    case JListWrapper(wrapped) => wrapped
+    case _ => new MutableBufferWrapper(b)
+  }
+
+  /**
+   * Implicitly converts a Scala mutable <code>Set</code> to a Java <code>Set</code>.
+   * The returned Java <code>Set</code> is backed by the provided Scala
+   * <code>Set</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Set</code> was previously obtained from an implicit or
+   * explicit call of <code>asSet(java.util.Set)</code> then the original
+   * Java <code>Set</code> will be returned.
+   *
+   * @param s The <code>Set</code> to be converted.
+   * @return A Java <code>Set</code> view of the argument.
+   */
+  implicit def asSet[A](s : mutable.Set[A])(implicit m : Manifest[A]) : ju.Set[A] = s match {
+    case JSetWrapper(wrapped) => wrapped
+    case _ => new MutableSetWrapper(s)(m)
+  }
+
+  /**
+   * Implicitly converts a Scala mutable <code>Map</code> to a Java <code>Map</code>.
+   * The returned Java <code>Map</code> is backed by the provided Scala
+   * <code>Map</code> and any side-effects of using it via the Java interface will
+   * be visible via the Scala interface and vice versa.
+   * <p>
+   * If the Scala <code>Map</code> was previously obtained from an implicit or
+   * explicit call of <code>asMap(java.util.Map)</code> then the original
+   * Java <code>Map</code> will be returned.
+   *
+   * @param m The <code>Map</code> to be converted.
+   * @return A Java <code>Map</code> view of the argument.
+   */
+  implicit def asMap[A, B](m : mutable.Map[A, B])(implicit ma : Manifest[A]) : ju.Map[A, B] = m match {
+    case JMapWrapper(wrapped) => wrapped
+    case _ => new MutableMapWrapper(m)(ma)
+  }
+
+  // Java => Scala
+
+  /**
+   * Implicitly converts a Java <code>Iterator</code> to a Scala <code>Iterator</code>.
+   * The returned Scala <code>Iterator</code> is backed by the provided Java
+   * <code>Iterator</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>Iterator</code> was previously obtained from an implicit or
+   * explicit call of <code>asIterator(scala.collection.Iterator)</code> then the original
+   * Scala <code>Iterator</code> will be returned.
+   *
+   * @param i The <code>Iterator</code> to be converted.
+   * @return A Scala <code>Iterator</code> view of the argument.
+   */
+  implicit def asIterator[A](i : ju.Iterator[A]) = i match {
+    case IteratorWrapper(wrapped) => wrapped
+    case _ => JIteratorWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Java <code>Enumeration</code> to a Scala <code>Iterator</code>.
+   * The returned Scala <code>Iterator</code> is backed by the provided Java
+   * <code>Enumeration</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>Enumeration</code> was previously obtained from an implicit or
+   * explicit call of <code>asEnumeration(scala.collection.Iterator)</code> then the
+   * original Scala <code>Iterator</code> will be returned.
+   *
+   * @param i The <code>Enumeration</code> to be converted.
+   * @return A Scala <code>Iterator</code> view of the argument.
+   */
+  implicit def asIterator[A](i : ju.Enumeration[A]) = i match {
+    case IteratorWrapper(wrapped) => wrapped
+    case _ => JEnumerationWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Java <code>Iterable</code> to a Scala <code>Iterable</code>.
+   * The returned Scala <code>Iterable</code> is backed by the provided Java
+   * <code>Iterable</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>Iterable</code> was previously obtained from an implicit or
+   * explicit call of <code>asIterable(scala.collection.Iterable)</code> then the original
+   * Scala <code>Iterable</code> will be returned.
+   *
+   * @param i The <code>Iterable</code> to be converted.
+   * @return A Scala <code>Iterable</code> view of the argument.
+   */
+  implicit def asIterable[A](i : jl.Iterable[A]) = i match {
+    case IterableWrapper(wrapped) => wrapped
+    case _ => JIterableWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Java <code>Collection</code> to an Scala <code>Iterable</code>.
+   * <p>
+   * If the Java <code>Collection</code> was previously obtained from an implicit or
+   * explicit call of <code>asCollection(scala.collection.SizedIterable)</code> then
+   * the original Scala <code>SizedIterable</code> will be returned.
+   *
+   * @param i The <code>Collection</code> to be converted.
+   * @return A Scala <code>SizedIterable</code> view of the argument.
+   */
+  implicit def asIterable[A](i : ju.Collection[A]) = i match {
+    case IterableWrapper(wrapped) => wrapped
+    case _ => JCollectionWrapper(i)
+  }
+
+  /**
+   * Implicitly converts a Java <code>List</code> to a Scala mutable <code>Buffer</code>.
+   * The returned Scala <code>Buffer</code> is backed by the provided Java
+   * <code>List</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>List</code> was previously obtained from an implicit or
+   * explicit call of <code>asList(scala.collection.mutable.Buffer)</code> then the original
+   * Scala <code>Buffer</code> will be returned.
+   *
+   * @param l The <code>List</code> to be converted.
+   * @return A Scala mutable <code>Buffer</code> view of the argument.
+   */
+  implicit def asBuffer[A](l : ju.List[A]) = l match {
+    case MutableBufferWrapper(wrapped) => wrapped
+    case _ =>new JListWrapper(l)
+  }
+
+  /**
+   * Implicitly converts a Java <code>Set</code> to a Scala mutable <code>Set</code>.
+   * The returned Scala <code>Set</code> is backed by the provided Java
+   * <code>Set</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>Set</code> was previously obtained from an implicit or
+   * explicit call of <code>asSet(scala.collection.mutable.Set)</code> then the original
+   * Scala <code>Set</code> will be returned.
+   *
+   * @param s The <code>Set</code> to be converted.
+   * @return A Scala mutable <code>Set</code> view of the argument.
+   */
+  implicit def asSet[A](s : ju.Set[A]) = s match {
+    case MutableSetWrapper(wrapped) => wrapped
+    case _ =>new JSetWrapper(s)
+  }
+
+  /**
+   * Implicitly converts a Java <code>Map</code> to a Scala mutable <code>Map</code>.
+   * The returned Scala <code>Map</code> is backed by the provided Java
+   * <code>Map</code> and any side-effects of using it via the Scala interface will
+   * be visible via the Java interface and vice versa.
+   * <p>
+   * If the Java <code>Map</code> was previously obtained from an implicit or
+   * explicit call of <code>asMap(scala.collection.mutable.Map)</code> then the original
+   * Scala <code>Map</code> will be returned.
+   *
+   * @param m The <code>Map</code> to be converted.
+   * @return A Scala mutable <code>Map</code> view of the argument.
+   */
+  implicit def asMap[A, B](m : ju.Map[A, B]) = m match {
+    case MutableMapWrapper(wrapped) => wrapped
+    case _ =>new JMapWrapper(m)
+  }
+
+  // Private implementations ...
+
+  case class IteratorWrapper[A](underlying : Iterator[A]) extends ju.Iterator[A] with ju.Enumeration[A] {
+    def hasNext = underlying.hasNext
+    def next = underlying.next
+    def hasMoreElements = underlying.hasNext
+    def nextElement = underlying.next
+    def remove = throw new UnsupportedOperationException
+  }
+
+  case class JIteratorWrapper[A](underlying : ju.Iterator[A]) extends Iterator[A] {
+    def hasNext = underlying.hasNext
+    def next = underlying.next
+  }
+
+  case class JEnumerationWrapper[A](underlying : ju.Enumeration[A]) extends Iterator[A] {
+    def hasNext = underlying.hasMoreElements
+    def next = underlying.nextElement
+  }
+
+  case class IterableWrapper[A](underlying : Iterable[A]) extends ju.AbstractCollection[A] {
+    def iterator = underlying.elements
+    def size = underlying.size
+    override def isEmpty = underlying.isEmpty
+  }
+
+  case class JIterableWrapper[A](underlying : jl.Iterable[A]) extends Iterable[A] {
+    def elements = underlying.iterator
+    def newBuilder[B] = new mutable.ArrayBuffer[B]
+  }
+
+  case class JCollectionWrapper[A](underlying : ju.Collection[A]) extends Iterable[A] {
+    def elements = underlying.iterator
+    override def size = underlying.size
+    override def isEmpty = underlying.isEmpty
+    def newBuilder[B] = new mutable.ArrayBuffer[B]
+  }
+
+  case class MutableBufferWrapper[A](underlying : mutable.Buffer[A]) extends ju.AbstractList[A] {
+    def size = underlying.length
+    def get(i : Int) = underlying(i)
+    override def set(i : Int, elem: A) = { val p = underlying(i) ; underlying(i) = elem ; p }
+    override def add(elem : A) = { underlying.append(elem) ; true }
+    override def remove(i : Int) = underlying.remove(i)
+  }
+
+  case class JListWrapper[A](val underlying : ju.List[A]) extends mutable.Buffer[A] {
+    def length = underlying.size
+    override def isEmpty = underlying.isEmpty
+    override def elements : Iterator[A] = underlying.iterator
+    def apply(i : Int) = underlying.get(i)
+    def update(i : Int, elem : A) = underlying.set(i, elem)
+    def +:(elem : A) = { underlying.subList(0, 0).add(elem) ; this }
+    def +=(elem : A) = underlying.add(elem)
+    def insertAll(i : Int, elems : Traversible[A]) = { val ins = underlying.subList(0, i) ;  elems.foreach(ins.add(_)) }
+    def remove(i : Int) = underlying.remove(i)
+    def clear = underlying.clear
+    def result = this
+  }
+
+  case class MutableSetWrapper[A](underlying : mutable.Set[A])(m : Manifest[A]) extends ju.AbstractSet[A] {
+    self =>
+    def size = underlying.size
+    override def add(elem: A) = { val sz = underlying.size ; underlying += elem ; sz < underlying.size }
+    override def remove(elem : AnyRef) = {
+      m.erasure.isInstance(elem) && {
+        val sz = underlying.size
+        underlying -= elem.asInstanceOf[A]
+        sz > underlying.size
+      }
+    }
+    def iterator = new ju.Iterator[A] {
+      val ui = underlying.elements
+      var prev : Option[A] = None
+
+      def hasNext = ui.hasNext
+      def next = { val e = ui.next ; prev = Some(e) ; e }
+      def remove = prev match {
+        case Some(e) => self.remove(e.asInstanceOf[AnyRef]) ; prev = None
+        case _ => throw new IllegalStateException("next must be called at least once before remove")
+      }
+    }
+  }
+
+  case class JSetWrapper[A](underlying : ju.Set[A]) extends mutable.Set[A] with generic.SetTemplate[A, JSetWrapper[A]] {
+    override def size = underlying.size
+
+    def elements = underlying.iterator
+
+    def contains(elem: A): Boolean = underlying.contains(elem)
+
+    def +=(elem: A) { underlying.add(elem) }
+
+    def -=(elem: A) { underlying.remove(elem) }
+
+    override def clear = underlying.clear
+
+    override def empty = JSetWrapper(new ju.HashSet[A])
+  }
+
+  case class MutableMapWrapper[A, B](underlying : mutable.Map[A, B])(m : Manifest[A]) extends ju.AbstractMap[A, B] {
+    self =>
+    override def size = underlying.size
+
+    override def put(k : A, v : B) = underlying.put(k, v) match {
+      case Some(v1) => v1
+      case None => null.asInstanceOf[B]
+    }
+
+    override def remove(k : AnyRef) = {
+      if (!m.erasure.isInstance(k))
+        null.asInstanceOf[B]
+      else {
+        val k1 = k.asInstanceOf[A]
+        underlying.get(k1) match {
+          case Some(v) => underlying -= k1 ; v
+          case None => null.asInstanceOf[B]
+        }
+      }
+    }
+
+    override def entrySet : ju.Set[ju.Map.Entry[A, B]] = new ju.AbstractSet[ju.Map.Entry[A, B]] {
+      def size = self.size
+
+      def iterator = new ju.Iterator[ju.Map.Entry[A, B]] {
+        val ui = underlying.elements
+        var prev : Option[A] = None
+
+        def hasNext = ui.hasNext
+
+        def next = {
+          val (k, v) = ui.next
+          prev = Some(k)
+          new ju.Map.Entry[A, B] {
+            def getKey = k
+            def getValue = v
+            def setValue(v1 : B) = self.put(k, v1)
+            override def equals(other : Any) = other match {
+              case e : ju.Map.Entry[_, _] => k == e.getKey && v == e.getValue
+              case _ => false
+            }
+          }
+        }
+
+        def remove = prev match {
+          case Some(k) => val v = self.remove(k.asInstanceOf[AnyRef]) ; prev = None ; v
+          case _ => throw new IllegalStateException("next must be called at least once before remove")
+        }
+      }
+    }
+  }
+
+  case class JMapWrapper[A, B](underlying : ju.Map[A, B]) extends mutable.Map[A, B] with generic.MutableMapTemplate[A, B, JMapWrapper[A, B]] {
+    override def size = underlying.size
+
+    def get(k : A) = {
+      val v = underlying.get(k)
+      if (v != null)
+        Some(v)
+      else if(underlying.containsKey(k))
+        Some(null.asInstanceOf[B])
+      else
+        None
+    }
+
+    def update(k : A, v : B) { underlying.put(k, v) }
+
+    def -=(k : A) = { underlying.remove(k) ; this }
+
+    def elements = new Iterator[(A, B)] {
+      val ui = underlying.entrySet.iterator
+      def hasNext = ui.hasNext
+      def next = { val e = ui.next ; (e.getKey, e.getValue) }
+    }
+
+    override def clear = underlying.clear
+
+    override def empty = JMapWrapper(new ju.HashMap[A, B])
+  }
+}
diff --git a/src/library/scala/collection/LinearSequence.scala b/src/library/scala/collection/LinearSequence.scala
new file mode 100755
index 0000000000..fc8d5e9a07
--- /dev/null
+++ b/src/library/scala/collection/LinearSequence.scala
@@ -0,0 +1,38 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection
+
+import mutable.ListBuffer
+// import immutable.{List, Nil, ::}
+import generic._
+import util.control.Breaks._
+
+/** Class <code>Linear[A]</code> represents linear sequences of elements.
+ *  For such sequences `isEmpty`, `head` and `tail` are guaranteed to be
+ *  efficient constant time (or near so) operations.
+ *  It does not add any methods to Sequence but overrides several
+ *  methods with optimized implementations.
+ *
+ *  @author  Martin Odersky
+ *  @author  Matthias Zenger
+ *  @version 1.0, 16/07/2003
+ */
+trait LinearSequence[+A] extends Sequence[A] with LinearSequenceTemplate[A, LinearSequence[A]] {
+  override protected[this] def newBuilder = LinearSequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, LinearSequence[B], Any] = LinearSequence.newBuilder[B]
+}
+
+object LinearSequence extends SequenceFactory[LinearSequence] {
+  type Coll = LinearSequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, LinearSequence[A], Coll] = new BuilderFactory[A, LinearSequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, LinearSequence[A], Any] = immutable.LinearSequence.newBuilder[A]
+}
diff --git a/src/library/scala/collection/Map.scala b/src/library/scala/collection/Map.scala
index ba465efa8b..66c8a78666 100644
--- a/src/library/scala/collection/Map.scala
+++ b/src/library/scala/collection/Map.scala
@@ -11,188 +11,42 @@
 
 package scala.collection
 
-import Predef._
+import generic._
 
-object Map {
-  trait Projection[A, +B] extends Iterable.Projection[(A, B)] with Map[A, B]
-}
-
-
-/** <p>
-*     A map is a collection that maps each key to one or zero values.
- *  </p>
- *  <p>
- *    This trait provides a limited interface, only allowing reading of elements.
- *    There are two extensions of this trait, in packages
- *    <code><a href="mutable$content.html" target="contentFrame">
- *    scala.collection.mutable</a></code>
- *    and <code><a href="immutable$content.html" target="contentFrame">
- *    scala.collection.immutable</a></code>, which provide functionality for
- *    adding new key/value mappings to a map. The trait in the first package is
- *    for maps that are modified destructively, whereas the trait in
- *    the second package is for immutable maps which create a new map
- *    when something is added or removed from them.
- *  </p>
+/** A map from keys of type A to values of type B.
+ *  To implement a concrete map, you need to provide implementations of the following methods:
+ *  (where This is the type of the map in question):
+ *
+ *   def get(key: A): Option[B]
+ *   def elements: Iterator[(A, B)]
+ *   def add[B1 >: B](key: A, value: B1): This
+ *   def -(key: A): This
+ *
+ * If you wish that methods like, take, drop, filter return the same kind of map, you should also
+ * override:
+ *
+ *   def empty: This
  *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 1.2, 31/12/2006
+ * It might also be a good idea to override methods foreach and size for efficiency.
+ *
+ * @note If you do not have speicifc implementations for `add` and `-` in mind, you
+ *       might consider inheriting from `DefaultMap` instead.
+ *
+ * @note Of you additions and mutations return the same kind of map as the map you are defining,
+ *       you should inherit from `MapTemplate` as well.
  */
-trait Map[A, +B] extends PartialFunction[A, B] with Collection[(A, B)] {
-
-  /** Compute the number of key-to-value mappings.
-   *
-   *  @return the number of mappings
-   */
-  def size: Int
-
-  /** Check if this map maps <code>key</code> to a value and return the
-   *  value if it exists.
-   *
-   *  @param  key the key of the mapping of interest
-   *  @return     the value of the mapping, if it exists
-   */
-  def get(key: A): Option[B]
-
-  /** Check if this map maps <code>key</code> to a value.
-    *  Return that value if it exists, otherwise return <code>default</code>.
-    */
-  def getOrElse[B2 >: B](key: A, default: => B2): B2 =
-    get(key) match {
-      case Some(v) => v
-      case None => default
-    }
-
-  /** Is this an empty map?
-   *
-   *  @return <code>true</code> iff the map is empty.
-   */
-  override def isEmpty: Boolean = size == 0
+trait Map[A, +B] extends Iterable[(A, B)] with MapTemplate[A, B, Map[A, B]] {
+  def empty: Map[A, B] = Map.empty
 
-  /** Retrieve the value which is associated with the given key. This
-   *  method throws an exception if there is no mapping from the given
-   *  key to a value.
-   *
-   *  @param  key the key
-   *  @return     the value associated with the given key.
-   */
-  def apply(key: A): B = get(key) match {
-    case None => default(key)
-    case Some(value) => value
-  }
+  override protected[this] def newBuilder : Builder[(A, B), Map[A, B], Any] =
+    throw new UnsupportedOperationException("Map.newBuilder")
 
-  /** Is the given key mapped to a value by this map?
-   *
-   *  @param key the key
-   *  @return    <code>true</code> iff there is a mapping for key in this map
-   */
-  def contains(key: A): Boolean = get(key) match {
-    case None => false
-    case Some(_) => true
-  }
-
-  /** Does this map contain a mapping from the given key to a value?
-   *
-   *  @param key the key
-   *  @return    <code>true</code> iff there is a mapping for key in this map
-   */
-  def isDefinedAt(key: A) = contains(key)
-
-  /** Creates an iterator for all keys.
-   *
-   *  @return an iterator over all keys.
-   */
-  def keys: Iterator[A] = new Iterator[A] {
-    val iter = Map.this.elements
-    def hasNext = iter.hasNext
-    def next = iter.next._1
-  }
-
-  /** @return the keys of this map as a set.
-   */
-  def keySet: Set[A] = new Set[A] {
-    def size = Map.this.size
-    def contains(key : A) = Map.this.contains(key)
-    def elements = Map.this.elements.map(_._1)
-  }
-
-  /** Creates an iterator for a contained values.
-   *
-   *  @return an iterator over all values.
-   */
-  def values: Iterator[B] = new Iterator[B] {
-    val iter = Map.this.elements
-    def hasNext = iter.hasNext
-    def next = iter.next._2
-  }
-
-  /** Compares two maps structurally; i.e. checks if all mappings
-   *  contained in this map are also contained in the other map,
-   *  and vice versa.
-   *
-   *  @param that the other map
-   *  @return     <code>true</code> iff both maps contain exactly the
-   *              same mappings.
-   */
-  override def equals(that: Any): Boolean = that match {
-    case other: Map[a, b] =>
-      this.size == other.size && this.elements.forall {
-        case (key, value) => other.get(key.asInstanceOf[a]) match {
-          case None => false
-          case Some(otherval) => value == otherval
-        }
-      }
-    case _ => false
-  }
-
-  /** A hash method compatible with <code>equals</code>
-   */
-  override def hashCode() =
-    (0 /: elements) ((hash, kv) => hash + kv.hashCode)
-
-
-  /** Creates a string representation for this map.
-   *
-   *  @return    a string showing all mappings
-   */
-  override def toString() =
-    elements.toList.map(kv => kv._1 + " -> " + kv._2).mkString(stringPrefix + "(", ", ", ")")
-
-  /** The default value for the map, returned when a key is not found
-   *  The method implemented here yields an error,
-   *  but it might be overridden in subclasses.
-   *
-   *  @param key the given key value
-   *  @throws Predef.NoSuchElementException
-   */
-  def default(key: A): B =
-    throw new NoSuchElementException("key not found: " + key)
-
-  override def projection: Map.Projection[A,B] = new Map.Projection[A, B] {
-    override def elements = Map.this.elements
-    override def size = Map.this.size
-    override def get(key: A): Option[B] = Map.this.get(key)
-  }
-  /** non-strict filter based on keys only */
-  def filterKeys(p: A => Boolean): Map.Projection[A, B] = new Map.Projection[A, B] {
-    def elements = Map.this.elements.filter(x => p(x._1))
-    def size = {
-      var sz = 0
-      Map.this.foreach(x => if (p(x._1)) sz = sz + 1)
-      sz
-    }
-    override def contains(key: A) = Map.this.contains(key) && p(key)
-    override def get(key: A) = if (!p(key)) None else Map.this.get(key)
-  }
-  /** non-strict map elements using existing key set */
-  def mapElements[C](f: B => C) : Map.Projection[A,C] = new Map.Projection[A,C] {
-    def elements = Map.this.elements.map(e => (e._1, f(e._2)))
-    def size = Map.this.size
-    override def contains(key: A) = Map.this.contains(key)
-    override def get(key: A) = Map.this.get(key).map(f)
-  }
+  def mapBuilder[A, B]: Builder[(A, B), Map[A, B], Any] = Map.newBuilder[A, B]
+}
 
-  /** Defines the prefix of this object's <code>toString</code> representation.
-   */
-  override protected def stringPrefix: String = "Map"
+/* Factory object for `Map` class */
+object Map extends ImmutableMapFactory[immutable.Map] {
+  type Coll = Map[_, _]
+  def empty[A, B]: immutable.Map[A, B] = immutable.Map.empty
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), Map[A, B], Coll] = new BuilderFactory[(A, B), Map[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
 }
diff --git a/src/library/scala/collection/MapProxy.scala b/src/library/scala/collection/MapProxy.scala
index 5084989bbd..1c3dd14e36 100644
--- a/src/library/scala/collection/MapProxy.scala
+++ b/src/library/scala/collection/MapProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -43,3 +44,4 @@ trait MapProxy[A, +B] extends Map[A, B] with CollectionProxy[(A, B)] {
   override def filterKeys(p: A => Boolean) = self filterKeys p
   override def mapElements[C](f: B => C) = self mapElements f
 }
+*/
diff --git a/src/library/scala/collection/RollbackIterator.scala b/src/library/scala/collection/RollbackIterator.scala.disabled
index fb994dd168..09ef4b6c3e 100644
--- a/src/library/scala/collection/RollbackIterator.scala
+++ b/src/library/scala/collection/RollbackIterator.scala.disabled
@@ -34,8 +34,8 @@ class RollbackIterator[+A](underlying: Iterator[A]) extends BufferedIterator.Def
     }
     else Some(rollback.length)
 
-  /** will rollback all elements iterated during
-   *  <code>f</code>'s execution if <code>f</code> return false
+  /** will rollback all elements iterated during 
+   *  <code>f</code>'s execution if <code>f</code> return false 
    */
   def tryRead[T](f: => Option[T]): Option[T] = {
     val oldLength = initRollback
@@ -48,11 +48,11 @@ class RollbackIterator[+A](underlying: Iterator[A]) extends BufferedIterator.Def
         val sz = oldLength.getOrElse(0)
         val i = rollback.drop(sz).reverse.elements
         while (i.hasNext) putBack(i.next)
-        if (oldLength.isEmpty) rollback = null
+        if (oldLength.isEmpty) rollback = null          
         else rollback.reduceToSize(sz)
       }
     }
-    if (!g.isEmpty && oldLength.isEmpty)
+    if (!g.isEmpty && oldLength.isEmpty) 
       rollback = null
     g
 
@@ -72,7 +72,7 @@ class RollbackIterator[+A](underlying: Iterator[A]) extends BufferedIterator.Def
     f(in)
   }
 
-  /** returns true if any elements are iterated over during <code>f</code>'s execution
+  /** returns true if any elements are iterated over during <code>f</code>'s execution 
    */
   def read(f: => Unit): Boolean = remember[Boolean] {
     f; seq => !seq.isEmpty
@@ -81,7 +81,7 @@ class RollbackIterator[+A](underlying: Iterator[A]) extends BufferedIterator.Def
   /** if elements of <code>seq</code> will be iterated over next in this iterator,
    *  returns true and iterates over these elements
    */
-  override def readIfStartsWith(seq : Seq[Any]) : Boolean =
+  override def readIfStartsWith(seq : Seq[Any]) : Boolean = 
     !tryRead{if (seq.forall(a => hasNext && next == a)) Some(()) else None}.isEmpty
 
 }
diff --git a/src/library/scala/collection/Sequence.scala b/src/library/scala/collection/Sequence.scala
new file mode 100755
index 0000000000..18f17d0513
--- /dev/null
+++ b/src/library/scala/collection/Sequence.scala
@@ -0,0 +1,55 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection
+
+import mutable.ListBuffer
+// import immutable.{List, Nil, ::}
+import generic._
+import util.control.Breaks._
+
+/** Class <code>Sequence[A]</code> represents sequences of elements
+ *  of type <code>A</code>.
+ *  It adds the following methods to class Iterable:
+ *   `length`, `lengthCompare`, `apply`, `isDefinedAt`, `segmentLength`, `prefixLengh`,
+ *   `indexWhere`, `indexOf`, `lastIndexWhere`, `lastIndexOf`, `reverse`, `reversedElements`,
+ *   `startsWith`, `endsWith`, `indexOfSeq`.
+ *
+ *
+ *  @author  Martin Odersky
+ *  @author  Matthias Zenger
+ *  @version 1.0, 16/07/2003
+ */
+trait Sequence[+A] extends PartialFunction[Int, A] with Iterable[A] with SequenceTemplate[A, Sequence[A]] {
+  override protected[this] def newBuilder = Sequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Sequence[B], Any] = Sequence.newBuilder[B]
+}
+
+object Sequence extends SequenceFactory[Sequence] {
+
+  type Coll = Sequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Sequence[A], Coll] = new BuilderFactory[A, Sequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Sequence[A], Any] = immutable.Sequence.newBuilder[A]
+
+  /** @deprecated use View instead
+   */
+  @deprecated type Projection[A] = SequenceView[A, Coll]
+
+  /** @deprecated use Sequence(value) instead */
+  @deprecated def singleton[A](value: A) = Sequence(value)
+
+  /** Builds a singleton sequence.
+   *
+   * @deprecated use <code>Sequence(x)</code> instead.
+   */
+  @deprecated def single[A](x: A) = singleton(x)
+}
+
diff --git a/src/library/scala/collection/SequenceProxy.scala b/src/library/scala/collection/SequenceProxy.scala
new file mode 100644
index 0000000000..40ad16f312
--- /dev/null
+++ b/src/library/scala/collection/SequenceProxy.scala
@@ -0,0 +1,25 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
+
+
+package scala.collection
+
+import generic._
+
+// Methods could be printed by  cat Traversibe.scala | egrep '^  (override )?def'
+
+
+/** This trait implements a proxy for iterable objects. It forwards
+ *  all calls to a different iterable object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait SequenceProxy[+A] extends Sequence[A] with SequenceProxyTemplate[A, Sequence[A]]
diff --git a/src/library/scala/collection/Set.scala b/src/library/scala/collection/Set.scala
index 47cf7871e0..691953bdf1 100644
--- a/src/library/scala/collection/Set.scala
+++ b/src/library/scala/collection/Set.scala
@@ -8,115 +8,33 @@
 
 // $Id$
 
-
 package scala.collection
 
+import generic._
 
 /** <p>
  *    A set is a collection that includes at most one of any object.
  *  </p>
  *  <p>
- *    This trait provides a limited interface, only allowing reading of elements.
- *    There are two extensions of this trait, in packages
- *    <code><a href="mutable$content.html" target="contentFrame">
- *    scala.collection.mutable</a></code>
- *    and <code><a href="immutable$content.html" target="contentFrame">
- *    scala.collection.immutable</a></code>, which provide functionality for
- *    adding and removing objects from the set. The trait in the first package is
- *    for sets that are modified destructively, whereas the trait in
- *    the second package is for immutable sets which create a new set
- *    when something is added or removed to them.
  *
  *  @author  Matthias Zenger
  *  @author  Martin Odersky
- *  @version 2.0, 01/01/2007
+ *  @version 2.8
  */
-trait Set[A] extends (A => Boolean) with Collection[A] {
-
-  /** Returns the number of elements in this set.
-   *
-   *  @return number of set elements.
-   */
-  def size: Int
-
-  /** Checks if this set contains element <code>elem</code>.
-   *
-   *  @param elem the element to check for membership.
-   *  @return     <code>true</code> iff <code>elem</code> is contained in
-   *              this set.
-   */
-  def contains(elem: A): Boolean
-
-  /** This method allows sets to be interpreted as predicates.
-   *  It returns <code>true</code>, iff this set contains element
-   *  <code>elem</code>.
-   *
-   *  @param elem the element to check for membership.
-   *  @return     <code>true</code> iff <code>elem</code> is contained in
-   *              this set.
-   */
-  def apply(elem: A): Boolean = contains(elem)
-
-  /** Checks if this set is empty.
-   *
-   *  @return <code>true</code> iff there is no element in the set.
-   */
-  override def isEmpty: Boolean = size == 0
-
-  /** Checks if this set is a subset of set <code>that</code>.
-   *
-   *  @param that another set.
-   *  @return     <code>true</code> iff the other set is a superset of
-   *              this set.
-   *  todo: rename to isSubsetOf
-   */
-  def subsetOf(that: Set[A]): Boolean = forall(that.contains)
-
-  @deprecated def *(that : Set[A]) : Set[A] = this ** that
+trait Set[A] extends (A => Boolean) with Iterable[A] with SetTemplate[A, Set[A]] {
+  def empty = Set.empty
+  override def traversibleBuilder[B]: Builder[B, Set[B], Any] = Set.newBuilder[B]
+}
 
-  /** Intersect. It computes an intersection with set <code>that</code>.
-   *  It removes all the elements that are not present in <code>that</code>.
-   *
-   *  @param that the set to intersect with
-   */
-  def **(that : Set[A]) : Set[A] = {
-     val min = Math.min(size, that.size)
-     val buf = new Array[A](min)
-     var count = 0
-     val i = elements
-     while (i.hasNext) {
-       val a = i.next
-       if (that.contains(a)) {
-         buf(count) = a
-         count += 1
-       }
-     }
-     if (count == size) this
-     else if (count == that.size) that
-     else {
-       import scala.collection.mutable.HashSet
-       val ret = new HashSet[A]
-       ret ++= buf.projection.take(count)
-       ret
-     }
-  }
-  /** Compares this set with another object and returns true, iff the
-   *  other object is also a set which contains the same elements as
-   *  this set.
-   *
-   *  @param that the other object
-   *  @note not necessarily run-time type safe.
-   *  @return     <code>true</code> iff this set and the other set
-   *              contain the same elements.
-   */
-  override def equals(that: Any): Boolean = that match {
-    case other: Set[_] =>
-      this.size == other.size && subsetOf(other.asInstanceOf[Set[A]])
-    case _ =>
-      false
-  }
+/* Factory object for `Set` class */
+object Set extends SetFactory[Set] {
+  def empty[A]: Set[A] = immutable.Set.empty[A]
+  type Coll = Set[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Set[A], Coll] = new BuilderFactory[A, Set[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+}
 
-  override def hashCode() =
+/* !!! what to do about this?
+override def hashCode() =
     (0 /: this)((hash, e) => hash + e.hashCode())
 
   override def toArray[B >: A]: Array[B] = {
@@ -128,4 +46,4 @@ trait Set[A] extends (A => Boolean) with Collection[A] {
   /** Defines the prefix of this object's <code>toString</code> representation.
    */
   override protected def stringPrefix : String = "Set"
-}
+*/
diff --git a/src/library/scala/collection/SetProxy.scala b/src/library/scala/collection/SetProxy.scala
index e80c28a8d5..7ed2d7f957 100644
--- a/src/library/scala/collection/SetProxy.scala
+++ b/src/library/scala/collection/SetProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -28,3 +29,4 @@ trait SetProxy[A] extends Set[A] with IterableProxy[A] {
   def contains(elem: A): Boolean = self.contains(elem)
   override def subsetOf(that: Set[A]): Boolean = self.subsetOf(that)
 }
+*/
diff --git a/src/library/scala/collection/SortedMap.scala b/src/library/scala/collection/SortedMap.scala
index e2bbdeab8f..55eab25648 100644
--- a/src/library/scala/collection/SortedMap.scala
+++ b/src/library/scala/collection/SortedMap.scala
@@ -7,38 +7,20 @@
 \*                                                                      */
 
 // $Id$
+package scala.collection
 
-package scala.collection;
+import generic._
 
 /** A map whose keys are sorted.
  *
  *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-trait SortedMap[K,+E] extends Map[K,E] with Sorted[K,Tuple2[K,E]] {
-  override def firstKey : K = elements.next._1;
-  override def lastKey : K = {
-    val i = elements;
-    var last : K = i.next._1;
-    while (i.hasNext) last = i.next._1;
-    last;
-  }
+trait SortedMap[A, +B] extends Map[A, B] with SortedMapTemplate[A, B, SortedMap[A, B]] {
+  /** Needs to be overridden in subclasses. */
+  override def empty: SortedMap[A, B] = throw new UnsupportedOperationException("SortedMap.empty")
+  override protected[this] def newBuilder : Builder[(A, B), SortedMap[A, B], Any] =
+    throw new UnsupportedOperationException("SortedMap.newBuilder")
 
-  // XXX: implement default version
-  override def rangeImpl(from : Option[K], until : Option[K]) : SortedMap[K,E];
-  override def from(from: K) = rangeImpl(Some(from), None);
-  override def until(until: K) = rangeImpl(None, Some(until));
-  override def range(from: K, until: K) = rangeImpl(Some(from),Some(until));
-
-  protected class DefaultKeySet extends SortedSet[K] {
-    def size = SortedMap.this.size
-    def contains(key : K) = SortedMap.this.contains(key)
-    def elements = SortedMap.this.elements.map(_._1)
-    def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0, k1);
-    override def rangeImpl(from : Option[K], until : Option[K]) : SortedSet[K] = {
-      val map = SortedMap.this.rangeImpl(from,until);
-      new map.DefaultKeySet;
-    }
-  }
-  // XXX: implement default version
-  override def keySet : SortedSet[K] = new DefaultKeySet;
 }
diff --git a/src/library/scala/collection/SortedSet.scala b/src/library/scala/collection/SortedSet.scala
index 8046a8b002..635e1f9026 100644
--- a/src/library/scala/collection/SortedSet.scala
+++ b/src/library/scala/collection/SortedSet.scala
@@ -7,42 +7,19 @@
 \*                                                                      */
 
 // $Id$
+// !!! todo: integrate in new collections library
 
 package scala.collection
 
-/** Analogous to a Java sorted set.
+import generic._
+
+/** A sorted set.
  *
  *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-trait SortedSet[A] extends Set[A] with Sorted[A, A] {
-
-  override def keySet = this
-
-  override def firstKey: A = {
-    val i = elements
-    if (i.hasNext) i.next
-    else throw new NoSuchElementException
-  }
-
-  override def lastKey: A = {
-    var last: A = null.asInstanceOf[A]
-    val i = elements
-    while (i.hasNext) last = i.next;
-    if (last == null) throw new NoSuchElementException
-    else last
-  }
-
-  override def rangeImpl(from: Option[A], until: Option[A]): SortedSet[A]
-
-  override def from(from: A) = rangeImpl(Some(from), None)
-
-  override def until(until: A) = rangeImpl(None, Some(until))
-
-  override def range(from: A, until: A) = rangeImpl(Some(from),Some(until))
-
-  override def subsetOf(that: Set[A]): Boolean = that match {
-    case that: SortedSet[_] => that.hasAll(elements)
-    case that => super.subsetOf(that)
-  }
-
+trait SortedSet[A] extends Set[A] with SortedSetTemplate[A, SortedSet[A]] {
+  /** Needs to be overridden in subclasses. */
+  override def empty: SortedSet[A] = throw new UnsupportedOperationException("SortedMap.empty")
 }
diff --git a/src/library/scala/collection/Traversible.scala b/src/library/scala/collection/Traversible.scala
new file mode 100755
index 0000000000..886fd1c767
--- /dev/null
+++ b/src/library/scala/collection/Traversible.scala
@@ -0,0 +1,213 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Traversible.scala 15188 2008-05-24 15:01:02Z stepancheg $
+package scala.collection
+
+// import immutable.{List, Stream, Nil}
+import mutable.{Buffer, ArrayBuffer, ListBuffer}
+import util.control.Breaks._
+import generic._
+
+/** A template trait for traversible collections.
+ *
+ *  Collection classes mixing in this trait provide a method
+ *  <code>foreach</code> which traverses all the
+ *  elements contained in the collection, applying a given procedure to each.
+ *  They also provide a method `newBuilder`
+ *  which creates a builder for collections of the same kind.
+ *
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait Traversible[+A] extends TraversibleTemplate[A, Traversible[A]] {
+  protected[this] def newBuilder = Traversible.newBuilder
+  def traversibleBuilder[B]: Builder[B, Traversible[B], Any] = Traversible.newBuilder[B]
+
+  /* The following methods are inherited from TraversibleTemplate
+   *
+  override def isEmpty: Boolean
+  override def size: Int
+  override def hasDefiniteSize
+  override def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, Traversible[A]]): That
+  override def ++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, Traversible[A]]): That
+  override def map[B, That](f: A => B)(implicit bf: BuilderFactory[B, That, Traversible[A]]): That
+  override def flatMap[B, That](f: A => Traversible[B])(implicit bf: BuilderFactory[B, That, Traversible[A]]): That
+  override def filter(p: A => Boolean): Traversible[A]
+  override def remove(p: A => Boolean): Traversible[A]
+  override def partition(p: A => Boolean): (Traversible[A], Traversible[A])
+  override def groupBy[K](f: A => K): Map[K, Traversible[A]]
+  override def foreach(f: A => Unit): Unit
+  override def forall(p: A => Boolean): Boolean
+  override def exists(p: A => Boolean): Boolean
+  override def count(p: A => Boolean): Int
+  override def find(p: A => Boolean): Option[A]
+  override def foldLeft[B](z: B)(op: (B, A) => B): B
+  override def /: [B](z: B)(op: (B, A) => B): B
+  override def foldRight[B](z: B)(op: (A, B) => B): B
+  override def :\ [B](z: B)(op: (A, B) => B): B
+  override def reduceLeft[B >: A](op: (B, A) => B): B
+  override def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B]
+  override def reduceRight[B >: A](op: (A, B) => B): B
+  override def reduceRightOpt[B >: A](op: (A, B) => B): Option[B]
+  override def head: A
+  override def headOption: Option[A]
+  override def tail: Traversible[A]
+  override def last: A
+  override def lastOption: Option[A]
+  override def init: Traversible[A]
+  override def take(n: Int): Traversible[A]
+  override def drop(n: Int): Traversible[A]
+  override def slice(from: Int, until: Int): Traversible[A]
+  override def takeWhile(p: A => Boolean): Traversible[A]
+  override def dropWhile(p: A => Boolean): Traversible[A]
+  override def span(p: A => Boolean): (Traversible[A], Traversible[A])
+  override def splitAt(n: Int): (Traversible[A], Traversible[A])
+  override def copyToBuffer[B >: A](dest: Buffer[B])
+  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int)
+  override def copyToArray[B >: A](xs: Array[B], start: Int)
+  override def toArray[B >: A]: Array[B]
+  override def toList: List[A]
+  override def toIterable: Iterable[A]
+  override def toSequence: Sequence[A]
+  override def toStream: Stream[A]
+//  override def sortWith(lt : (A,A) => Boolean): Traversible[A]
+  override def mkString(start: String, sep: String, end: String): String
+  override def mkString(sep: String): String
+  override def mkString: String
+  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
+  override def addString(b: StringBuilder, sep: String): StringBuilder
+  override def addString(b: StringBuilder): StringBuilder
+  override def toString
+  override def stringPrefix : String
+  override def view
+  override def view(from: Int, until: Int): TraversibleView[A, Traversible[A]]
+  */
+}
+
+/** Factory methods and utilities for instances of type Traversible */
+object Traversible extends TraversibleFactory[Traversible] { self =>
+
+  type Coll = Traversible[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Traversible[A], Coll] = new BuilderFactory[A, Traversible[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Traversible[A], Any] = immutable.Traversible.newBuilder[A]
+
+  /** A wrapper class which adds `min` and `max` methods to iterables of an element type that has an Ordering.
+   */
+  class ComparableTraversibleOps[A](self: Traversible[A], cmp: Ordering[A]) {
+
+    /** Returns the minimal element of the wrapped iterable `self` with respect to the given ordering `cmp` */
+    def min: A = {
+      require(!self.isEmpty, "min(<empty>)")
+      var acc = self.head
+      for (x <- self)
+        if (cmp.lt(x, acc)) acc = x
+      acc
+    }
+
+    /** Returns the maximal element of the wrapped iterable `self` with respect to the given ordering `cmp` */
+    def max: A = {
+      require(!self.isEmpty, "max(<empty>)")
+      var acc = self.head
+      for (x <- self)
+        if (cmp.gt(x, acc)) acc = x
+      acc
+    }
+  }
+
+  /** A wrapper class which adds `sum` and `product` methods to iterables of an element type that is `Numeric`.
+   */
+  class NumericTraversibleOps[A](self: Traversible[A], num: Numeric[A]) {
+
+    /** Returns the sum of all elements of the wrapped iterable `self` with respect to the numeric operations in `num` */
+    def sum: A = {
+      var acc = num.zero
+      for (x <- self) acc = num.plus(acc, x)
+      acc
+    }
+
+    /** Returns the product of all elements of the wrapped iterable `self` with respect to the numeric operations in `num` */
+    def product: A = {
+      var acc = num.one
+      for (x <- self) acc = num.times(acc, x)
+      acc
+    }
+  }
+
+  /** A wrapper class which adds `flatten` and `transpose` methods to iterables or iterable element type`.
+   */
+  class TraversibleTraversibleOps[This <: Traversible[Traversible[A]], A](self: This) {
+
+    /** Returns the concatenation of all elements of the wrapped iterable `self` */
+    def flatten[That](implicit bf: BuilderFactory[A, That, This]): That = {
+      val b = bf(self)
+      for (xs <- self)
+        b ++= xs
+      b.result
+    }
+
+    /** Returns the transposition of the wrapped iterable `self`: rows become columns and columns become rows.
+     */
+    def transpose[Row, That](implicit bf: BuilderFactory[A, Row, This], bbf: BuilderFactory[Row, That, This]): That = {
+      val bs: Array[Builder[A, Row, This]] = self.head.map(_ => bf(self))(Traversible.builderFactory[Builder[A, Row, This]]).toArray
+      for (xs <- self) {
+        var i = 0
+        for (x <- xs) {
+          bs(i) += x
+          i += 1
+        }
+      }
+      val bb = bbf(self)
+      for (b <- bs) bb += b.result
+      bb.result
+    }
+  }
+
+  /** A wrapper class which adds an `unzip` method to iterable whose elements are pairs.
+  	*/
+  class PairTraversibleOps[This <: Traversible[(A1, A2)], A1, A2](self: This) {
+
+    /** Returns a pair of iterables consisting of the first, respectively second, component of all
+     *  elements in the wrapped iterable `self`.
+     */
+    def unzip[That1, That2](implicit bf1: BuilderFactory[A1, That1, This], bf2: BuilderFactory[A2, That2, This]): (That1, That2) = {
+      val b1 = bf1(self)
+      val b2 = bf2(self)
+      for ((x1, x2) <- self) {
+        b1 += x1
+        b2 += x2
+      }
+      (b1.result, b2.result)
+    }
+  }
+
+  /** Implicit wrapper conversion of iterables with elements admitting comparison.
+   *  @see ComparableTraversibleOps
+   */
+  implicit def comparableTraversibleWrapper[A](self: Traversible[A])(implicit cmp: Ordering[A]) =
+    new ComparableTraversibleOps(self, cmp)
+
+  /** Implicit wrapper conversion of iterables with numeric elements.
+   *  @see NumericTraversibleOps
+   */
+  implicit def numericTraversibleWrapper[A](self: Traversible[A])(implicit num: Numeric[A]) =
+    new NumericTraversibleOps(self, num)
+
+  /** Implicit wrapper conversion of iterables with iterable elements.
+   *  @see TraversibleTraversibleOps
+   */
+  implicit def traversibleTraversibleWrapper[This <: Traversible[Traversible[A]], A](self: This) =
+    new TraversibleTraversibleOps[This, A](self) // !!! error if type parameters are omitted
+
+  /** Implicit wrapper conversion of iterables with pairs as elements.
+   *  @see PairTraversibleOps
+   */
+  implicit def pairTraversibleWrapper[This <: Traversible[(A1, A2)], A1, A2](self: This) =
+    new PairTraversibleOps[This, A1, A2](self)
+}
+
diff --git a/src/library/scala/collection/TraversibleProxy.scala b/src/library/scala/collection/TraversibleProxy.scala
new file mode 100644
index 0000000000..edff865af2
--- /dev/null
+++ b/src/library/scala/collection/TraversibleProxy.scala
@@ -0,0 +1,25 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
+
+
+package scala.collection
+
+import generic._
+
+// Methods could be printed by  cat TraversibeTemplate.scala | egrep '^  (override )?def'
+
+
+/** This trait implements a proxy for traversible objects. It forwards
+ *  all calls to a different traversible object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait TraversibleProxy[+A] extends Traversible[A] with TraversibleProxyTemplate[A, Traversible[A]]
diff --git a/src/library/scala/collection/Vector.scala b/src/library/scala/collection/Vector.scala
new file mode 100755
index 0000000000..fea38a774e
--- /dev/null
+++ b/src/library/scala/collection/Vector.scala
@@ -0,0 +1,33 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
+
+package scala.collection
+
+import generic._
+import mutable.ArrayBuffer
+
+/** Sequences that support O(1) element access and O(1) length computation.
+ *  This class does not add any methods to Sequence but overrides several
+ *  methods with optimized implementations.
+ *
+ *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait Vector[+A] extends Sequence[A] with VectorTemplate[A, Vector[A]] {
+  override protected[this] def newBuilder = Vector.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Vector[B], Any] = Vector.newBuilder[B]
+}
+
+object Vector extends SequenceFactory[Vector] {
+  type Coll = Vector[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Vector[A], Coll] = new BuilderFactory[A, Vector[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Vector[A], Any] = mutable.Vector.newBuilder[A]
+}
diff --git a/src/library/scalax/collection/generic/Addable.scala b/src/library/scala/collection/generic/Addable.scala
index 40a4f60e6e..ea45be91f3 100755
--- a/src/library/scalax/collection/generic/Addable.scala
+++ b/src/library/scala/collection/generic/Addable.scala
@@ -8,17 +8,17 @@
 
 // $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
 
-package scalax.collection.generic
+package scala.collection.generic
 
-/** This class represents collections that can be augmented using a += operator.
+/** This class represents collections that can be augmented usmutableing a += operator.
  *
  *  @autor   Martin Odersky
  *  @owner   Martin Odersky
  *  @version 2.8
  */
-trait Addable[+C <: Addable[C, A], A] {
+trait Addable[A, +This <: Addable[A, This]] { self =>
 
-  protected def thisCC: C
+  protected def thisCollection: This
 
   /** Adds a single element to this collection and returns
    *  either the collection itself (if it is mutable), or a new collection
@@ -26,7 +26,7 @@ trait Addable[+C <: Addable[C, A], A] {
    *
    *  @param elem  the element to add.
    */
-  def +(elem: A): C
+  def + (elem: A): This
 
   /** Adds two or more elements to this collection and returns
    *  either the collection itself (if it is mutable), or a new collection
@@ -36,8 +36,8 @@ trait Addable[+C <: Addable[C, A], A] {
    *  @param elem2 the second element to add.
    *  @param elems the remaining elements to add.
    */
-  def +(elem1: A, elem2: A, elems: A*): C =
-    thisCC + elem1 + elem2 ++ elems.asInstanceOf[Iterable[A]] // !@!
+  def + (elem1: A, elem2: A, elems: A*): This =
+    this + elem1 + elem2 ++ Iterable.fromOld(elems)
 
   /** Adds a number of elements provided by an iterable object
    *  via its <code>elements</code> method and returns
@@ -46,7 +46,7 @@ trait Addable[+C <: Addable[C, A], A] {
    *
    *  @param iter     the iterable object.
    */
-  def ++(iter: Iterable[A]): C = (thisCC /: iter) (_ + _)
+  def ++ (iter: Traversible[A]): This = (thisCollection /: iter) (_ + _)
 
   /** Adds a number of elements provided by an iterator
    *  via its <code>elements</code> method and returns
@@ -55,7 +55,7 @@ trait Addable[+C <: Addable[C, A], A] {
    *
    *  @param iter   the iterator
    */
-  def ++(iter: Iterator[A]): C = (thisCC /: iter) (_ + _)
+  def ++ (iter: Iterator[A]): This = (thisCollection /: iter) (_ + _)
 
 }
 
diff --git a/src/library/scala/collection/generic/AddingBuilder.scala b/src/library/scala/collection/generic/AddingBuilder.scala
new file mode 100755
index 0000000000..3b44e70a6a
--- /dev/null
+++ b/src/library/scala/collection/generic/AddingBuilder.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scala.collection.generic
+
+// import collection.immutable.{List, Nil, ::}
+
+/** The canonical builder for collections that are addable, i.e. that support an efficient + method
+ *  which adds an element to the collection.
+ *  Collections are built from their empty element using this + method.
+ *  @param empty   The empty element of the collection.
+ */
+class AddingBuilder[A, Coll <: Addable[A, Coll] with Iterable[A] with IterableTemplate[A, Coll]](empty: Coll)
+extends Builder[A, Coll, Any] {
+  protected var elems: Coll = empty
+  def +=(x: A) { elems = elems + x }
+  def clear() { elems = empty }
+  def result: Coll = elems
+}
diff --git a/src/library/scala/collection/generic/BitSetTemplate.scala b/src/library/scala/collection/generic/BitSetTemplate.scala
new file mode 100755
index 0000000000..406ba1d431
--- /dev/null
+++ b/src/library/scala/collection/generic/BitSetTemplate.scala
@@ -0,0 +1,158 @@
+package scala.collection.generic
+
+import BitSetTemplate._
+import generic._
+
+/** common base class for mutable and immutable bit sets
+ */
+trait BitSetTemplate[+This <: BitSetTemplate[This] with Set[Int]] extends SetTemplate[Int, This] { self =>
+
+  /** The number of words (each with 64 bits) making up the set */
+  protected def nwords: Int
+
+  /** The words at index `idx', or 0L if outside the range of the set
+   *  @pre idx >= 0
+   */
+  protected def word(idx: Int): Long
+
+  /** Update word at index `idx`; enlarge set if `idx` outside range of set
+   */
+  protected def updateWord(idx: Int, w: Long): This
+
+  /** Create a new set of this kind from an array of longs
+   */
+  protected def fromArray(elems: Array[Long]): This
+
+  /** Adds element to bitset, reusing set if its mutable.
+   */
+  override def + (elem: Int): This = {
+    require(elem >= 0)
+    if (contains(elem)) thisCollection
+    else {
+      val idx = elem >> LogWL
+      updateWord(idx, word(idx) | (1L << elem))
+    }
+  }
+
+  /** Removes element to bitset, reusing set if its mutable.
+   */
+  override def - (elem: Int): This = {
+    require(elem >= 0)
+    if (contains(elem)) {
+      val idx = elem >> LogWL
+      updateWord(idx, word(idx) & ~(1L << elem))
+    } else thisCollection
+  }
+
+  /** The number of elements in the bitset.
+   */
+  override def size: Int = {
+    var s = 0
+    var i = nwords
+    while (i > 0) {
+      i -= 1
+      s += popCount(word(i))
+    }
+    s
+  }
+
+  def elements = new Iterator[Int] {
+    private var current = 0
+    private val end = nwords * WordLength
+    def hasNext: Boolean = {
+      while (current < end && !self.contains(current)) current += 1
+      current < end
+    }
+    def next(): Int =
+      if (hasNext) { val r = current; current += 1; r }
+      else Iterator.empty.next
+  }
+
+  override def foreach(f: Int => Unit) {
+    for (i <- 0 until nwords) {
+      val w = word(i)
+      for (j <- i * WordLength until (i + 1) * WordLength) {
+        if ((w & (1L << j)) != 0) f(j)
+      }
+    }
+  }
+
+  /** A new bitset which is the logical or of this set and the given argument set.
+   */
+  def | (other: BitSet): This = {
+    val len = this.nwords max other.nwords
+    val words = new Array[Long](len)
+    for (idx <- 0 until len)
+      words(idx) = this.word(idx) | other.word(idx)
+    fromArray(words)
+  }
+
+  /** A new bitset which is the logical and of this set and the given argument set.
+   */
+  def & (other: BitSet): This = {
+    val len = this.nwords min other.nwords
+    val words = new Array[Long](len)
+    for (idx <- 0 until len)
+      words(idx) = this.word(idx) & other.word(idx)
+    fromArray(words)
+  }
+
+  /** A new bitset which is the logical and-not of this set and the given argument set.
+   */
+  def &~ (other: BitSet): This = {
+    val len = this.nwords
+    val words = new Array[Long](len)
+    for (idx <- 0 until len)
+      words(idx) = this.word(idx) & ~other.word(idx)
+    fromArray(words)
+  }
+
+  /** A new bitset which is the logical exclusive or of this set and the given argument set.
+   */
+  def ^ (other: BitSet): This = {
+    val len = this.nwords max other.nwords
+    val words = new Array[Long](len)
+    for (idx <- 0 until len)
+      words(idx) = this.word(idx) ^ other.word(idx)
+    fromArray(words)
+  }
+
+  /** Does the set contain the given element?
+   */
+  def contains(elem: Int): Boolean =
+    0 <= elem && (word(elem >> LogWL) & (1L << elem)) != 0
+
+  /** Is the set a subset of the given bitset
+   */
+  def subSet(other: BitSet): Boolean =
+    (0 until nwords) forall (idx => (this.word(idx) & ~ other.word(idx)) == 0L)
+
+  /** Add bitset elements as numbers to string buffer
+   */
+  override def addString(sb: StringBuilder, start: String, sep: String, end: String) = {
+    sb append start
+    var pre = ""
+    for (i <- 0 until nwords * WordLength)
+      if (contains(i)) {
+        sb append pre append i
+        pre = sep
+      }
+    sb append end
+  }
+}
+
+object BitSetTemplate {
+  private val LogWL = 6
+  private val WordLength = 64
+
+  private val pc1: Array[Int] = {
+    def countBits(x: Int): Int = if (x == 0) 0 else x % 2 + countBits(x >>> 1)
+    Array.fromFunction(countBits _)(256)
+  }
+
+  private def popCount(w: Long): Int = {
+    def pc2(w: Int) = if (w == 0) 0 else pc1(w & 0xff) + pc1(w >>> 8)
+    def pc4(w: Int) = if (w == 0) 0 else pc2(w & 0xffff) + pc2(w >>> 16)
+    if (w == 0) 0 else pc4(w.toInt) + pc4((w >>> 32).toInt)
+  }
+}
diff --git a/src/library/scalax/collection/mutable/Buffer.scala b/src/library/scala/collection/generic/BufferTemplate.scala
index 3d0eaec84e..a946c2bdb3 100644..100755
--- a/src/library/scalax/collection/mutable/Buffer.scala
+++ b/src/library/scala/collection/generic/BufferTemplate.scala
@@ -9,14 +9,9 @@
 // $Id: Buffer.scala 15799 2008-08-15 18:23:54Z odersky $
 
 
-package scalax.collection.mutable
+package scala.collection.generic
 
-import generic._
-
-/* Factory object for `Buffer` trait */
-object Buffer extends SequenceFactory[Buffer] {
-  def apply[A](args: A*): Buffer[A] = ArrayBuffer.apply(args: _*)
-}
+import mutable.Buffer
 
 /** Buffers are used to create sequences of elements incrementally by
  *  appending, prepending, or inserting new elements. It is also
@@ -28,15 +23,17 @@ object Buffer extends SequenceFactory[Buffer] {
  *  @version 2.8
   */
 @cloneable
-trait Buffer[A] extends Sequence[A]
-                   with SequenceTemplate[Buffer, A]
-                   with Addable[Buffer[A], A]
-                   with Subtractable[Buffer[A], A]
-                   with Growable[A]
+trait BufferTemplate[A, +This <: BufferTemplate[A, This] with Buffer[A]]
+                extends Growable[A]
                    with Shrinkable[A]
 //      with Scriptable[Message[(Location, A)]]
-                   with Cloneable[Buffer[A]]
-{
+                   with Addable[A, This]
+                   with Subtractable[A, This]
+                   with Cloneable[This]
+                   with SequenceTemplate[A, This]
+{ self =>
+
+  import collection.{Iterable, Traversible}
 
 // Abstract methods from Vector:
 
@@ -52,25 +49,19 @@ trait Buffer[A] extends Sequence[A]
    *  @param newelem the new element.
    *  @throws   IndexOutofBoundsException if the index is not valid
    */
-  def update(n: Int, newelem: A): Unit
+  def update(n: Int, newelem: A)
 
   /** Return number of elements in the buffer
    */
   def length: Int
 
-  /** Create a new buffer of the same kind as this one */
-  def newBuilder[B]: Builder[Buffer, B] = new ArrayBuffer[B]
-
-  override def newBuilder[B](sizeHint: Int): Builder[Buffer, B] =
-    new ArrayBuffer[B](sizeHint)
-
 // Abstract methods from Appendable
 
   /** Append a single element to this buffer.
    *
    *  @param elem  the element to append.
    */
-  def +=(elem: A): Unit
+  def +=(elem: A)
 
   /** Clears the buffer contents.
    */
@@ -82,11 +73,11 @@ trait Buffer[A] extends Sequence[A]
    *  the identity of the buffer.
    *  @param elem  the element to prepend.
    */
-  def +:(elem: A): this.type
+  def +:(elem: A): This
 
   /** Append a single element to this buffer and return the identity of the buffer
    */
-  def +(elem: A): this.type = { +=(elem); this }
+  def +(elem: A): This = { +=(elem); thisCollection }
 
   /** Inserts new elements at the index <code>n</code>. Opposed to method
    *  <code>update</code>, this method will not replace an element with a
@@ -96,26 +87,23 @@ trait Buffer[A] extends Sequence[A]
    *  @param iter    the iterable object providing all elements to insert.
    *  @throws   IndexOutofBoundsException if the index is not valid
    */
-  def insertAll(n: Int, iter: Iterable[A]): Unit
+  def insertAll(n: Int, iter: Traversible[A])
 
-  /** Removes  a number of elements from a given index position.
+
+  /** Removes the element on a given index position.
    *
    *  @param n  the index which refers to the element to delete.
-   *  @param count  the number of elements to delete
-   *  @throws   IndexOutofBoundsException if the index is not valid
    */
-  def remove(n: Int, count: Int): Unit
-
-// Concrete methods
+  def remove(n: Int): A
 
-  /** Removes the element on a given index position.
+  /** Removes  a number of elements from a given index position.
    *
    *  @param n  the index which refers to the element to delete.
+   *  @param count  the number of elements to delete
+   *  @throws   IndexOutofBoundsException if the index is not valid
    */
-  def remove(n: Int): A = {
-    val elem = this(n)
-    remove(n, 1)
-    elem
+  def remove(n: Int, count: Int) {
+    for (i <- 0 until count) remove(n)
   }
 
   /** Removes a single element from this buffer, at its first occurrence.
@@ -133,14 +121,14 @@ trait Buffer[A] extends Sequence[A]
    *
    *  @param x  the element to remove.
    */
-  def -(elem: A): this.type = { -=(elem); this }
+  def - (elem: A): This = { -=(elem); thisCollection }
 
   /** Prepend two ore more elements to this buffer and return
    *  the identity of the buffer.
    *  @param elem  the element to prepend.
    */
-  def +:(elem1: A, elem2: A, elems: A*): this.type =
-    elem1 +: elem2 +: (elems.asInstanceOf[Iterable[A]]) ++: this // !@!
+  def +:(elem1: A, elem2: A, elems: A*): This =
+    (elem1 +: elem2 +: Iterable.fromOld(elems) ++: thisCollection).asInstanceOf[This] // !!! does not work yet because conrete overrides abstract
 
   /** Prepends a number of elements provided by an iterable object
    *  via its <code>elements</code> method. The identity of the
@@ -148,7 +136,7 @@ trait Buffer[A] extends Sequence[A]
    *
    *  @param iter  the iterable object.
    */
-  def ++:(iter: Iterable[A]): this.type = { for (x <- iter) x +: this; this }
+  def ++:(iter: Traversible[A]): This = { for (x <- iter) x +: this; thisCollection }
 
   /** Prepends a number of elements provided by an iterator
    *  The identity of the buffer is returned.
@@ -156,26 +144,26 @@ trait Buffer[A] extends Sequence[A]
    *  @param iter   the iterator
    *  @return       the updated buffer.
    */
-  def ++:(iter: Iterator[A]): this.type = { for (x <- iter) x +: this; this }
+  def ++:(iter: Iterator[A]): This = { for (x <- iter) x +: this; thisCollection }
 
   /** Appends a elements to this buffer.
    *
    *  @param elems  the elements to append.
    */
-  def append(elems: A*) { this ++= elems.asInstanceOf[Iterable[A]] } // !@!
+  def append(elems: A*) { this ++= Iterable.fromOld(elems) }
 
   /** Appends a number of elements provided by an iterable object
    *  via its <code>elements</code> method.
    *
    *  @param iter  the iterable object.
    */
-  def appendAll(iter: Iterable[A]) { this ++= iter }
+  def appendAll(iter: Traversible[A]) { this ++= iter }
 
   /** Prepend given elements to this list.
    *
    *  @param elem  the element to prepend.
    */
-  def prepend(elems: A*) { elems.asInstanceOf[Iterable[A]] ++: this } // !@!
+  def prepend(elems: A*) { Iterable.fromOld(elems) ++: this }
 
   /** Prepends a number of elements provided by an iterable object
    *  via its <code>elements</code> method. The identity of the
@@ -183,7 +171,7 @@ trait Buffer[A] extends Sequence[A]
    *
    *  @param iter  the iterable object.
    */
-  def prependAll(iter: Iterable[A]) { iter ++: this }
+  def prependAll(iter: Traversible[A]) { iter ++: this }
 
   /** Prepends a number of elements provided by an iterable object
    *  via its <code>elements</code> method. The identity of the
@@ -200,7 +188,7 @@ trait Buffer[A] extends Sequence[A]
    *  @param n      the index where a new element will be inserted.
    *  @param elems  the new elements to insert.
    */
-  def insert(n: Int, elems: A*) { insertAll(n, elems.asInstanceOf[Iterable[A]]) } // !@!
+  def insert(n: Int, elems: A*) { insertAll(n, Iterable.fromOld(elems)) }
 
   /** Removes the first <code>n</code> elements.
    *
@@ -266,9 +254,7 @@ trait Buffer[A] extends Sequence[A]
       i += 1
     }
   }
-
 }
 
 
 
-
diff --git a/src/library/scala/collection/generic/Builder.scala b/src/library/scala/collection/generic/Builder.scala
new file mode 100755
index 0000000000..675596da2b
--- /dev/null
+++ b/src/library/scala/collection/generic/Builder.scala
@@ -0,0 +1,52 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scala.collection.generic
+
+/** The base trait of all builders.
+ *  A builder lets one construct a collection incrementally, by adding elements
+ *  to the builder with += and then converting to the required collection type with
+ *  `result`.
+ */
+trait Builder[-Elem, +To, -From] extends Growable[Elem] {
+
+  /** Adds a single element to the builder.
+   *  @param elem The element to be added
+   */
+  def +=(elem: Elem)
+
+  /** Clear the contents of this builder
+   */
+  def clear()
+
+  /** Returns collection resulting from this builder. The buffer's contents are undefined afterwards.
+   */
+  def result(): To
+
+  /** Give a hint how many elements are expected to be added
+   *  when the next `result` is called.
+   */
+  def sizeHint(size: Int) {}
+
+  /** Create a new builder which is the same as the current builder except that
+   *  a given function is applied to the current builder's result.
+   *  @param  f   the function to apply to the builder's result
+   */
+  def mapResult[NewTo](f: To => NewTo): Builder[Elem, NewTo, From] =
+    new Builder[Elem, NewTo, From] with Proxy {
+      val self = Builder.this
+      def +=(x: Elem) = self += x
+      def clear() = self.clear()
+      override def ++=(xs: Iterator[Elem]) = self ++= xs
+      override def ++=(xs: Traversible[Elem]) = self ++= xs
+      def result: NewTo = f(self.result)
+    }
+}
+
diff --git a/src/library/scalax/collection/Set.scala b/src/library/scala/collection/generic/BuilderFactory.scala
index a7234d0261..40bee09e43 100644
--- a/src/library/scalax/collection/Set.scala
+++ b/src/library/scala/collection/generic/BuilderFactory.scala
@@ -6,19 +6,14 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
 
-package scalax.collection
+package scala.collection.generic
 
-import generic._
-
-trait Set[A] extends SetTemplate[Set, A]
-
-/* Factory object for `Set` class */
-object Set extends IterableFactory[Set] {
-  /** The empty set */
-  def apply[A](args: A*): Set[A] = null // !!!
+/** A base class for builder factories
+ */
+trait BuilderFactory[-Elem, +To, -From] {
 
+  /** Creates a new builder */
+  def apply(from: From): Builder[Elem, To, From]
 }
-
-
diff --git a/src/library/scalax/collection/generic/Cloneable.scala b/src/library/scala/collection/generic/Cloneable.scala
index acf9a16686..bc26da9069 100644..100755
--- a/src/library/scalax/collection/generic/Cloneable.scala
+++ b/src/library/scala/collection/generic/Cloneable.scala
@@ -9,11 +9,11 @@
 // $Id: CloneableCollection.scala 16893 2009-01-13 13:09:22Z cunei $
 
 
-package scalax.collection.generic
+package scala.collection.generic
 
 /** A trait for cloneable collections.
  */
 @cloneable
-trait Cloneable[A <: AnyRef]  {
+trait Cloneable[+A <: AnyRef]  {
   override def clone(): A = super.clone().asInstanceOf[A]
 }
diff --git a/src/library/scala/collection/generic/DoubleLinkedListTemplate.scala b/src/library/scala/collection/generic/DoubleLinkedListTemplate.scala
new file mode 100755
index 0000000000..c86717f517
--- /dev/null
+++ b/src/library/scala/collection/generic/DoubleLinkedListTemplate.scala
@@ -0,0 +1,47 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: DoubleLinkedList.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+package scala.collection.generic
+
+/** This extensible class may be used as a basis for implementing double
+ *  linked lists. Type variable <code>A</code> refers to the element type
+ *  of the list, type variable <code>This</code> is used to model self
+ *  types of linked lists.
+ *
+ *  @author  Matthias Zenger
+ *  @version 1.0, 08/07/2003
+ */
+trait DoubleLinkedListTemplate[A, This >: Null <: LinearSequence[A] with DoubleLinkedListTemplate[A, This]] extends LinkedListTemplate[A, This] { self =>
+
+  var prev: This = _
+
+  override def append(that: This): Unit =
+    if (next eq null) {
+      next = that
+      if (that ne null) that.prev = thisCollection
+    } else
+      next.append(that)
+
+  override def insert(that: This): Unit = if (that ne null) {
+    that.append(next)
+    next = that
+    that.prev = thisCollection
+  }
+
+  def remove() {
+    if (next ne null)
+      next.prev = prev
+    if (prev ne null)
+      prev.next = next
+    prev = null
+    next = null
+  }
+}
diff --git a/src/library/scala/collection/generic/GenericSequenceFactory.scala.disabled b/src/library/scala/collection/generic/GenericSequenceFactory.scala.disabled
new file mode 100755
index 0000000000..70451741f8
--- /dev/null
+++ b/src/library/scala/collection/generic/GenericSequenceFactory.scala.disabled
@@ -0,0 +1,15 @@
+package scala.collection.generic
+
+/** A template for companion objects of Sequence and subclasses thereof.
+ */
+abstract class GenericSequenceFactory extends GenericTraversibleFactory {
+  
+  type Coll <: Sequence[_]
+  
+  /** This method is called in a pattern match { case Sequence(...) => }.
+   *
+   *  @param x the selector value
+   *  @return  sequence wrapped in an option, if this is a Sequence, otherwise none
+   */
+  def unapplySeq[A](x: Coll with Sequence[A]): Some[Coll with Sequence[A]] = Some(x)
+}
diff --git a/src/library/scala/collection/generic/GenericTraversibleFactory.scala.disabled b/src/library/scala/collection/generic/GenericTraversibleFactory.scala.disabled
new file mode 100755
index 0000000000..dece49de37
--- /dev/null
+++ b/src/library/scala/collection/generic/GenericTraversibleFactory.scala.disabled
@@ -0,0 +1,186 @@
+package scala.collection.generic
+
+/** A template for companion objects of Traversible and subclasses thereof.
+ */
+abstract class GenericTraversibleFactory {
+  
+  type Coll <: Traversible[_]
+
+ /** The empty iterable of type CC */
+  def empty[A, That](implicit bf: Coll => Builder[A, That, Coll]): That = apply[A, That]()
+ 
+  /** Creates an iterable of type CC with specified elements */
+  def apply[A, That](args: A*)(implicit bf: Coll => Builder[A, That, Coll]): That = {
+    val b = bf(thisCollection)
+    b ++= Iterable.fromOld(args)
+    b.result
+  }	
+  
+  /** Concatenate all the argument lists into a single list.
+   *
+   *  @param xss the lists that are to be concatenated
+   *  @return the concatenation of all the lists
+   */
+  def concat[A, That](xss: Traversible[A]*)(implicit bf: Coll => Builder[A, That, Coll]): That = {
+    val b = bf(thisCollection)
+    for (xs <- Iterable.fromOld(xss))
+      b ++= xs
+    b.result
+  }
+
+  /** An iterable that contains the results of some element computation a number of times.
+   *  @param   n  the number of elements returned
+   *  @param   elem the element computation
+   */
+  def fill[A, That](n: Int)(elem: => A)(implicit bf: Coll => Builder[A, That, Coll]): That = {
+    val b = bf(thisCollection)
+    var i = 0
+    while (i < n) {
+      b += elem
+      i += 1
+    }
+    b.result
+  }
+
+  /** A two-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   elem the element computation
+   */
+  def fill[A, C1, That](n1: Int, n2: Int)(elem: => A)(implicit b1: Builder[A, C1, Coll], b2: Builder[C1, That, Coll]): That =
+    tabulate(n1)(_ => fill(n2)(elem))
+/*
+  /** A three-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): CC[CC[CC[A]]] = 
+    tabulate(n1)(_ => fill(n2, n3)(elem))
+
+  /** A four-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): CC[CC[CC[CC[A]]]] = 
+    tabulate(n1)(_ => fill(n2, n3, n4)(elem))
+
+  /** A five-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   n5  the number of elements in the 5th dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): CC[CC[CC[CC[CC[A]]]]] = 
+    tabulate(n1)(_ => fill(n2, n3, n4, n5)(elem))
+*/	
+  
+  /** An iterable containing values of a given function over a range of integer values starting from 0.
+   *  @param  n   The number of elements in the iterable
+   *  @param  f   The function computing element values
+   *  @return An iterable consisting of elements `f(0), ..., f(n -1)`
+   */	
+  def tabulate[A, That](n: Int)(f: Int => A)(implicit bf: Coll => Builder[A, That, Coll]) = {
+    val b = bf(thisCollection)
+    var i = 0
+    while (i < n) {
+      b += f(i)
+      i += 1
+    }
+    b.result
+  }
+
+  /** A two-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   f   The function computing element values
+   */
+  def tabulate[A, C1, That](n1: Int, n2: Int)(f: (Int, Int) => A)(implicit b1: Builder[A, C1, Coll], b2: Builder[C1, That, Coll]): That = 
+    tabulate(n1)(i1 => tabulate(n2)(f(i1, _)))
+
+  /*
+  /** A three-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   f   The function computing element values
+   */	
+  def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): CC[CC[CC[A]]] = 
+    tabulate(n1)(i1 => tabulate(n2, n3)(f(i1, _, _)))
+
+  /** A four-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   f   The function computing element values
+   */	
+  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): CC[CC[CC[CC[A]]]] = 
+    tabulate(n1)(i1 => tabulate(n2, n3, n4)(f(i1, _, _, _)))
+
+  /** A five-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   n5  the number of elements in the 5th dimension
+   *  @param   f   The function computing element values
+   */	
+  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): CC[CC[CC[CC[CC[A]]]]] = 
+    tabulate(n1)(i1 => tabulate(n2, n3, n4, n5)(f(i1, _, _, _, _)))
+*/	
+  
+  /** An iterable containing a sequence of increasing integers in a range.
+   *
+   *  @param from the start value of the iterable
+   *  @param end the end value of the iterable (the first value NOT returned)
+   *  @return  the iterable with values in range `start, start + 1, ..., end - 1`
+   *  up to, but exclusding, `end`.
+   */
+  def range[That](start: Int, end: Int)(implicit bf: Coll => Builder[Int, That, Coll]): That =
+    range(start, end, 1)
+
+  /** An iterable containing equally spaced values in some integer interval.
+ 
+   *  @param start the start value of the iterable
+   *  @param end   the end value of the iterable (the first value NOT returned)
+   *  @param step  the increment value of the iterable (must be positive or negative)
+   *  @return      the iterable with values in `start, start + step, ...` up to, but excluding `end`
+   */
+  def range[That](start: Int, end: Int, step: Int)(implicit bf: Coll => Builder[Int, That, Coll]): That = {
+    val b = bf(thisCollection)
+    if (step == 0) throw new IllegalArgumentException("zero step")
+    var i = start
+    while (if (step < 0) end < i else i < end) {
+      b += i
+      i += step
+    }
+    b.result
+  }
+
+  /** An iterable containing repeated applications of a function to a start value.
+   *
+   *  @param start the start value of the iterable
+   *  @param len   the number of elements returned by the iterable
+   *  @param f     the function that's repeatedly applied
+   *  @return      the iterable returning `len` values in the sequence `start, f(start), f(f(start)), ...`
+   */
+  def iterate[That](start: Int, len: Int)(f: Int => Int)(implicit bf: Coll => Builder[Int, That, Coll]): That = {
+    val b = bf(thisCollection)
+    var acc = start
+    var i = 0
+    while (i < len) {
+      b += acc
+      acc = f(acc)
+      i += 1
+    }
+    b.result
+  }
+}
+
diff --git a/src/library/scalax/collection/generic/Growable.scala b/src/library/scala/collection/generic/Growable.scala
index 960384f9d0..7c4c52413b 100755
--- a/src/library/scalax/collection/generic/Growable.scala
+++ b/src/library/scala/collection/generic/Growable.scala
@@ -8,15 +8,16 @@
 
 // $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
 
-package scalax.collection.generic
+package scala.collection.generic
 
-/** This class represents collections that can be augmented using a += operator.
+/** This class represents collections that can be augmented using a `+=` operator
+ *  and that can be cleared of all elements using the `clear` method.
  *
  *  @autor   Martin Odersky
  *  @owner   Martin Odersky
  *  @version 2.8
  */
-trait Growable[A] {
+trait Growable[-A] {
 
   /** Adds a single element to this collection.
    *
@@ -33,20 +34,20 @@ trait Growable[A] {
   def +=(elem1: A, elem2: A, elems: A*) {
     this += elem1
     this += elem2
-    this ++= elems.asInstanceOf[Iterable[A]] // !@!
+    this ++= Iterable.fromOld(elems)
   }
 
   /** Adds a number of elements provided by an iterator to this collection.
    *
    *  @param iter  the iterator.
    */
-  def ++=(iter: collection.Iterator[A]) { iter foreach += }
+  def ++=(iter: Iterator[A]) { iter foreach += }
 
   /** Adds a number of elements provided by an iterable object to this collection.
    *
    *  @param iter  the iterable object.
    */
-  def ++=(iter: collection.Iterable[A]) { iter foreach += }
+  def ++=(iter: Traversible[A]) { iter foreach += }
 
   /** Clears the collection contents.
    */
diff --git a/src/library/scala/collection/generic/ImmutableMapBuilder.scala b/src/library/scala/collection/generic/ImmutableMapBuilder.scala
new file mode 100644
index 0000000000..028311e7e2
--- /dev/null
+++ b/src/library/scala/collection/generic/ImmutableMapBuilder.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scala.collection.generic
+
+// import collection.immutable.{List, Nil, ::}
+
+/** The canonical builder for collections that are addable, i.e. that support an efficient + method
+ *  which adds an element to the collection.
+ *  Collections are built from their empty element using this + method.
+ *  @param empty   The empty element of the collection.
+ */
+class ImmutableMapBuilder[A, B, Coll <: immutable.Map[A, B] with MapTemplate[A, B, Coll]](empty: Coll)
+extends Builder[(A, B), Coll, Any] {
+  protected var elems: Coll = empty
+  def +=(x: (A, B)) { elems = (elems + x).asInstanceOf[Coll] }
+  def clear() { elems = empty }
+  def result: Coll = elems
+}
diff --git a/src/library/scala/collection/generic/ImmutableMapFactory.scala b/src/library/scala/collection/generic/ImmutableMapFactory.scala
new file mode 100644
index 0000000000..54d4c90824
--- /dev/null
+++ b/src/library/scala/collection/generic/ImmutableMapFactory.scala
@@ -0,0 +1,16 @@
+package scala.collection.generic
+
+/** A template for companion objects of immutable.Map and subclasses thereof.
+ */
+abstract class ImmutableMapFactory[CC[A, +B] <: immutable.Map[A, B] with MapTemplate[A, B, CC[A, B]]] {
+
+  def newBuilder[A, B]: Builder[(A, B), CC[A, B], Any] = new ImmutableMapBuilder[A, B, CC[A, B]](empty[A, B])
+
+  def empty[A, B]: CC[A, B]
+
+  def apply[A, B](elems: (A, B)*): CC[A, B] = {
+    val b = newBuilder[A, B]
+    b ++= Iterable.fromOld(elems)
+    b.result
+  }
+}
diff --git a/src/library/scala/collection/generic/ImmutableMapTemplate.scala b/src/library/scala/collection/generic/ImmutableMapTemplate.scala
new file mode 100755
index 0000000000..5600996ae8
--- /dev/null
+++ b/src/library/scala/collection/generic/ImmutableMapTemplate.scala
@@ -0,0 +1,50 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Map.scala 16884 2009-01-09 16:52:09Z cunei $
+
+
+package scala.collection.generic
+
+/** A generic template for immutable maps from keys of type A to values of type B.
+ *  To implement a concrete map, you need to provide implementations of the following methods:
+ *  (where This is the type of the map in question):
+ *
+ *   def get(key: A): Option[B]
+ *   def elements: Iterator[(A, B)]
+ *   def add(key: A, value: B): This
+ *   def -(key: A): This
+ *
+ * If you wish that methods like, take, drop, filter return the same kind of map, you should also
+ * override:
+ *
+ *   def empty: This
+ *
+ * It is also good idea to override methods foreach and size for efficiency.
+ */
+trait ImmutableMapTemplate[A, +B, +This <: ImmutableMapTemplate[A, B, This] with immutable.Map[A, B]]
+  extends MapTemplate[A, B, This] {
+self =>
+
+  override protected[this] def newBuilder: Builder[(A, B), This, Any] = new ImmutableMapBuilder[A, B, This](empty)
+
+  /** This function transforms all the values of mappings contained
+   *  in this map with function <code>f</code>.
+   *
+   *  @param f A function over keys and values
+   *  @return  the updated map
+   */
+  def transform[C, That](f: (A, B) => C)(implicit bf: BuilderFactory[(A, C), That, This]): That = {
+    val b = bf(thisCollection)
+    for ((key, value) <- this) b += ((key, f(key, value)))
+    b.result
+  }
+
+  /** @deprecated use add instead */
+  @deprecated def update[B1 >: B](key: A, value: B1): immutable.Map[A, B1] = add(key, value).asInstanceOf[immutable.Map[A, B1]]
+}
diff --git a/src/library/scalax/collection/generic/OrderedIterableForwarder.scala b/src/library/scala/collection/generic/IterableForwarder.scala
index 643f31d861..f783f8c8fd 100755
--- a/src/library/scalax/collection/generic/OrderedIterableForwarder.scala
+++ b/src/library/scala/collection/generic/IterableForwarder.scala
@@ -9,29 +9,30 @@
 // $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
 
 
-package scalax.collection.generic
+package scala.collection.generic
+
+import collection.mutable.Buffer
 
 /** This trait implements a forwarder for iterable objects. It forwards
  *  all calls to a different iterable object, except for
  *
  *    - toString, hashCode, equals, stringPrefix
  *    - newBuilder, view
- *    - all calls creating a new iterable object of the same kind
+ *    - all calls creating a new iterable objetc of the same kind
  *
  *  The above methods are forwarded by subclass IterableProxy
  *
  *  @author  Martin Odersky
  *  @version 2.8
  */
-trait OrderedIterableForwarder[+A] extends OrderedIterable[A] with IterableForwarder[A] {
+trait IterableForwarder[+A] extends Iterable[A] with TraversibleForwarder[A] {
 
   /** The iterable object to which calls are forwarded */
-  protected def underlying: OrderedIterable[A]
+  protected def underlying: Iterable[A]
 
   // Iterable delegates
   // Iterable methods could be printed by  cat IterableTemplate.scala | sed -n '/trait Iterable/,$ p' | egrep '^  (override )?def'
 
-  override def last: A = underlying.last
-  override def lastOption: Option[A] = underlying.lastOption
-  override def sameElements[B >: A](that: OrderedIterable[B]): Boolean = underlying.sameElements(that)
+  override def elements = underlying.elements
+  override def sameElements[B >: A](that: Iterable[B]): Boolean = underlying.sameElements(that)
 }
diff --git a/src/library/scala/collection/generic/IterableProxyTemplate.scala b/src/library/scala/collection/generic/IterableProxyTemplate.scala
new file mode 100644
index 0000000000..577bfc24da
--- /dev/null
+++ b/src/library/scala/collection/generic/IterableProxyTemplate.scala
@@ -0,0 +1,32 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
+
+
+package scala.collection.generic
+
+import collection.mutable.Buffer
+
+// Methods could be printed by  cat IterableTemplate.scala | egrep '^  (override )?def'
+
+
+/** This trait implements a proxy for iterable objects. It forwards
+ *  all calls to a different iterable object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait IterableProxyTemplate[+A, +This <: IterableTemplate[A, This] with Iterable[A]] extends IterableTemplate[A, This] with TraversibleProxyTemplate[A, This] {
+  override def elements: Iterator[A] = self.elements
+  override def takeRight(n: Int): This = self.takeRight(n)
+  override def dropRight(n: Int): This = self.dropRight(n)
+  override def sameElements[B >: A](that: Iterable[B]): Boolean = self.sameElements(that)
+  override def view = self.view
+  override def view(from: Int, until: Int) = self.view(from, until)
+}
diff --git a/src/library/scala/collection/generic/IterableTemplate.scala b/src/library/scala/collection/generic/IterableTemplate.scala
new file mode 100755
index 0000000000..e0ec5426a9
--- /dev/null
+++ b/src/library/scala/collection/generic/IterableTemplate.scala
@@ -0,0 +1,186 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
+
+package scala.collection.generic
+
+import util.control.Breaks._
+// import immutable.Stream // !!!
+
+/** A template trait for iterable collections.
+ *
+ *  Collection classes mixing in this trait provide a method
+ *  <code>elements</code> which returns an iterator over all the
+ *  elements contained in the collection. They also provide a method `newBuilder`
+ *  which creates a builder for collections of the same kind.
+ *
+ *  This trait implements Traversible's `foreach` method by stepping through
+ *  all elements. Subclasses of `Iterable` should re-implement `foreach` with
+ *  something more efficient, if possible.
+ *
+ *  This trait adds methods `elements`, `sameElements`,
+ *  `takeRight`, `dropRight` to the methods inherited from trait `Traversible`.
+ *
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait IterableTemplate[+A, +This <: IterableTemplate[A, This] with Iterable[A]] extends TraversibleTemplate[A, This] { self =>
+
+  /** Creates a new iterator over all elements contained in this
+   *  iterable object.
+   *
+   *  @return the new iterator
+   */
+  def elements: Iterator[A]
+
+  /** Apply a function <code>f</code> to all elements of this
+   *  traversible object.
+   *
+   *  @param  f   a function that is applied to every element.
+   *  @note This method underlies the implementation of most other bulk operations.
+   *  It should be overridden in concrete collection classes with efficient implementations.
+   */
+  def foreach(f: A => Unit): Unit = elements.foreach(f)
+
+  /** Is this collection empty?
+   */
+  override def isEmpty: Boolean = !elements.hasNext
+
+  /** Combines the elements of this iterable together using the binary
+   *  function <code>f</code>, from right to left, and starting with
+   *  the value <code>z</code>.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
+   *          if the iterable is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
+   */
+  override def foldRight[B](z: B)(op: (A, B) => B): B =
+    elements.foldRight(z)(op)
+
+  /** Combines the elements of this iterable object together using the binary
+   *  operator <code>op</code>, from right to left
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   *  @param op  The operator to apply
+   *
+   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
+   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
+   *          a<sub>n</sub></code>.
+   *
+   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
+   */
+  override def reduceRight[B >: A](op: (A, B) => B): B =
+    elements.reduceRight(op)
+
+  /** The iterable itself */
+  override def toIterable: Iterable[A] = thisCollection
+
+  /** The first element of this iterable.
+   *
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   *  @throws Predef.NoSuchElementException if the iterable is empty.
+   */
+  override def head: A = if (isEmpty) throw new NoSuchElementException else elements.next
+
+  /** Returns the rightmost <code>n</code> elements from this iterable.
+   *
+   *  @param n the number of elements to take
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   */
+  def takeRight(n: Int): This = {
+    val b = newBuilder
+    val lead = elements drop n
+    var go = false
+    for (x <- this) {
+      if (lead.hasNext) lead.next
+      else go = true
+      if (go) b += x
+    }
+    b.result
+  }
+
+  /** Returns the iterable wihtout its rightmost <code>n</code> elements.
+   *
+   *  @param n the number of elements to take
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   */
+  def dropRight(n: Int): This = {
+    val b = newBuilder
+    val lead = elements drop n
+    breakable {
+      for (x <- this) {
+        if (!lead.hasNext) break
+        lead.next
+        b += x
+      }
+    }
+    b.result
+  }
+
+  /** Checks if the other iterable object contains the same elements as this one.
+   *
+   *  @note will not terminate for infinite-sized iterables.
+   *  @param that  the other iterable
+   *  @return true, iff both iterables contain the same elements.
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   */
+  def sameElements[B >: A](that: Iterable[B]): Boolean = {
+    val these = this.elements
+    val those = that.elements
+    while (these.hasNext && those.hasNext && these.next() == those.next()) {}
+    !these.hasNext && !those.hasNext
+  }
+
+  /** Returns a stream with all elements in this traversible object.
+   */
+  override def toStream: Stream[A] = elements.toStream
+
+  /** Creates a view of this iterable @see IterableView
+   */
+  override def view = new IterableView[A, This] {
+    protected lazy val underlying = self.thisCollection
+    override def elements = self.elements
+  }
+
+  /** A sub-iterable view  starting at index `from`
+   *  and extending up to (but not including) index `until`.
+   *
+   *  @param from   The index of the first element of the slice
+   *  @param until  The index of the element following the slice
+   *  @note  The difference between `view` and `slice` is that `view` produces
+   *         a view of the current iterable, whereas `slice` produces a new iterable.
+   *
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   *  @note view(from, to)  is equivalent to view.slice(from, to)
+   */
+  override def view(from: Int, until: Int) = view.slice(from, until)
+
+   /** @deprecated  use head instead */
+  @deprecated def first: A = head
+
+  /** @deprecated use headOption instead
+   *  <code>None</code> if traversible is empty.
+   */
+  @deprecated def firstOption: Option[A] = headOption
+
+  /** @deprecated use toSequence instead
+   */
+  @deprecated def toSeq: Sequence[A] = toSequence
+
+  /**
+   * returns a projection that can be used to call non-strict <code>filter</code>,
+   * <code>map</code>, and <code>flatMap</code> methods that build projections
+   * of the collection.
+   * @deprecated use view instead
+   */
+  @deprecated def projection = view
+}
diff --git a/src/library/scalax/collection/immutable/EmptyMap.scala b/src/library/scala/collection/generic/IterableView.scala
index c04d988f08..ab36b4550e 100644..100755
--- a/src/library/scalax/collection/immutable/EmptyMap.scala
+++ b/src/library/scala/collection/generic/IterableView.scala
@@ -5,30 +5,18 @@
 ** /____/\___/_/ |_/____/_/ | |                                         **
 **                          |/                                          **
 \*                                                                      */
+package scala.collection.generic
 
-// $Id: EmptyMap.scala 16893 2009-01-13 13:09:22Z cunei $
+import Math.MAX_INT
+import TraversibleView.NoBuilder
 
-
-
-package scalax.collection.immutable
-
-/** This class implements empty immutable maps
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
+/** A base class for views of Iterables.
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-@serializable
-class EmptyMap[A, B] extends Map[A, B] {
-
-  def size: Int = 0
-
-  def get(key: A): Option[B] = None
+trait IterableView[+A, +Coll <: Iterable[_]] extends IterableViewTemplate[A, Coll, IterableView[A, Coll]]
 
-  def elements: Iterator[(A, B)] = Iterator.empty
-
-  def update (key: A, value: B): Map[A, B] = new Map1(key, value)
-
-  def - (key: A): Map[A, B] = this
+object IterableView {
+  type Coll = TraversibleView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, IterableView[A, Iterable[_]], Coll] = new BuilderFactory[A, IterableView[A, Iterable[_]], Coll] { def apply(from: Coll) = new NoBuilder }
 }
-
-
-
diff --git a/src/library/scala/collection/generic/IterableViewTemplate.scala b/src/library/scala/collection/generic/IterableViewTemplate.scala
new file mode 100755
index 0000000000..99b6e23a1a
--- /dev/null
+++ b/src/library/scala/collection/generic/IterableViewTemplate.scala
@@ -0,0 +1,63 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.generic
+
+import Math.MAX_INT
+import TraversibleView.NoBuilder
+
+/** A base class for views of Iterables.
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait IterableViewTemplate[+A,
+                           +Coll <: Iterable[_],
+                           +This <: IterableView[A, Coll] with IterableViewTemplate[A, Coll, This]]
+extends Iterable[A] with IterableTemplate[A, This] with TraversibleView[A, Coll] with TraversibleViewTemplate[A, Coll, This]
+{ self =>
+
+  trait Transformed[+B] extends IterableView[B, Coll] with super.Transformed[B]
+
+  trait Sliced extends Transformed[A] with super.Sliced {
+    override def elements = self.elements slice (from, until)
+  }
+
+  trait Mapped[B] extends Transformed[B] with super.Mapped[B] {
+    override def elements = self.elements map mapping
+  }
+
+  trait FlatMapped[B] extends Transformed[B] with super.FlatMapped[B] {
+    override def elements = self.elements flatMap (mapping(_).toIterable.elements)
+  }
+
+  trait Appended[B >: A] extends Transformed[B] with super.Appended[B] {
+    override def elements = self.elements ++ rest.toIterable.elements
+  }
+
+  trait Filtered extends Transformed[A] with super.Filtered {
+    override def elements = self.elements filter pred
+  }
+
+  trait TakenWhile extends Transformed[A] with super.TakenWhile {
+    override def elements = self.elements takeWhile pred
+  }
+
+  trait DroppedWhile extends Transformed[A] with super.DroppedWhile {
+    override def elements = self.elements dropWhile pred
+  }
+
+  /** Boilerplate method, to override in each subclass
+   *  This method could be eliminated if Scala had virtual classes
+   */
+  protected override def newAppended[B >: A](that: Traversible[B]): Transformed[B] = new Appended[B] { val rest = that }
+  protected override def newMapped[B](f: A => B): Transformed[B] = new Mapped[B] { val mapping = f }
+  protected override def newFlatMapped[B](f: A => Traversible[B]): Transformed[B] = new FlatMapped[B] { val mapping = f }
+  protected override def newFiltered(p: A => Boolean): Transformed[A] = new Filtered { val pred = p }
+  protected override def newSliced(_from: Int, _until: Int): Transformed[A] = new Sliced { val from = _from; val until = _until }
+  protected override def newDroppedWhile(p: A => Boolean): Transformed[A] = new DroppedWhile { val pred = p }
+  protected override def newTakenWhile(p: A => Boolean): Transformed[A] = new TakenWhile { val pred = p }
+}
diff --git a/src/library/scala/collection/generic/LazyBuilder.scala b/src/library/scala/collection/generic/LazyBuilder.scala
new file mode 100755
index 0000000000..019827d5ad
--- /dev/null
+++ b/src/library/scala/collection/generic/LazyBuilder.scala
@@ -0,0 +1,27 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scala.collection.generic
+
+// import immutable.{List, Nil, ::}
+import mutable.ListBuffer
+
+/** A builder that constructs its result lazily. Iterators or iterables to
+ *  be added to this builder with `++=` are not evaluated until `result` is called.
+ */
+abstract class LazyBuilder[Elem, +To, -From] extends Builder[Elem, To, From] {
+  /** The different segments of elements to be added to the builder, represented as iterators */
+  protected var parts = new ListBuffer[Traversible[Elem]]
+  def +=(x: Elem) = { parts += List(x) }
+  override def ++=(xs: Iterator[Elem]) { parts += xs.toStream }
+  override def ++=(xs: Traversible[Elem]) { parts += xs }
+  def result(): To
+  def clear() { parts.clear() }
+}
diff --git a/src/library/scala/collection/generic/LinearSequenceTemplate.scala b/src/library/scala/collection/generic/LinearSequenceTemplate.scala
new file mode 100755
index 0000000000..30c2b92382
--- /dev/null
+++ b/src/library/scala/collection/generic/LinearSequenceTemplate.scala
@@ -0,0 +1,372 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import mutable.ListBuffer
+// import immutable.{List, Nil, ::}
+import generic._
+import util.control.Breaks._
+
+/** Class <code>Linear[A]</code> represents linear sequences of elements.
+ *  For such sequences `isEmpty`, `head` and `tail` are guaranteed to be
+ *  efficient constant time (or near so) operations.
+ *  It does not add any methods to Sequence but overrides several
+ *  methods with optimized implementations.
+ *
+ *  @author  Martin Odersky
+ *  @author  Matthias Zenger
+ *  @version 1.0, 16/07/2003
+ */
+trait LinearSequenceTemplate[+A, +This <: LinearSequenceTemplate[A, This] with LinearSequence[A]] extends SequenceTemplate[A, This] { self =>
+
+  /** Abstract method to be implemented in a subclass */
+  def isEmpty: Boolean
+
+  /** Abstract method to be implemented in a subclass */
+  def head: A
+
+  /** Abstract method to be implemented in a subclass */
+  def tail: This
+
+   /** Returns the number of elements in the linear sequence.
+    */
+  def length: Int = {
+    var these = self
+    var len = 0
+    while (!these.isEmpty) {
+      len += 1
+      these = these.tail
+    }
+    len
+  }
+
+  /** Returns the <code>n</code>-th element of this linear sequence. The first element
+   *  (head of the linear sequence) is at position 0.
+   *
+   *  @param n index of the element to return
+   *  @return  the element at position <code>n</code> in this linear sequence.
+   *  @throws Predef.NoSuchElementException if the linear sequence is too short.
+   */
+  def apply(n: Int): A = drop(n).head
+
+  /** Returns the elements in the sequence as an iterator
+   */
+  override def elements: Iterator[A] = new Iterator[A] {
+    var these = self
+    def hasNext: Boolean = !these.isEmpty
+    def next: A =
+      if (hasNext) {
+        val result = these.head; these = these.tail; result
+      } else Iterator.empty.next
+    override def toList: List[A] = these.toList
+  }
+
+  /** Apply the given function <code>f</code> to each element of this linear sequence
+   *  (while respecting the order of the elements).
+   *
+   *  @param f the treatment to apply to each element.
+   */
+  override def foreach(f: A => Unit) {
+    var these = this
+    while (!these.isEmpty) {
+      f(these.head)
+      these = these.tail
+    }
+  }
+
+  /** Tests if the predicate <code>p</code> is satisfied by all elements
+   *  in this list.
+   *
+   *  @param p the test predicate.
+   *  @return  <code>true</code> iff all elements of this list satisfy the
+   *           predicate <code>p</code>.
+   */
+  override def forall(p: A => Boolean): Boolean = {
+    var these = this
+    while (!these.isEmpty) {
+      if (!p(these.head)) return false
+      these = these.tail
+    }
+    true
+  }
+
+  /** Tests the existence in this list of an element that satisfies the
+   *  predicate <code>p</code>.
+   *
+   *  @param p the test predicate.
+   *  @return  <code>true</code> iff there exists an element in this list that
+   *           satisfies the predicate <code>p</code>.
+   */
+  override def exists(p: A => Boolean): Boolean = {
+    var these = this
+    while (!these.isEmpty) {
+      if (p(these.head)) return true
+      these = these.tail
+    }
+    false
+  }
+
+  /** Count the number of elements in the iterable which satisfy a predicate.
+   *
+   *  @param p the predicate for which to count
+   *  @return  the number of elements satisfying the predicate <code>p</code>.
+   */
+  override def count(p: A => Boolean): Int = {
+    var these = this
+    var cnt = 0
+    while (!these.isEmpty) {
+      if (p(these.head)) cnt += 1
+      these = these.tail
+    }
+    cnt
+  }
+
+  /** Find and return the first element of the list satisfying a
+   *  predicate, if any.
+   *
+   *  @param p the predicate
+   *  @return the first element in the list satisfying <code>p</code>,
+   *  or <code>None</code> if none exists.
+   */
+  override def find(p: A => Boolean): Option[A] = {
+    var these = this
+    while (!these.isEmpty) {
+      if (p(these.head)) return Some(these.head)
+      these = these.tail
+    }
+    None
+  }
+
+  /** Combines the elements of this list together using the binary
+   *  function <code>f</code>, from left to right, and starting with
+   *  the value <code>z</code>.
+   *
+   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
+   *          a<sub>n</sub>)</code> if the list is
+   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
+   */
+  override def foldLeft[B](z: B)(f: (B, A) => B): B = {
+    var acc = z
+    var these = this
+    while (!these.isEmpty) {
+      acc = f(acc, these.head)
+      these = these.tail
+    }
+    acc
+  }
+
+  /** Combines the elements of this list together using the binary
+   *  function <code>f</code>, from right to left, and starting with
+   *  the value <code>z</code>.
+   *
+   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
+   *          if the list is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
+   */
+  override def foldRight[B](z: B)(f: (A, B) => B): B =
+    if (this.isEmpty) z
+    else f(head, tail.foldRight(z)(f))
+
+  /** Combines the elements of this list together using the binary
+   *  operator <code>op</code>, from left to right
+   *  @param op  The operator to apply
+   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
+      if the list has elements
+   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
+   *  @throws Predef.UnsupportedOperationException if the list is empty.
+   */
+  override def reduceLeft[B >: A](f: (B, A) => B): B =
+    if (isEmpty) throw new UnsupportedOperationException("empty.reduceLeft")
+    else tail.foldLeft[B](head)(f)
+
+  /** Combines the elements of this iterable object together using the binary
+   *  operator <code>op</code>, from right to left
+   *  @note Will not terminate for infinite-sized collections.
+   *  @param op  The operator to apply
+   *
+   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
+   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
+   *          a<sub>n</sub></code>.
+   *
+   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
+   */
+  override def reduceRight[B >: A](op: (A, B) => B): B =
+    if (isEmpty) throw new UnsupportedOperationException("Nil.reduceRight")
+    else if (tail.isEmpty) head
+    else op(head, tail.reduceRight(op))
+
+  /** The last element of this linear sequence.
+   *
+   *  @throws Predef.NoSuchElementException if the linear sequence is empty.
+   */
+  override def last: A = {
+    if (isEmpty) throw new NoSuchElementException
+    var these = this
+    var nx = these.tail
+    while (!nx.isEmpty) {
+      these = nx
+      nx = nx.tail
+    }
+    these.head
+  }
+
+  override def take(n: Int): This = {
+    val b = newBuilder
+    var i = 0
+    var these = this
+    while (!these.isEmpty && i < n) {
+      i += 1
+      b += these.head
+      these = these.tail
+    }
+    b.result
+  }
+
+  override def drop(n: Int): This = {
+    var these: This = thisCollection
+    var count = n
+    while (!these.isEmpty && count > 0) {
+      these = these.tail
+      count -= 1
+    }
+    these
+  }
+
+  /** Returns the rightmost <code>n</code> elements from this iterable.
+   *  @param n the number of elements to take
+   */
+  override def dropRight(n: Int): This = {
+    val b = newBuilder
+    var these = this
+    var lead = this drop n
+    while (!lead.isEmpty) {
+      b += these.head
+      these = these.tail
+      lead = lead.tail
+    }
+    b.result
+  }
+
+  /** Returns a pair consisting of the longest prefix of the linear sequence whose
+   *  elements all satisfy the given predicate, and the rest of the linear sequence.
+   *
+   *  @param p the test predicate
+   */
+  override def span(p: A => Boolean): (This, This) = {
+    var these: This = thisCollection
+    val b = newBuilder
+    while (!these.isEmpty && p(these.head)) {
+      b += these.head
+      these = these.tail
+    }
+    (b.result, these)
+  }
+
+  /** Returns true iff the other linear sequence contains the same elements as this one.
+   *
+   *  @note will not terminate for two infinite-sized linear sequences.
+   *  @param that  the other linear sequence
+   */
+  override def sameElements[B >: A](that: Iterable[B]): Boolean = that match {
+    case that1: LinearSequence[_] =>
+      val these = this
+      val those = that1
+      while (!these.isEmpty && !those.isEmpty && these.head == those.head) {}
+      these.isEmpty && those.isEmpty
+    case _ => super.sameElements(that)
+  }
+
+  // Overridden methods from Sequence
+
+  /** Result of comparing <code>length</code> with operand <code>len</code>.
+   *  returns <code>x</code> where
+   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; len</code>
+   *  <code>x == 0</code>   iff    <code>this.length == len</code>
+   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; len</code>.
+   */
+  override def lengthCompare(len: Int): Int =  {
+    var i = 0
+    var these = self
+    while (!these.isEmpty && i <= len) {
+      i += 1
+      these = these.tail
+    }
+    i - len
+  }
+
+  /** Is this partial function defined for the index <code>x</code>?
+   */
+  override def isDefinedAt(x: Int): Boolean = x >= 0 && lengthCompare(x) > 0
+
+  /** Returns length of longest segment starting from a start index `from`
+   *  such that every element of the segment satisfies predicate `p`.
+   *  @note may not terminate for infinite-sized collections.
+   *  @param  p the predicate
+   *  @param  from  the start index
+   */
+  override def segmentLength(p: A => Boolean, from: Int): Int = {
+    var i = 0
+    var these = this drop from
+    while (!these.isEmpty && p(these.head)) {
+      i += 1
+      these = these.tail
+    }
+    i
+  }
+
+  /** Returns index of the first element starting from a start index
+   *  satisying a predicate, or -1, if none exists.
+   *
+   *  @note may not terminate for infinite-sized linear sequences.
+   *  @param  p the predicate
+   *  @param  from  the start index
+   */
+  override def indexWhere(p: A => Boolean, from: Int): Int = {
+    var i = from
+    var these = this drop from
+    while (!these.isEmpty && !p(these.head)) {
+      i += 1
+      these = these.tail
+    }
+    if (these.isEmpty) -1 else i
+  }
+
+  /** Returns index of the last element satisying a predicate, or -1, if none exists.
+   *
+   *  @param  p the predicate
+   *  @return   the index of the last element satisfying <code>p</code>,
+   *            or -1 if such an element does not exist
+   */
+  override def lastIndexWhere(p: A => Boolean, end: Int): Int = {
+    var i = 0
+    var these = this
+    var last = -1
+    while (!these.isEmpty && i <= end) {
+      if (p(these.head)) last = i
+      these = these.tail
+      i += 1
+    }
+    last
+  }
+
+  override def equals(that: Any): Boolean = that match {
+    case that1: LinearSequence[a] =>
+      var these = this
+      var those = that1
+      while (!these.isEmpty && !those.isEmpty && these.head == those.head) {
+        these = these.tail
+        those = those.tail
+      }
+      these.isEmpty && those.isEmpty
+    case _ =>
+      super.equals(that)
+  }
+}
diff --git a/src/library/scala/collection/generic/LinkedListTemplate.scala b/src/library/scala/collection/generic/LinkedListTemplate.scala
new file mode 100755
index 0000000000..4abb6ceffb
--- /dev/null
+++ b/src/library/scala/collection/generic/LinkedListTemplate.scala
@@ -0,0 +1,89 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: SingleLinkedList.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+package scala.collection.generic
+
+/** This extensible class may be used as a basis for implementing linked
+ *  list. Type variable <code>A</code> refers to the element type of the
+ *  list, type variable <code>This</code> is used to model self types of
+ *  linked lists.
+ *  !!! todo: integrate with LinearSequence, need to drop null then.
+ *  @author  Matthias Zenger
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait LinkedListTemplate[A, This >: Null <: Sequence[A] with LinkedListTemplate[A, This]] extends SequenceTemplate[A, This] { self =>
+
+  var elem: A = _
+  var next: This = _
+
+  override def isEmpty = false
+
+  override def length: Int = 1 + (if (next eq null) 0 else next.length)
+
+  override def head: A = elem
+
+  override def tail: This = next
+
+  def append(that: This): Unit =
+    if (next eq null) next = that else next.append(that)
+
+  def insert(that: This): Unit = if (that ne null) {
+    that.append(next)
+    next = that
+  }
+
+  override def drop(n: Int): This = {
+    var i = 0
+    var these: This = thisCollection
+    while (i < n && (these ne null)) {
+      these = these.next.asInstanceOf[This] // !!! concrete overrides abstract problem
+      i += 1
+    }
+    these
+  }
+
+  override def apply(n: Int): A = {
+    val loc = drop(n)
+    if (loc ne null) loc.elem
+    else throw new IndexOutOfBoundsException(n.toString)
+  }
+
+  def update(n: Int, x: A) {
+    val loc = drop(n)
+    if (loc ne null) loc.elem = x
+    else throw new IndexOutOfBoundsException(n.toString)
+  }
+
+  def get(n: Int): Option[A] = {
+    val loc = drop(n)
+    if (loc ne null) Some(loc.elem)
+    else None
+  }
+
+  override def elements: Iterator[A] = new Iterator[A] {
+    var elems = self
+    def hasNext = (elems ne null)
+    def next = {
+      val res = elems.elem
+      elems = elems.next
+      res;
+    }
+  }
+
+  override def foreach(f: A => Unit): Unit = {
+    var these = this
+    while (these ne null) {
+      f(these.elem);
+      these = these.next
+    }
+  }
+}
diff --git a/src/library/scalax/collection/generic/MapTemplate.scala b/src/library/scala/collection/generic/MapTemplate.scala
index 6d1a9e3c93..4be5fb2fb9 100755
--- a/src/library/scalax/collection/generic/MapTemplate.scala
+++ b/src/library/scala/collection/generic/MapTemplate.scala
@@ -9,53 +9,39 @@
 // $Id: Map.scala 16884 2009-01-09 16:52:09Z cunei $
 
 
-package scalax.collection.generic
-
-import collection.immutable.Set
-import collection.mutable.ArrayBuffer
-import annotation.unchecked.uncheckedVariance
-
-/** <p>
-*     A map is a collection that maps each key to one or zero values.
- *  </p>
- *  <p>
- *    This trait provides a limited interface, only allowing reading of elements.
- *    There are two extensions of this trait, in packages
- *    <code><a href="mutable$content.html" target="contentFrame">
- *    scala.collection.mutable</a></code>
- *    and <code><a href="immutable$content.html" target="contentFrame">
- *    scala.collection.immutable</a></code>, which provide functionality for
- *    adding new key/value mappings to a map. The trait in the first package is
- *    for maps that are modified destructively, whereas the trait in
- *    the second package is for immutable maps which create a new map
- *    when something is added or removed from them.
- *  </p>
+package scala.collection.generic
+
+/** A generic template for maps from keys of type A to values of type B.
+ *  To implement a concrete map, you need to provide implementations of the following methods:
+ *  (where This is the type of the map in question):
+ *
+ *   def get(key: A): Option[B]
+ *   def elements: Iterator[(A, B)]
+ *   def add[B1 >: B](key: A, value: B1): This
+ *   def -(key: A): This
+ *
+ * If you wish that methods like, take, drop, filter return the same kind of map, you should also
+ * override:
+ *
+ *   def empty: This
  *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 1.2, 31/12/2006
+ * It is also good idea to override methods foreach and size for efficiency.
  */
-trait MapTemplate[A, B, +CC[A1, B1] <: Map[A1, B1] with MapTemplate[A1, B1, CC]]
+trait MapTemplate[A, +B, +This <: MapTemplate[A, B, This] with Map[A, B]]
   extends PartialFunction[A, B]
-     with SizedIterable[(A, B)]
-     with Addable[CC[A, B], (A, B)]
-     with Subtractable[CC[A, B], A] {
-self: CC[A, B] =>
+     with IterableTemplate[(A, B), This]
+     with Subtractable[A, This] {
+self =>
 
-  def newBuilder[B]: Builder[SizedIterable, B] = new ArrayBuffer[B]
+//  import immutable.{Set, FlexSet}
 
-  override def thisCC: CC[A, B] = this
+  def empty: This
 
-  /** This method returns a new map instance of the same class
-   *  mapping keys of the same type to values of type <code>C</code>.
-   */
-  def empty[C]: CC[A, C]
-
-  /** Compute the number of key-to-value mappings.
+  /** Is this an empty map?
    *
-   *  @return the number of mappings
+   *  @return <code>true</code> iff the map is empty.
    */
-  def size: Int
+  override def isEmpty: Boolean = size == 0
 
   /** Check if this map maps <code>key</code> to a value and return the
    *  value if it exists.
@@ -68,17 +54,10 @@ self: CC[A, B] =>
   /** Check if this map maps <code>key</code> to a value.
     *  Return that value if it exists, otherwise return <code>default</code>.
     */
-  def getOrElse[B2 >: B](key: A, default: => B2): B2 =
-    get(key) match {
-      case Some(v) => v
-      case None => default
-    }
-
-  /** Is this an empty map?
-   *
-   *  @return <code>true</code> iff the map is empty.
-   */
-  override def isEmpty: Boolean = size == 0
+  def getOrElse[B1 >: B](key: A, default: => B1): B1 = get(key) match {
+    case Some(v) => v
+    case None => default
+  }
 
   /** Retrieve the value which is associated with the given key. This
    *  method throws an exception if there is no mapping from the given
@@ -119,17 +98,19 @@ self: CC[A, B] =>
     def next = iter.next._1
   }
 
-  /** @return the keys of this map as a set.
-   */
-  def keySet: Set[A] = new Set[A] {
-    def size = self.size
+  protected class DefaultKeySet extends Set[A] {
     def contains(key : A) = self.contains(key)
     def elements = self.elements.map(_._1)
-    def + (elem: A): Set[A] = immutable.Set[A]() ++ this + elem
-    def - (elem: A): Set[A] = immutable.Set[A]() ++ this - elem
-    override def newBuilder[B]: Builder[Set, B] = Set.newBuilder[B]
+    def + (elem: A): Set[A] = (Set[A]() ++ this + elem).asInstanceOf[Set[A]] // !!! concrete overrides abstract problem
+    def - (elem: A): Set[A] = (Set[A]() ++ this - elem).asInstanceOf[Set[A]] // !!! concrete overrides abstract problem
+    override def size = self.size
+    override def foreach(f: A => Unit) = for ((k, v) <- self) f(k)
   }
 
+  /** @return the keys of this map as a set.
+   */
+  def keySet: Set[A] = new DefaultKeySet
+
   /** Creates an iterator for a contained values.
    *
    *  @return an iterator over all values.
@@ -140,13 +121,6 @@ self: CC[A, B] =>
     def next = iter.next._2
   }
 
-  /** Creates a string representation for this map.
-   *
-   *  @return    a string showing all mappings
-   */
-  override def toString() =
-    elements.toList.map(kv => kv._1 + " -> " + kv._2).mkString(stringPrefix + "(", ", ", ")")
-
   /** The default value for the map, returned when a key is not found
    *  The method implemented here yields an error,
    *  but it might be overridden in subclasses.
@@ -157,47 +131,53 @@ self: CC[A, B] =>
   def default(key: A): B =
     throw new NoSuchElementException("key not found: " + key)
 
-/*
-  override def view: Map.View[A,B] = new Map.View[A, B] {
-    override def elements = self.elements
-    override def size = self.size
-    override def get(key: A): Option[B] = self.get(key)
-  }
-*/
-  def filterKeys(p: A => Boolean) = new MapView[CC, A, B] {
-    val origin = self
+  /** A map view consisting only of those key value pairs where the key satisfies a given
+   *  predicate `p`.
+   */
+  def filterKeys(p: A => Boolean) = new DefaultMap[A, B] {
     override def foreach(f: ((A, B)) => Unit): Unit = for (kv <- self) if (p(kv._1)) f(kv)
     def elements = self.elements.filter(kv => p(kv._1))
-    def size = { var sz = 0; foreach(_ => sz += 1); sz }
     override def contains(key: A) = self.contains(key) && p(key)
     def get(key: A) = if (!p(key)) None else self.get(key)
   }
 
-  def mapElements[C](f: B => C) = new MapView[CC, A,C] {
-    val origin = self
+  /** A map view resulting from applying a given function `f` to each value.
+   */
+  def mapValues[C](f: B => C) = new DefaultMap[A, C] {
     override def foreach(g: ((A, C)) => Unit): Unit = for ((k, v) <- self) g((k, f(v)))
     def elements = for ((k, v) <- self.elements) yield (k, f(v))
-    def size = self.size
+    override def size = self.size
     override def contains(key: A) = self.contains(key)
     def get(key: A) = self.get(key).map(f)
   }
 
-  /** Defines the prefix of this object's <code>toString</code> representation.
+  /** @deprecated  use mapValues instead
    */
-  override def stringPrefix: String = "Map"
+  @deprecated def mapElements[C](f: B => C) = mapValues(f)
 
   /** Add a key/value pair to this map.
    *  @param    key the key
    *  @param    value the value
    *  @return   A new map with the new binding added to this map
    */
-  def update (key: A, value: B): CC[A, B]
+  def add [B1 >: B](key: A, value: B1): Map[A, B1]
 
   /** Add a key/value pair to this map.
-   *  @param    kv the key/value pair.
+   *  @param    kv the key/value pair
    *  @return   A new map with the new binding added to this map
    */
-  def + (kv: (A, B)): CC[A, B] = update(kv._1, kv._2)
+  def + [B1 >: B] (kv: (A, B1)): Map[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): Map[A, B1] =
+    (this + elem1 + elem2).++(collection.Iterable.fromOld(elems))(Map.builderFactory)
 
   /** Remove a key from this map
    *  @param    key the key to be removed
@@ -205,43 +185,58 @@ self: CC[A, B] =>
    *            it is returned unchanged. Otherwise, return a new map
    *            without a binding for <code>key</code>
    */
-  def - (key: A): CC[A, B]
+  def - (key: A): This
 
-  /** This function transforms all the values of mappings contained
-   *  in this map with function <code>f</code>.
-   *
-   *  @param f A function over keys and values
-   *  @return  the updated map
-   */
-  def transform[C](f: (A, B) => C): CC[A, C] = {
-    var res = empty[C]
-    for ((key, value) <- this) res += ((key, f(key, value)))
-    res
-  }
-
-  /** Builds a new map with all key/value pairs of this map
-   *  for which the predicate <code>p</code> returns <code>true</code>.
+  /** Removes all the mappings for which the predicate
+   *  <code>p</code> returns <code>true</code>.
    *
    *  @param p A predicate over key-value pairs
    *  @return  the updated map
    */
-  override def filter(p: ((A, B)) => Boolean): CC[A, B] = {
-    var res = empty[B]
+  override def remove(p: ((A, B)) => Boolean): This = {
+    var res: This = thisCollection
     for (kv <- this)
-      if (p(kv)) res += kv
+      if (p(kv)) res = (res - kv._1).asInstanceOf[This] // !!! concrete overrides abstract problem
     res
   }
 
-  /** Removes all the mappings for which the predicate
-   *  <code>p</code> returns <code>false</code>.
+  /** Creates a string representation for this map.
    *
-   *  @param p A predicate over key-value pairs
-   *  @return  the updated map
+   *  @return    a string showing all mappings
    */
-  override def remove(p: ((A, B)) => Boolean): CC[A, B] = {
-    var res = this
-    for (kv <- this)
-      if (!p(kv)) res -= kv._1
-    res
+  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder =
+    elements.map { case (k, v) => k+" -> "+v }.addString(b, start, sep, end)
+
+  /** Compares two maps structurally; i.e. checks if all mappings
+   *  contained in this map are also contained in the other map,
+   *  and vice versa.
+   *
+   *  @param that the other map
+   *  @return     <code>true</code> iff both maps contain exactly the
+   *              same mappings.
+   */
+  override def equals(that: Any): Boolean = that match {
+    case other: Map[a, b] =>
+      if (this.size == other.size)
+        try { // can we find a safer way to do this?
+          this forall {
+            case (key, value) => other.get(key.asInstanceOf[a]) match {
+              case None => false
+              case Some(otherval) => value == otherval
+            }
+          }
+        } catch {
+          case ex: ClassCastException => false
+        }
+      else false
+    case _ => false
   }
+
+  /** Defines the prefix of this object's <code>toString</code> representation.
+   */
+  override def stringPrefix: String = "Map"
+
+  /** Need to override string, so that it's not the Function1's string that gets mixed in.
+   */
+  override def toString = super[IterableTemplate].toString
 }
diff --git a/src/library/scala/collection/generic/MutableMapBuilder.scala b/src/library/scala/collection/generic/MutableMapBuilder.scala
new file mode 100644
index 0000000000..04b3066bdb
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableMapBuilder.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scala.collection.generic
+
+// import collection.immutable.{List, Nil, ::}
+
+/** The canonical builder for collections that are addable, i.e. that support an efficient + method
+ *  which adds an element to the collection.
+ *  Collections are built from their empty element using this + method.
+ *  @param empty   The empty element of the collection.
+ */
+class MutableMapBuilder[A, B, Coll <: mutable.Map[A, B] with MapTemplate[A, B, Coll]](empty: Coll)
+extends Builder[(A, B), Coll, Any] {
+  protected var elems: Coll = empty
+  def +=(x: (A, B)) { elems += x }
+  def clear() { elems = empty }
+  def result: Coll = elems
+}
diff --git a/src/library/scala/collection/generic/MutableMapFactory.scala b/src/library/scala/collection/generic/MutableMapFactory.scala
new file mode 100644
index 0000000000..9c15d5ceec
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableMapFactory.scala
@@ -0,0 +1,16 @@
+package scala.collection.generic
+
+/** A template for companion objects of mutable.Map and subclasses thereof.
+ */
+abstract class MutableMapFactory[CC[A, B] <: mutable.Map[A, B] with MutableMapTemplate[A, B, CC[A, B]]] {
+
+  def newBuilder[A, B]: Builder[(A, B), CC[A, B], Any] = new MutableMapBuilder(empty[A, B])
+
+  def empty[A, B]: CC[A, B]
+
+  def apply[A, B](elems: (A, B)*): CC[A, B] = {
+    val b = newBuilder[A, B]
+    b ++= Iterable.fromOld(elems)
+    b.result
+  }
+}
diff --git a/src/library/scala/collection/generic/MutableMapTemplate.scala b/src/library/scala/collection/generic/MutableMapTemplate.scala
new file mode 100644
index 0000000000..3a5801c1df
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableMapTemplate.scala
@@ -0,0 +1,173 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Map.scala 16884 2009-01-09 16:52:09Z cunei $
+
+
+package scala.collection.generic
+
+/** A generic template for maps from keys of type A to values of type B.
+ *  To implement a concrete map, you need to provide implementations of the following methods:
+ *  (where This is the type of the map in question):
+ *
+ *   def get(key: A): Option[B]
+ *   def elements: Iterator[(A, B)]
+ *   def update(key: A, value: B)
+ *   def -(key: A): This
+ *
+ * If you wish that methods like, take, drop, filter return the same kind of map, you should also
+ * override:
+ *
+ *   def empty: This
+ *
+ * It is also good idea to override methods foreach and size for efficiency.
+ */
+trait MutableMapTemplate[A, B, +This <: MutableMapTemplate[A, B, This] with mutable.Map[A, B]]
+  extends MapTemplate[A, B, This]
+     with Builder[(A, B), This, Any]
+     with Growable[(A, B)]
+     with Shrinkable[A]
+     with Cloneable[This]
+{ self =>
+
+  override protected[this] def newBuilder: Builder[(A, B), This, Any] = new MutableMapBuilder[A, B, This](empty.asInstanceOf[This]) // !!! concrete overrides abstract problem
+
+  /** This method allows one to add a new mapping from <code>key</code>
+   *  to <code>value</code> to the map. If the map already contains a
+   *  mapping for <code>key</code>, it will be overridden by this
+   *  function.
+   *
+   * @param key    The key to update
+   * @param value  The new value
+   */
+  def update(key: A, value: B)
+
+  /** Add a key/vaue pair to this map, and return the map itself
+   */
+  def add(key: A, value: B): this.type = { update(key, value); this }
+
+  /** Map <code>key</code> to <code>elem</code> in this map and return the element
+   *  that the key was previously mapped to (if any).
+   */
+  def put(key: A, elem: B): Option[B] = {
+    val ret = get(key)
+    this(key) = elem
+    ret
+  }
+
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair.
+   */
+  def += (kv: (A, B)) { update(kv._1, kv._2) }
+
+  /** A default implementation of addition where the value is not of the same type as
+   *  the current map value type. This will always create a new immutable Map.
+   */
+  def add[B1 >: B](key: A, value: B1): collection.Map[A, B1] =
+    Map[A, B1]() ++ thisCollection + ((key, value))
+
+  /** Adds a single element to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added element.
+   *
+   *  @param elem  the element to add.
+   */
+  //override
+   def +(kv: (A, B)): this.type = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  //override
+  def +(elem1: (A, B), elem2: (A, B), elems: (A, B)*): this.type =
+    this + elem1 + elem2 ++ Iterable.fromOld(elems)
+
+  /** Adds a number of elements provided by an iterable object
+   *  via its <code>elements</code> method and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param iter     the iterable object.
+   */
+  //override
+  def ++(iter: Traversible[(A, B)]): this.type = { (this /: iter) (_ + _); this }
+
+  /** Adds a number of elements provided by an iterator
+   *  via its <code>elements</code> method and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param iter   the iterator
+   */
+  //override
+  def ++(iter: Iterator[(A, B)]): this.type = { (this /: iter) (_ + _); this }
+
+  /** Remove a key from this map, noop if key is not presentg.
+   *  @param    key the key to be removed
+   */
+  def -= (key: A)
+
+  def -(key: A): This = { -=(key); thisCollection }
+
+  def removeKey(key: A): Option[B] = {
+    val ret = get(key)
+    this -= key
+    ret
+  }
+
+  // todo: add other -'s
+
+  /** Removes all elements from the set. After this operation is completed,
+   *  the set will be empty.
+   */
+  def clear() { for ((k, v) <- elements) -=(k) }
+
+  /** Check if this map maps <code>key</code> to a value.
+    * Return that value if it exists, otherwise put <code>default</code>
+    * as that key's value and return it.
+    */
+  def getOrElseUpdate(key: A, default: => B): B =
+    get(key) match {
+      case Some(v) => v
+      case None => val d = default; this(key) = d; d
+    }
+
+  /** This function transforms all the values of mappings contained
+   *  in this map with function <code>f</code>.
+   *
+   * @param f  The transformation to apply
+   */
+  def transform(f: (A, B) => B): this.type = {
+    elements foreach {
+      case (key, value) => update(key, f(key, value))
+    }
+    this
+  }
+
+  /** This method retains only those mappings for which the predicate
+   *  <code>p</code> returns <code>true</code>.
+   *
+   * @param p  The test predicate
+   * @deprecated cannot be type inferred because if retain in Iterable.
+   */
+  def retain(p: (A, B) => Boolean): this.type = {
+    for ((k, v) <- this) if (!p(k, v)) -=(k)
+    this
+  }
+
+  override def clone(): This =
+    empty ++ thisCollection
+
+  /** The result when this map is used as a builder */
+  def result: This = thisCollection
+}
diff --git a/src/library/scala/collection/generic/MutableVectorTemplate.scala b/src/library/scala/collection/generic/MutableVectorTemplate.scala
new file mode 100755
index 0000000000..cfc65de9ec
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableVectorTemplate.scala
@@ -0,0 +1,38 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.generic
+
+/** A subtrait of collection.Vector which represents sequences
+ *  that can be mutated.
+ */
+trait MutableVectorTemplate[A, +This <: MutableVectorTemplate[A, This] with mutable.Vector[A]] extends VectorTemplate[A, This] { self =>
+
+  def update(idx: Int, elem: A)
+
+  /** Creates a view of this iterable @see Iterable.View
+   */
+  override def view = new MutableVectorView[A, This] {
+    protected lazy val underlying = self.thisCollection
+    override def elements = self.elements
+    override def length = self.length
+    override def apply(idx: Int) = self.apply(idx)
+    override def update(idx: Int, elem: A) = self.update(idx, elem)
+  }
+
+  /** A sub-sequence view  starting at index `from`
+   *  and extending up to (but not including) index `until`.
+   *
+   *  @param from   The index of the first element of the slice
+   *  @param until  The index of the element following the slice
+   *  @note  The difference between `view` and `slice` is that `view` produces
+   *         a view of the current sequence, whereas `slice` produces a new sequence.
+   *
+   *  @note view(from, to)  is equivalent to view.slice(from, to)
+   */
+  override def view(from: Int, until: Int) = view.slice(from, until)
+}
diff --git a/src/library/scala/collection/generic/MutableVectorView.scala b/src/library/scala/collection/generic/MutableVectorView.scala
new file mode 100755
index 0000000000..4b7ece1dab
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableVectorView.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait MutableVectorView[A, +Coll <: mutable.Vector[_]] extends MutableVectorViewTemplate[A, Coll, MutableVectorView[A, Coll]]
+
+object MutableVectorView {
+  type Coll = TraversibleView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, MutableVectorView[A, mutable.Vector[_]], Coll] = new BuilderFactory[A, MutableVectorView[A, mutable.Vector[_]], Coll] { def apply(from: Coll) = new NoBuilder }
+}
diff --git a/src/library/scala/collection/generic/MutableVectorViewTemplate.scala b/src/library/scala/collection/generic/MutableVectorViewTemplate.scala
new file mode 100755
index 0000000000..22b46472c7
--- /dev/null
+++ b/src/library/scala/collection/generic/MutableVectorViewTemplate.scala
@@ -0,0 +1,66 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait MutableVectorViewTemplate[A,
+                                +Coll <: mutable.Vector[_],
+                                +This <: MutableVectorView[A, Coll] with MutableVectorViewTemplate[A, Coll, This]]
+  extends mutable.Vector[A] with MutableVectorTemplate[A, This] with VectorView[A, Coll] with VectorViewTemplate[A, Coll, This]
+{ self =>
+
+  trait Transformed[B] extends MutableVectorView[B, Coll] with super.Transformed[B] {
+    def update(idx: Int, elem: B)
+  }
+
+  trait Sliced extends Transformed[A] with super.Sliced {
+    override def update(idx: Int, elem: A) =
+      if (idx + from < until) self.update(idx + from, elem)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait Filtered extends Transformed[A] with super.Filtered {
+    override def update(idx: Int, elem: A) = self.update(index(idx), elem)
+  }
+
+  trait TakenWhile extends Transformed[A] with super.TakenWhile {
+    override def update(idx: Int, elem: A) =
+      if (idx < len) self.update(idx, elem)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait DroppedWhile extends Transformed[A] with super.DroppedWhile {
+    override def update(idx: Int, elem: A) =
+      if (idx >= 0) self.update(idx + start, elem)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait Reversed extends Transformed[A] with super.Reversed {
+    override def update(idx: Int, elem: A) = self.update(length - 1 - idx, elem)
+  }
+
+  /** Boilerplate method, to override in each subclass
+   *  This method could be eliminated if Scala had virtual classes
+   */
+  protected override def newFiltered(p: A => Boolean): Transformed[A] = new Filtered { val pred = p }
+  protected override def newSliced(_from: Int, _until: Int): Transformed[A] = new Sliced { val from = _from; val until = _until }
+  protected override def newDroppedWhile(p: A => Boolean): Transformed[A] = new DroppedWhile { val pred = p }
+  protected override def newTakenWhile(p: A => Boolean): Transformed[A] = new TakenWhile { val pred = p }
+  protected override def newReversed: Transformed[A] = new Reversed { }
+}
+
diff --git a/src/library/scala/collection/Ranged.scala b/src/library/scala/collection/generic/Ranged.scala
index 7bddb0c688..c0610ad893 100644
--- a/src/library/scala/collection/Ranged.scala
+++ b/src/library/scala/collection/generic/Ranged.scala
@@ -6,16 +6,16 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id$
+// $Id: Ranged.scala 17537 2009-04-20 18:37:37Z odersky $
 
-package scala.collection
+package scala.collection.generic
 
 /** Any collection (including maps) whose keys (or elements) are ordered.
  *
- *  @author Sean McDirmid
+ *  @author martin Odersky
+ *  @version 2.8
  */
-trait Ranged[K, +A] extends Iterable[A] {
-  //protected type SortedSelf <: Ranged[K,A];
+trait Ranged[K, +This <: Ranged[K, This]] {
 
   /** Returns the first key of the collection. */
   def firstKey: K
@@ -36,19 +36,19 @@ trait Ranged[K, +A] extends Iterable[A] {
    *  @param until The upper-bound (exclusive) of the ranged projection.
    *               <code>None</code> if there is no upper bound.
    */
-  def rangeImpl(from: Option[K], until: Option[K]): Ranged[K, A]
+  def rangeImpl(from: Option[K], until: Option[K]): This
 
   /** Creates a ranged projection of this collection with no upper-bound.
    *
    *  @param from The lower-bound (inclusive) of the ranged projection.
    */
-  def from(from: K) = rangeImpl(Some(from), None)
+  def from(from: K): This = rangeImpl(Some(from), None)
 
   /** Creates a ranged projection of this collection with no lower-bound.
    *
    *  @param until The upper-bound (exclusive) of the ranged projection.
    */
-  def until(until: K) = rangeImpl(None, Some(until))
+  def until(until: K): This = rangeImpl(None, Some(until))
 
   /** Creates a ranged projection of this collection with both a lower-bound
    *  and an upper-bound.
@@ -57,5 +57,5 @@ trait Ranged[K, +A] extends Iterable[A] {
    *  @param until ...
    *  @return      ...
    */
-  def range(from: K, until: K) = rangeImpl(Some(from), Some(until))
+  def range(from: K, until: K): This = rangeImpl(Some(from), Some(until))
 }
diff --git a/src/library/scalax/collection/generic/SequenceFactory.scala b/src/library/scala/collection/generic/SequenceFactory.scala
index 26818c49c9..cb2762c4d0 100755
--- a/src/library/scalax/collection/generic/SequenceFactory.scala
+++ b/src/library/scala/collection/generic/SequenceFactory.scala
@@ -1,6 +1,8 @@
-package scalax.collection.generic
+package scala.collection.generic
 
-trait SequenceFactory[CC[A] <: Sequence[A]] extends IterableFactory[CC] {
+/** A template for companion objects of Sequence and subclasses thereof.
+ */
+abstract class SequenceFactory[CC[A] <: Sequence[A]] extends TraversibleFactory[CC] {
 
   /** This method is called in a pattern match { case Sequence(...) => }.
    *
diff --git a/src/library/scalax/collection/generic/SequenceForwarder.scala b/src/library/scala/collection/generic/SequenceForwarder.scala
index 63dca249b6..bf92128d41 100644..100755
--- a/src/library/scalax/collection/generic/SequenceForwarder.scala
+++ b/src/library/scala/collection/generic/SequenceForwarder.scala
@@ -9,14 +9,14 @@
 // $Id: SeqProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
 
 
-package scalax.collection.generic
+package scala.collection.generic
 
 /** This class implements a forwarder for sequences. It forwards
  *  all calls to a different sequence object except for
  *
  *    - toString, hashCode, equals, stringPrefix
  *    - newBuilder, view, toSequence
- *    - all calls creating a new iterable objetc of the same kind
+ *    - all calls creating a new sequence of the same kind
  *
  *  The above methods are forwarded by subclass SequenceProxy
  *
@@ -44,7 +44,7 @@ trait SequenceForwarder[+A] extends Sequence[A] with IterableForwarder[A] {
   override def reversedElements: Iterator[A] = underlying.reversedElements
   override def startsWith[B](that: Sequence[B], offset: Int): Boolean = underlying.startsWith(that, offset)
   override def endsWith[B](that: Sequence[B]): Boolean = underlying.endsWith(that)
-  override def indexOf[B >: A](that: Sequence[B]): Int = underlying.indexOf(that)
+  override def indexOfSeq[B >: A](that: Sequence[B]): Int = underlying.indexOfSeq(that)
   override def contains(elem: Any): Boolean = underlying.contains(elem)
   override def indices: Range = underlying.indices
 }
diff --git a/src/library/scala/collection/generic/SequenceProxyTemplate.scala b/src/library/scala/collection/generic/SequenceProxyTemplate.scala
new file mode 100644
index 0000000000..1854267ad8
--- /dev/null
+++ b/src/library/scala/collection/generic/SequenceProxyTemplate.scala
@@ -0,0 +1,59 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
+
+
+package scala.collection.generic
+
+import collection.mutable.Buffer
+
+// Methods could be printed by  cat SequenceTemplate.scala | egrep '^  (override )?def'
+
+
+/** This trait implements a proxy for iterable objects. It forwards
+ *  all calls to a different iterable object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait SequenceProxyTemplate[+A, +This <: SequenceTemplate[A, This] with Sequence[A]] extends SequenceTemplate[A, This] with IterableProxyTemplate[A, This] {
+  override def length: Int = self.length
+  override def apply(idx: Int): A = self.apply(idx)
+  override def lengthCompare(len: Int): Int = self.lengthCompare(len)
+  override def isDefinedAt(x: Int): Boolean = self.isDefinedAt(x)
+  override def zip[A1 >: A, B, That](that: Sequence[B])(implicit bf: BuilderFactory[(A1, B), That, This]): That = self.zip[A1, B, That](that)(bf)
+  override def zipAll[B, A1 >: A, That](that: Sequence[B], thisElem: A1, thatElem: B)(implicit bf: BuilderFactory[(A1, B), That, This]): That = self.zipAll(that, thisElem, thatElem)(bf)
+  override def zipWithIndex[A1 >: A, That](implicit bf: BuilderFactory[(A1, Int), That, This]): That = self.zipWithIndex(bf)
+  override def segmentLength(p: A => Boolean, from: Int): Int = self.segmentLength(p, from)
+  override def prefixLength(p: A => Boolean) = self.prefixLength(p)
+  override def indexWhere(p: A => Boolean): Int = self.indexWhere(p)
+  override def indexWhere(p: A => Boolean, from: Int): Int = self.indexWhere(p, from)
+  override def indexOf[B >: A](elem: B): Int = self.indexOf(elem)
+  override def indexOf[B >: A](elem: B, from: Int): Int = self.indexOf(elem, from)
+  override def lastIndexOf[B >: A](elem: B): Int = self.lastIndexOf(elem)
+  override def lastIndexOf[B >: A](elem: B, end: Int): Int = self.lastIndexWhere(elem ==, end)
+  override def lastIndexWhere(p: A => Boolean): Int = self.lastIndexWhere(p, length - 1)
+  override def lastIndexWhere(p: A => Boolean, end: Int): Int = self.lastIndexWhere(p)
+  override def reverse: This = self.reverse
+  override def reversedElements: Iterator[A] = self.reversedElements
+  override def startsWith[B](that: Sequence[B], offset: Int): Boolean = self.startsWith(that, offset)
+  override def startsWith[B](that: Sequence[B]): Boolean = self.startsWith(that)
+  override def endsWith[B](that: Sequence[B]): Boolean = self.endsWith(that)
+  override def indexOfSeq[B >: A](that: Sequence[B]): Int = self.indexOfSeq(that)
+  override def contains(elem: Any): Boolean = self.contains(elem)
+  override def union[B >: A, That](that: Sequence[B])(implicit bf: BuilderFactory[B, That, This]): That = self.union(that)(bf)
+  override def diff[B >: A, That](that: Sequence[B]): This = self.diff(that)
+  override def intersect[B >: A, That](that: Sequence[B]): This = self.intersect(that)
+  override def removeDuplicates: This = self.removeDuplicates
+  override def patch[B >: A, That](from: Int, patch: Sequence[B], replaced: Int)(implicit bf: BuilderFactory[B, That, This]): That = self.patch(from, patch, replaced)(bf)
+  override def padTo[B >: A, That](len: Int, elem: B)(implicit bf: BuilderFactory[B, That, This]): That = self.padTo(len, elem)(bf)
+  override def indices: Range = self.indices
+  override def view = self.view
+  override def view(from: Int, until: Int) = self.view(from, until)
+}
diff --git a/src/library/scalax/collection/generic/SequenceTemplate.scala b/src/library/scala/collection/generic/SequenceTemplate.scala
index 3407f63216..b1643a1a62 100755
--- a/src/library/scalax/collection/generic/SequenceTemplate.scala
+++ b/src/library/scala/collection/generic/SequenceTemplate.scala
@@ -9,15 +9,26 @@
 // $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
 
 
-package scalax.collection.generic
+package scala.collection.generic
 
+import mutable.{ListBuffer, HashMap}
+// import immutable.{List, Nil, ::}
+import generic._
 import util.control.Breaks._
-import scalax.collection.immutable.{List, Nil, ::}
 
-import Sequence._
-
-trait SequenceTemplate[+CC[/*+*/B] <: SequenceTemplate[CC, B] with Sequence[B], /*+*/A] extends PartialFunction[Int, A] with OrderedIterableTemplate[CC, A] {
-self /*: CC[A]*/ =>
+/** Class <code>Sequence[A]</code> represents sequences of elements
+ *  of type <code>A</code>.
+ *  It adds the following methods to class Iterable:
+ *   `length`, `lengthCompare`, `apply`, `isDefinedAt`, `segmentLength`, `prefixLengh`,
+ *   `indexWhere`, `indexOf`, `lastIndexWhere`, `lastIndexOf`, `reverse`, `reversedElements`,
+ *   `startsWith`, `endsWith`, `indexOfSeq`, , `zip`, `zipAll`, `zipWithIndex`.
+ *
+ *
+ *  @author  Martin Odersky
+ *  @author  Matthias Zenger
+ *  @version 1.0, 16/07/2003
+ */
+trait SequenceTemplate[+A, +This <: IterableTemplate[A, This] with Sequence[A]] extends IterableTemplate[A, This] { self =>
 
   /** Returns the length of the sequence.
    *
@@ -25,6 +36,10 @@ self /*: CC[A]*/ =>
    */
   def length: Int
 
+  /** Returns the elements at position `idx`
+   */
+  def apply(idx: Int): A
+
   /** Result of comparing <code>length</code> with operand <code>len</code>.
    *  returns <code>x</code> where
    *  <code>x &lt; 0</code>    iff    <code>this.length &lt; len</code>
@@ -47,12 +62,71 @@ self /*: CC[A]*/ =>
   }
 
   /** Should always be <code>length</code> */
-  def size = length
+  override def size = length
 
   /** Is this partial function defined for the index <code>x</code>?
    */
   def isDefinedAt(x: Int): Boolean = (x >= 0) && (x < length)
 
+  /** Returns an iterable formed from this iterable and another iterable
+   *  by combining corresponding elements in pairs.
+   *  If one of the two iterables is longer than the other, its remaining elements are ignored.
+   *  @param   that  The iterable providing the second half of each result pair
+   */
+  def zip[A1 >: A, B, That](that: Sequence[B])(implicit bf: BuilderFactory[(A1, B), That, This]): That = {
+    val b = bf(thisCollection)
+    val these = this.elements
+    val those = that.elements
+    while (these.hasNext && those.hasNext)
+      b += ((these.next, those.next))
+    b.result
+  }
+
+  /** Returns a iterable formed from this iterable and the specified iterable
+   *  <code>that</code> by associating each element of the former with
+   *  the element at the same position in the latter.
+   *
+   *  @param that     iterable <code>that</code> may have a different length
+   *                  as the self iterable.
+   *  @param thisElem element <code>thisElem</code> is used to fill up the
+   *                  resulting iterable if the self iterable is shorter than
+   *                  <code>that</code>
+   *  @param thatElem element <code>thatElem</code> is used to fill up the
+   *                  resulting iterable if <code>that</code> is shorter than
+   *                  the self iterable
+   *  @return         <code>Sequence((a<sub>0</sub>,b<sub>0</sub>), ...,
+   *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
+   *                  ..., {elem,b<sub>m</sub>})</code>
+   *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
+   *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
+   *                  invoked where <code>m &gt; n</code>.
+   *
+   */
+  def zipAll[B, A1 >: A, That](that: Sequence[B], thisElem: A1, thatElem: B)(implicit bf: BuilderFactory[(A1, B), That, This]): That = {
+    val b = bf(thisCollection)
+    val these = this.elements
+    val those = that.elements
+    while (these.hasNext && those.hasNext)
+      b += ((these.next, those.next))
+    while (these.hasNext)
+      b += ((these.next, thatElem))
+    while (those.hasNext)
+      b += ((thisElem, those.next))
+    b.result
+  }
+
+  /** Zips this iterable with its indices (startiong from 0).
+   */
+  def zipWithIndex[A1 >: A, That](implicit bf: BuilderFactory[(A1, Int), That, This]): That = {
+    val b = bf(thisCollection)
+    var i = 0
+    for (x <- this) {
+      b += ((x, i))
+      i +=1
+    }
+    b.result
+  }
+
   /** Returns length of longest segment starting from a start index `from`
    *  such that every element of the segment satisfies predicate `p`.
    *  @note may not terminate for infinite-sized collections.
@@ -61,7 +135,7 @@ self /*: CC[A]*/ =>
    */
   def segmentLength(p: A => Boolean, from: Int): Int = {
     var result = 0
-    var i = from
+    var i = 0
     breakable {
       for (x <- this) {
         if (i >= from && !p(x)) { result = i - from; break }
@@ -138,7 +212,7 @@ self /*: CC[A]*/ =>
    *          specified element, or -1 if the sequence does not contain
    *          this element.
    */
-  def lastIndexOf[B >: A](elem: B): Int = lastIndexOf(elem, length - 1)
+  def lastIndexOf[B >: A](elem: B): Int = lastIndexWhere(elem ==)
 
   /** Returns the index of the last
     *  occurence of the specified element in this sequence
@@ -148,12 +222,7 @@ self /*: CC[A]*/ =>
     *  @param  elem   element to search for.
     *  @param  end    the end index
     */
-  def lastIndexOf[B >: A](elem: B, end: Int): Int = {
-    var i = end
-    val it = reversedElements
-    while (it.hasNext && it.next != elem) i -= 1
-    i
-  }
+  def lastIndexOf[B >: A](elem: B, end: Int): Int = lastIndexWhere(elem ==, end)
 
   /** Returns index of the last element satisying a predicate, or -1, if none exists.
    *
@@ -170,9 +239,9 @@ self /*: CC[A]*/ =>
    *  @param  p the predicate
    */
   def lastIndexWhere(p: A => Boolean, end: Int): Int = {
-    var i = end
+    var i = length - 1
     val it = reversedElements
-    while (it.hasNext && (i > end || !p(it.next))) i -= 1
+    while (it.hasNext && { val elem = it.next; (i > end || !p(elem)) }) i -= 1
     i
   }
 
@@ -183,11 +252,11 @@ self /*: CC[A]*/ =>
    *  If random access is inefficient for the given sequence implementation,
    *  this operation should be overridden.
    */
-  def reverse: CC[A] = {
+  def reverse: This = {
     var xs: List[A] = List()
     for (x <- this)
       xs = x :: xs
-    val b = newBuilder[A]
+    val b = newBuilder
     for (x <- xs)
       b += x
     b.result
@@ -213,7 +282,9 @@ self /*: CC[A]*/ =>
   def startsWith[B](that: Sequence[B], offset: Int): Boolean = {
     val i = elements.drop(offset)
     val j = that.elements
-    while (j.hasNext && i.hasNext && i.next == j.next) {}
+    while (j.hasNext && i.hasNext) {
+      if (i.next != j.next) return false
+    }
     !j.hasNext
   }
 
@@ -222,8 +293,6 @@ self /*: CC[A]*/ =>
    *
    * @return true if <code>that</code> is a prefix of <code>this</code>,
    * otherwise false
-   *
-   * @see Sequence.startsWith
    */
   def startsWith[B](that: Sequence[B]): Boolean = startsWith(that, 0)
 
@@ -241,12 +310,12 @@ self /*: CC[A]*/ =>
    *  index where <code>that</code> is contained
    *  @see String.indexOf
    */
-  def indexOf[B >: A](that: Sequence[B]): Int = {
+  def indexOfSeq[B >: A](that: Sequence[B]): Int = {
     var i = 0
-    var s: Sequence[A] = thisCC
+    var s: Sequence[A] = thisCollection
     while (!s.isEmpty && !(s startsWith that)) {
       i += 1
-      s = s drop 1
+      s = s.tail
     }
     if (!s.isEmpty || that.isEmpty) i else -1
   }
@@ -260,56 +329,120 @@ self /*: CC[A]*/ =>
    */
   def contains(elem: Any): Boolean = exists (_ == elem)
 
-  /** Computes the union of this sequence and the given sequence
-   *  <code>that</code>.
+  /** <p>
+   *    Computes the multiset union of this sequence and the given sequence
+   *    <code>that</code>. For example:
+   *  </p><pre>
+   *    <b>val</b> xs = List(1, 1, 2)
+   *    <b>val</b> ys = List(1, 2, 2, 3)
+   *    println(xs union ys)  // prints "List(1, 1, 2, 1, 2, 2, 3)"
+   *    println(ys union xs)  // prints "List(1, 2, 2, 3, 1, 1, 2)"
+   *  </pre>
    *
    *  @param that the sequence of elements to add to the sequence.
-   *  @return     an sequence containing the elements of this
-   *              sequence and those of the given sequence <code>that</code>
-   *              which are not contained in this sequence.
+   *  @return     a sequence containing the elements of this
+   *              sequence and those of the given sequence <code>that</code>.
    */
-  def union[B >: A](that: Sequence[B]): CC[B] = this ++ (that diff thisCC)
-
-  /** Computes the difference between this sequence and the given sequence
-   *  <code>that</code>.
+  def union[B >: A, That](that: Sequence[B])(implicit bf: BuilderFactory[B, That, This]): That =
+    thisCollection ++ that
+
+  /** <p>
+   *    Computes the multiset difference between this sequence and the
+   *    given sequence <code>that</code>. If an element appears more
+   *    than once in both sequences, the difference contains <i>m</i> copies
+   *    of that element, where <i>m</i> is the difference between the
+   *    number of times the element appears in this sequence and the number
+   *    of times it appears in <code>that</code>. For example:
+   *  </p><pre>
+   *    <b>val</b> xs = List(1, 1, 2)
+   *    <b>val</b> ys = List(1, 2, 2, 3)
+   *    println(xs diff ys)  // prints "List(1)"
+   *    println(xs -- ys)    // prints "List()"
+   *  </pre>
    *
    *  @param that the sequence of elements to remove from this sequence.
-   *  @return     this sequence without the elements of the given sequence
-   *              <code>that</code>.
+   *  @return     the sequence of elements contained only in this sequence plus
+   *              <i>m</i> copies of each element present in both sequences,
+   *              where <i>m</i> is defined as above.
    */
-  def diff[B >: A](that: Sequence[B]): CC[A] = this remove (that contains _)
+  def diff[B >: A, That](that: Sequence[B]): This = {
+    val occ = occCounts(that)
+    val b = newBuilder
+    for (x <- this)
+      if (occ(x) == 0) b += x
+      else occ(x) -= 1
+    b.result
+  }
 
-  /** Computes the intersection between this sequence and the given sequence
-   *  <code>that</code>.
+  /** <p>
+   *    Computes the multiset intersection between this sequence and the
+   *    given sequence <code>that</code>; the intersection contains <i>m</i>
+   *    copies of an element contained in both sequences, where <i>m</i> is
+   *    the smaller of the number of times the element appears in this
+   *    sequence or in <code>that</code>. For example:
+   *  </p><pre>
+   *    <b>val</b> xs = List(1, 1, 2)
+   *    <b>val</b> ys = List(3, 2, 2, 1)
+   *    println(xs intersect ys)  // prints "List(1, 2)"
+   *    println(ys intersect xs)  // prints "List(2, 1)"
+   *  </pre>
    *
    *  @param that the sequence to intersect.
    *  @return     the sequence of elements contained both in this sequence and
    *              in the given sequence <code>that</code>.
    */
-  def intersect[B >: A](that: Sequence[B]): CC[A] = this filter(that contains _)
+  def intersect[B >: A, That](that: Sequence[B]): This = {
+    val occ = occCounts(that)
+    val b = newBuilder
+    for (x <- this)
+      if (occ(x) > 0) {
+        b += x
+        occ(x) -= 1
+      }
+    b.result
+  }
+
+  private def occCounts[B](seq: Sequence[B]): HashMap[B, Int] = {
+    val occ = new HashMap[B, Int] { override def default(k: B) = 0 }
+    for (y <- seq) occ(y) += 1
+    occ
+  }
 
   /** Builds a new sequence from this sequence in which any duplicates (wrt to ==) removed.
    *  Among duplicate elements, only the first one is retained in the result sequence
    */
-  def removeDuplicates: CC[A] = {
-    val b = newBuilder[A]
+  def removeDuplicates: This = {
+    val b = newBuilder
     var seen = Set[A]()
     for (x <- this) {
       if (!(seen contains x)) {
         b += x
-        seen += x
+        seen = (seen + x)
       }
     }
     b.result
   }
 
+  /** A new sequence, consisting of all elements of current sequence
+   *  except that `replaced` elements starting from `from` are replaced
+   *  by `patch`.
+   */
+  def patch[B >: A, That](from: Int, patch: Sequence[B], replaced: Int)(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    val (prefix, rest) = this.splitAt(from)
+    b ++= prefix
+    b ++= patch
+    b ++= rest drop replaced
+    b.result
+  }
+
   /** Returns a new sequence of given length containing the elements of this sequence followed by zero
    *  or more occurrences of given elements.
    */
-  def padTo[B >: A](len: Int, elem: B): CC[B] = {
+  def padTo[B >: A, That](len: Int, elem: B)(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
     var diff = len - length
-    val b = newBuilder[B] //!!! drop [B] and get surprising results!
-    b ++= thisCC
+    b ++= thisCollection
     while (diff > 0) {
       b += elem
       diff -=1
@@ -322,33 +455,32 @@ self /*: CC[A]*/ =>
    *
    *  @return  the sequence itself
    */
-  override def toSequence: Sequence[A] = thisCC
-
-  /** Force toString from Iterable, not from Function */
-  override def toString = super[OrderedIterableTemplate].toString
+  override def toSequence: Sequence[A] = thisCollection
 
   def indices: Range = 0 until length
 
-  /** Creates a view of this iterable @see OrderedIterable.View
-   */
-  override def view: SequenceView[CC, A] = new SequenceView[CC, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin: Sequence[_] = thisCC
-    val elements: Iterator[A] = self.elements
-    val length: Int = self.length
-    def apply(idx: Int): A = self.apply(idx)
+  override def view = new SequenceView[A, This] {
+    protected lazy val underlying = self.thisCollection
+    override def elements = self.elements
+    override def length = self.length
+    override def apply(idx: Int) = self.apply(idx)
   }
 
-  /** A sub-sequence view  starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until  The index of the element following the slice
-   *  @note  The difference between `view` and `slice` is that `view` produces
-   *         a view of the current sequence, whereas `slice` produces a new sequence.
-   *
-   *  @note view(from, to)  is equivalent to view.slice(from, to)
+  override def view(from: Int, until: Int) = view.slice(from, until)
+
+  override def equals(that: Any): Boolean = that match {
+    case that1: Sequence[a] =>
+      val these = this.elements
+      val those = that1.elements
+      while (these.hasNext && those.hasNext && these.next() == those.next()) {}
+      !these.hasNext && !those.hasNext
+    case _ =>
+      false
+  }
+
+  /** Need to override string, so that it's not the Function1's string that gets mixed in.
    */
-  override def view(from: Int, until: Int): SequenceView[CC, A] = view.slice(from, until)
+  override def toString = super[IterableTemplate].toString
 
   /** Returns index of the last element satisying a predicate, or -1.
    *  @deprecated use `lastIndexWhere` instead
@@ -380,4 +512,12 @@ self /*: CC[A]*/ =>
    */
   @deprecated def containsSlice[B](that: Sequence[B]): Boolean = indexOf(that) != -1
 
+ /**
+   * returns a projection that can be used to call non-strict <code>filter</code>,
+   * <code>map</code>, and <code>flatMap</code> methods that build projections
+   * of the collection.
+   * @deprecated use view instead
+   */
+  @deprecated override def projection = view
 }
+
diff --git a/src/library/scala/collection/generic/SequenceView.scala b/src/library/scala/collection/generic/SequenceView.scala
new file mode 100755
index 0000000000..56b15ac7dc
--- /dev/null
+++ b/src/library/scala/collection/generic/SequenceView.scala
@@ -0,0 +1,28 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import Sequence.fill
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait SequenceView[+A, +Coll <: Sequence[_]] extends SequenceViewTemplate[A, Coll, SequenceView[A, Coll]]
+
+object SequenceView {
+  type Coll = TraversibleView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, SequenceView[A, Sequence[_]], Coll] = new BuilderFactory[A, SequenceView[A, Sequence[_]], Coll] { def apply(from: Coll) = new NoBuilder }
+}
+
diff --git a/src/library/scala/collection/generic/SequenceViewTemplate.scala b/src/library/scala/collection/generic/SequenceViewTemplate.scala
new file mode 100755
index 0000000000..39283763ea
--- /dev/null
+++ b/src/library/scala/collection/generic/SequenceViewTemplate.scala
@@ -0,0 +1,175 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import Sequence.fill
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait SequenceViewTemplate[+A,
+                           +Coll <: Sequence[_],
+                           +This <: SequenceView[A, Coll] with SequenceViewTemplate[A, Coll, This]]
+  extends Sequence[A] with SequenceTemplate[A, This] with IterableView[A, Coll] with IterableViewTemplate[A, Coll, This]
+{ self =>
+
+  trait Transformed[+B] extends SequenceView[B, Coll] with super.Transformed[B] {
+    override def length: Int
+    override def apply(idx: Int): B
+  }
+
+  trait Sliced extends Transformed[A] with super.Sliced {
+    override def length = ((until min self.length) - from) max 0
+    override def apply(idx: Int): A =
+      if (idx + from < until) self.apply(idx + from)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait Mapped[B] extends Transformed[B] with super.Mapped[B] {
+    override def length = self.length
+    override def apply(idx: Int): B = mapping(self apply idx)
+  }
+
+  trait FlatMapped[B] extends Transformed[B] with super.FlatMapped[B] {
+    protected[this] lazy val index = {
+      val index = new Array[Int](self.length + 1)
+      index(0) = 0
+      for (i <- 0 until self.length)
+        index(i + 1) = index(i) + mapping(self(i)).size
+      index
+    }
+    protected[this] def findRow(idx: Int, lo: Int, hi: Int): Int = {
+      val mid = (lo + hi) / 2
+      if (idx < index(mid)) findRow(idx, lo, mid - 1)
+      else if (idx >= index(mid + 1)) findRow(idx, mid + 1, hi)
+      else mid
+    }
+    override def length = index(self.length)
+    override def apply(idx: Int) = {
+      val row = findRow(idx, 0, self.length - 1)
+      mapping(self(row)).toSequence(idx - index(row))
+    }
+  }
+
+  trait Appended[B >: A] extends Transformed[B] with super.Appended[B] {
+    lazy val restSeq = rest.toSequence
+    override def length = self.length + restSeq.length
+    override def apply(idx: Int) =
+      if (idx < self.length) self(idx) else restSeq(idx - self.length)
+  }
+
+  trait Filtered extends Transformed[A] with super.Filtered {
+    protected[this] lazy val index = {
+      var len = 0
+      val arr = new Array[Int](self.length)
+      for (i <- 0 until self.length)
+        if (pred(self(i))) {
+          arr(len) = i
+          len += 1
+        }
+      arr take len
+    }
+    override def length = index.length
+    override def apply(idx: Int) = self(index(idx))
+  }
+
+  trait TakenWhile extends Transformed[A] with super.TakenWhile {
+    protected[this] lazy val len = self prefixLength pred
+    override def length = len
+    override def apply(idx: Int) =
+      if (idx < len) self(idx)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait DroppedWhile extends Transformed[A] with super.DroppedWhile {
+    protected[this] lazy val start = self prefixLength pred
+    override def length = self.length - start
+    override def apply(idx: Int) =
+      if (idx >= 0) self(idx + start)
+      else throw new IndexOutOfBoundsException(idx.toString)
+  }
+
+  trait Reversed extends Transformed[A] {
+    override def elements: Iterator[A] = self.reversedElements
+    override def length: Int = self.length
+    override def apply(idx: Int): A = self.apply(length - 1 - idx)
+    override def stringPrefix = super.stringPrefix+"R"
+  }
+
+  trait Patched[B >: A] extends Transformed[B] {
+    protected[this] val from: Int
+    protected[this] val patch: Sequence[B]
+    protected[this] val replaced: Int
+    private val plen = patch.length
+    override def elements: Iterator[B] = self.elements patch (from, patch.elements, replaced)
+    override def length: Int = self.length + plen - replaced
+    override def apply(idx: Int): B =
+      if (idx < from) self.apply(idx)
+      else if (idx < from + plen) patch.apply(idx - from)
+      else self.apply(idx - plen + replaced)
+    override def stringPrefix = super.stringPrefix+"P"
+  }
+
+  trait Zipped[B] extends Transformed[(A, B)] {
+    protected[this] val other: Sequence[B]
+    override def elements: Iterator[(A, B)] = self.elements zip other.elements
+    override def length = self.length min other.length
+    override def apply(idx: Int): (A, B) = (self.apply(idx), other.apply(idx))
+    override def stringPrefix = super.stringPrefix+"Z"
+  }
+
+  /** Boilerplate method, to override in each subclass
+   *  This method could be eliminated if Scala had virtual classes
+   */
+  protected override def newAppended[B >: A](that: Traversible[B]): Transformed[B] = new Appended[B] { val rest = that }
+  protected override def newMapped[B](f: A => B): Transformed[B] = new Mapped[B] { val mapping = f }
+  protected override def newFlatMapped[B](f: A => Traversible[B]): Transformed[B] = new FlatMapped[B] { val mapping = f }
+  protected override def newFiltered(p: A => Boolean): Transformed[A] = new Filtered { val pred = p }
+  protected override def newSliced(_from: Int, _until: Int): Transformed[A] = new Sliced { val from = _from; val until = _until }
+  protected override def newDroppedWhile(p: A => Boolean): Transformed[A] = new DroppedWhile { val pred = p }
+  protected override def newTakenWhile(p: A => Boolean): Transformed[A] = new TakenWhile { val pred = p }
+  protected def newReversed: Transformed[A] = new Reversed { }
+  protected def newPatched[B >: A](_from: Int, _patch: Sequence[B], _replaced: Int): Transformed[B] = new Patched[B] {
+    val from = _from; val patch = _patch; val replaced = _replaced
+  }
+  protected def newZipped[B](that: Sequence[B]): Transformed[(A, B)] = new Zipped[B] {
+    val other = that
+  }
+
+  override def reverse: This = newReversed.asInstanceOf[This]
+
+  override def patch[B >: A, That](from: Int, patch: Sequence[B], replaced: Int)(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    if (b.isInstanceOf[NoBuilder[_]]) newPatched(from, patch, replaced).asInstanceOf[That]
+    else super.patch[B, That](from, patch, replaced)(bf)
+  }
+
+  override def padTo[B >: A, That](len: Int, elem: B)(implicit bf: BuilderFactory[B, That, This]): That =
+    patch(length, fill(len - length)(elem), 0)
+
+  override def zip[A1 >: A, B, That](that: Sequence[B])(implicit bf: BuilderFactory[(A1, B), That, This]): That = {
+    val b = bf(thisCollection)
+    if (b.isInstanceOf[NoBuilder[_]]) newZipped(that).asInstanceOf[That]
+    else super.zip[A1, B, That](that)(bf)
+  }
+
+  override def zipWithIndex[A1 >: A, That](implicit bf: BuilderFactory[(A1, Int), That, This]): That =
+    zip[A1, Int, That](Sequence.range(0, length))(bf)
+
+  override def zipAll[B, A1 >: A, That](that: Sequence[B], thisElem: A1, thatElem: B)(implicit bf: BuilderFactory[(A1, B), That, This]): That =
+    self.padTo(that.length, thisElem).zip(that.padTo(this.length, thatElem))(bf.asInstanceOf[BuilderFactory[(A1, B), That, Any]])
+}
+
+
diff --git a/src/library/scalax/collection/generic/AddableBuilder.scala b/src/library/scala/collection/generic/SetBuilder.scala
index b1f3e4e522..ab8f1bee73 100644
--- a/src/library/scalax/collection/generic/AddableBuilder.scala
+++ b/src/library/scala/collection/generic/SetBuilder.scala
@@ -8,15 +8,19 @@
 
 // $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
 
-package scalax.collection.generic
+package scala.collection.generic
 
-import collection.mutable.ListBuffer
-import collection.immutable.{List, Nil, ::}
+// import collection.immutable.{List, Nil, ::}
 
-class AddableBuilder[CC[B] <: Iterable[B] with Addable[CC[B], B], A](empty: CC[A]) extends Builder[CC, A] {
-  protected var elems: CC[A] = empty
+/** The canonical builder for collections that are addable, i.e. that support an efficient + method
+ *  which adds an element to the collection.
+ *  Collections are built from their empty element using this + method.
+ *  @param empty   The empty element of the collection.
+ */
+class SetBuilder[A, Coll <: Addable[A, Coll] with Iterable[A] with IterableTemplate[A, Coll]](empty: Coll)
+extends Builder[A, Coll, Any] {
+  protected var elems: Coll = empty
   def +=(x: A) { elems = elems + x }
-  def elements: Iterator[A] = elems.elements
   def clear() { elems = empty }
-  def result: CC[A] = elems
+  def result: Coll = elems
 }
diff --git a/src/library/scala/collection/generic/SetFactory.scala b/src/library/scala/collection/generic/SetFactory.scala
new file mode 100755
index 0000000000..a2caa99432
--- /dev/null
+++ b/src/library/scala/collection/generic/SetFactory.scala
@@ -0,0 +1,16 @@
+package scala.collection.generic
+
+/** A template for companion objects of Map and subclasses thereof.
+ */
+abstract class SetFactory[CC[A] <: Set[A] with SetTemplate[A, CC[A]]] {
+
+  def newBuilder[A]: Builder[A, CC[A], Any] = new AddingBuilder[A, CC[A]](empty[A])
+
+  def empty[A]: CC[A]
+
+  def apply[A](elems: A*): CC[A] = {
+    var s = empty[A]
+    for (elem <- elems) s = s + elem
+    s
+  }
+}
diff --git a/src/library/scalax/collection/generic/SetTemplate.scala b/src/library/scala/collection/generic/SetTemplate.scala
index bd94f10fc0..865d4a333b 100755
--- a/src/library/scalax/collection/generic/SetTemplate.scala
+++ b/src/library/scala/collection/generic/SetTemplate.scala
@@ -6,46 +6,31 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id: Set.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.generic
-
-
-/** <p>
- *    A set is a collection that includes at most one of any object.
- *  </p>
- *  <p>
- *    This trait provides a limited interface, only allowing reading of elements.
- *    There are two extensions of this trait, in packages
- *    <code><a href="mutable$content.html" target="contentFrame">
- *    scala.collection.mutable</a></code>
- *    and <code><a href="immutable$content.html" target="contentFrame">
- *    scala.collection.immutable</a></code>, which provide functionality for
- *    adding and removing objects from the set. The trait in the first package is
- *    for sets that are modified destructively, whereas the trait in
- *    the second package is for immutable sets which create a new set
- *    when something is added or removed to them.
+// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
+
+package scala.collection.generic
+
+/** A generic template for sets of type A.
+ *  To implement a concrete set, you need to provide implementations of the following methods:
+ *  (where This is the type of the set in question):
+ *
+ *   def contains(key: A): Boolean
+ *   def elements: Iterator[A]
+ *   def +(elem: A): This
+ *   def -(elem: A): This
  *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
+ * If you wish that methods like, take, drop, filter return the same kind of set, you should also
+ * override:
+ *
+ *   def empty: This
+ *
+ * It is also good idea to override methods foreach and size for efficiency.
  */
-trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
-  extends (A => Boolean)
-     with SizedIterable[A]
-     with IterableTemplate[CC, A]
-     with Addable[CC[A], A]
-     with Subtractable[CC[A], A] {
-
-  /** Returns the number of elements in this set.
-   *
-   *  @return number of set elements.
-   */
-  def size: Int
+trait SetTemplate[A, +This <: SetTemplate[A, This] with Set[A]] extends IterableTemplate[A, This] with Addable[A, This] with Subtractable[A, This] { self =>
+
+  def empty: This
 
-  /** Creates a new set of this kind with given elements */
-  def newBuilder[B]: Builder[CC, B]
+  override protected[this] def newBuilder: Builder[A, This, Any] = new AddingBuilder[A, This](empty)
 
   /** Checks if this set contains element <code>elem</code>.
    *
@@ -55,15 +40,15 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    */
   def contains(elem: A): Boolean
 
-  /** Create a new set with an additional element.
+  /** Creates a new set with an additional element, unless the element is already present.
+   *  @param elem the element to be added
    */
-  def + (elem: A): CC[A]
+  def + (elem: A): This
 
-  /** Remove a single element from a set.
+  /** Removes a single element from a set, unless the element is not present.
    *  @param elem the element to be removed
-   *  @return a new set with the element removed.
    */
-  def - (elem: A): CC[A]
+  def - (elem: A): This
 
   /** Checks if this set is empty.
    *
@@ -86,7 +71,16 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    *
    *  @param that the set to intersect with.
    */
-  def intersect(that: Set[A]): CC[A] = filter(that.contains)
+  def intersect(that: Set[A]): This = filter(that.contains)
+
+ /** This method is an alias for <code>intersect</code>.
+   *  It computes an intersection with set <code>that</code>.
+   *  It removes all the elements that are not present in <code>that</code>.
+   *
+   *  @param that the set to intersect with
+   *  @deprecated use & instead
+   */
+  @deprecated def ** (that: Set[A]): This = intersect(that)
 
   /** This method is an alias for <code>intersect</code>.
    *  It computes an intersection with set <code>that</code>.
@@ -94,7 +88,20 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    *
    *  @param that the set to intersect with
    */
-  def ** (that: collection.Set[A]): CC[A] = intersect(that)
+  def & (that: collection.Set[A]): This = intersect(that)
+
+   /** Computes the union of this set and the given set <code>that</code>.
+   *
+   *  @param that the sequence of elements to add to the sequence.
+   *  @return     a set containing the elements of this
+   *              set and those of the given set <code>that</code>.
+   */
+  def union(that: Set[A]): This = (thisCollection /: that) (_ + _)
+
+  /** This method is an alias for <code>union</code>.
+   *  It computes the union of this set and the given set <code>that</code>.
+   */
+  def | (that: Set[A]): This = union(that)
 
   /** Checks if this set is a subset of set <code>that</code>.
    *
@@ -105,9 +112,6 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    */
   def subsetOf(that: Set[A]): Boolean = forall(that.contains)
 
-/* What a mess! We need to remove these methods, but can't without breaking
- * existing code. What to do?
-
   /** Compares this set with another object and returns true, iff the
    *  other object is also a set which contains the same elements as
    *  this set.
@@ -116,28 +120,20 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    *  @note not necessarily run-time type safe.
    *  @return     <code>true</code> iff this set and the other set
    *              contain the same elements.
-   *  @deprecated equals is not stable for mutable sets.
-   *              If you wish object identity, use eq or cast this set of AnyRef and then use
-   *              equals. If you wish element comparisons, use `sameElements` instead.
    */
-  @deprecated override def equals(that: Any): Boolean = that match {
+  override def equals(that: Any): Boolean = that match {
     case other: Set[_] =>
-      this.size == other.size && subsetOf(other.asInstanceOf[Set[A]])
+      if (this.size == other.size)
+        try { // can we find a safer way to do this?
+          subsetOf(other.asInstanceOf[Set[A]])
+        } catch {
+          case ex: ClassCastException => false
+        }
+      else false
     case _ =>
       false
   }
 
-  /*  @deprecated Since the previous hashCode is not stable for mutable sets,
-   *              the implementation of this method has been changed to
-   *              standard address-based hashCode from java.lang.Object.
-   *              If you relied on the old behavior, y
-   *              IT has been
-   *  if you intend to have object identity hashCode and wish the deprecated warning
-   *              to go away, cast this set to AnyRef before calling hashCode.
-   */
-  @deprecated override def hashCode() =
-    (0 /: this)((hash, e) => hash + e.hashCode())
-*/
   /** Defines the prefix of this object's <code>toString</code> representation.
    */
   override def stringPrefix: String = "Set"
@@ -146,3 +142,6 @@ trait SetTemplate[+CC[B] <: SetTemplate[CC, B] with Set[B], A]
    */
   override def toString = super[IterableTemplate].toString
 }
+
+
+
diff --git a/src/library/scalax/collection/generic/Shrinkable.scala b/src/library/scala/collection/generic/Shrinkable.scala
index e6d3b085f3..1c4987b90b 100755
--- a/src/library/scalax/collection/generic/Shrinkable.scala
+++ b/src/library/scala/collection/generic/Shrinkable.scala
@@ -8,7 +8,7 @@
 
 // $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
 
-package scalax.collection.generic
+package scala.collection.generic
 
 /** This class represents collections that can be reduced using a -= operator.
  *
@@ -16,7 +16,7 @@ package scalax.collection.generic
  *  @owner   Martin Odersky
  *  @version 2.8
  */
-trait Shrinkable[A] {
+trait Shrinkable[-A] {
 
   /** Removes a single element from this collection.
    *
@@ -33,20 +33,20 @@ trait Shrinkable[A] {
   def -=(elem1: A, elem2: A, elems: A*) {
     this -= elem1
     this -= elem2
-    this --= elems.asInstanceOf[Iterable[A]] // !@!
+    this --= Iterable.fromOld(elems)
   }
 
   /** Removes a number of elements provided by an iterator from this collection.
    *
    *  @param iter  the iterator.
    */
-  def --=(iter: collection.Iterator[A]) { iter foreach -= }
+  def --=(iter: Iterator[A]) { iter foreach -= }
 
   /** Removes a number of elements provided by an iterable object from this collection.
    *
    *  @param iter  the iterable object.
    */
-  def --=(iter: collection.Iterable[A]) { iter foreach -= }
+  def --=(iter: Traversible[A]) { iter foreach -= }
 }
 
 
diff --git a/src/library/scala/collection/Sorted.scala b/src/library/scala/collection/generic/Sorted.scala
index fcd2a64463..007629811f 100644
--- a/src/library/scala/collection/Sorted.scala
+++ b/src/library/scala/collection/generic/Sorted.scala
@@ -6,48 +6,34 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id$
+// $Id: Sorted.scala 17537 2009-04-20 18:37:37Z odersky $
 
-package scala.collection
+package scala.collection.generic
 
 /** Any collection (including maps) whose keys (or elements) are ordered.
  *
  *  @author Sean McDirmid
  */
-trait Sorted[K,+A] extends Ranged[K,A] {
+trait Sorted[K, +This <: Sorted[K, This]] extends Ranged[K, This] {
+
+  /** The current collection */
+  protected def thisCollection: This
 
   /** return as a projection the set of keys in this collection */
   def keySet: SortedSet[K]
 
-  /** Creates a ranged projection of this collection. Any mutations in the
-   *  ranged projection will update this collection and vice versa.  Keys
-   *  are garuanteed to be consistent between the collection and its projection.
-   *
-   *  @param from  The lower-bound (inclusive) of the ranged projection.
-   *               <code>None</code> if there is no lower bound.
-   *  @param until The upper-bound (exclusive) of the ranged projection.
-   *               <code>None</code> if there is no upper bound.
-   */
-  override def rangeImpl(from: Option[K], until: Option[K]): Sorted[K,A]
-
-  override def from(from: K) = rangeImpl(Some(from), None)
-
-  override def until(until: K) = rangeImpl(None, Some(until))
-
-  override def range(from: K, until: K) = rangeImpl(Some(from),Some(until))
-
   /** Create a range projection of this collection with no lower-bound.
    *  @param to The upper-bound (inclusive) of the ranged projection.
    */
-  def to(to: K): Sorted[K,A] = {
+  def to(to: K): This = {
     // tough!
     val i = keySet.from(to).elements;
-    if (!i.hasNext) return this;
+    if (!i.hasNext) return thisCollection
     val next = i.next;
     if (next == to) {
-      if (!i.hasNext) return this;
-      else return until(i.next);
-    } else return until(next);
+      if (!i.hasNext) return thisCollection
+      else return until(i.next)
+    } else return until(next)
   }
 
   protected def hasAll(j: Iterator[K]): Boolean = {
diff --git a/src/library/scala/collection/generic/SortedMapTemplate.scala b/src/library/scala/collection/generic/SortedMapTemplate.scala
new file mode 100755
index 0000000000..8c7e4eb54f
--- /dev/null
+++ b/src/library/scala/collection/generic/SortedMapTemplate.scala
@@ -0,0 +1,69 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: SortedMap.scala 16893 2009-01-13 13:09:22Z cunei $
+package scala.collection.generic
+
+/** A template for maps whose keys are sorted.
+ *  To create a concrete sorted map, you need to implement the rangeImpl method,
+ *  in addition to those of `MapTemplate`.
+ *
+ *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait SortedMapTemplate[A, +B, +This <: SortedMapTemplate[A, B, This] with SortedMap[A, B]] extends Sorted[A, This] with MapTemplate[A, B, This] {
+self =>
+
+  def firstKey : A = head._1
+  def lastKey : A = last._1
+
+  // XXX: implement default version
+  def rangeImpl(from : Option[A], until : Option[A]) : This
+
+  protected class DefaultKeySet extends super.DefaultKeySet with SortedSet[A] {
+    def compare(k0: A, k1: A) = self.thisCollection.compare(k0, k1)
+    /** We can't give an implementation of +/- here because we do not have a generic sorted set implementation
+     */
+    override def + (elem: A): SortedSet[A] = throw new UnsupportedOperationException("keySet.+")
+    override def - (elem: A): SortedSet[A] = throw new UnsupportedOperationException("keySet.-")
+    override def rangeImpl(from : Option[A], until : Option[A]) : SortedSet[A] = {
+      val map = self.rangeImpl(from, until)
+      new map.DefaultKeySet
+    }
+  }
+
+  override def keySet : SortedSet[A] = new DefaultKeySet
+
+  /** Add a key/value pair to this map.
+   *  @param    key the key
+   *  @param    value the value
+   *  @return   A new map with the new binding added to this map
+   */
+  def add [B1 >: B](key: A, value: B1): SortedMap[A, B1]
+
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
+   */
+  override def + [B1 >: B] (kv: (A, B1)): SortedMap[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): SortedMap[A, B1] = {
+    var m = this + elem1 + elem2;
+    for (e <- elems) m = m + e
+    m
+  }
+}
diff --git a/src/library/scala/collection/generic/SortedSetTemplate.scala b/src/library/scala/collection/generic/SortedSetTemplate.scala
new file mode 100755
index 0000000000..4d02e93ba0
--- /dev/null
+++ b/src/library/scala/collection/generic/SortedSetTemplate.scala
@@ -0,0 +1,38 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: SortedSet.scala 16893 2009-01-13 13:09:22Z cunei $
+// !!! todo: integrate in new collections library
+
+package scala.collection.generic
+
+/** A template for sets which are sorted.
+ *
+ *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait SortedSetTemplate[A, +This <: SortedSet[A] with SortedSetTemplate[A, This]] extends Sorted[A, This] with SetTemplate[A, This] {
+self =>
+
+  override def keySet = thisCollection
+
+  override def firstKey: A = head
+  override def lastKey: A = last
+
+  def rangeImpl(from: Option[A], until: Option[A]): This
+
+  override def from(from: A): This = rangeImpl(Some(from), None)
+  override def until(until: A): This = rangeImpl(None, Some(until))
+  override def range(from: A, until: A): This = rangeImpl(Some(from), Some(until))
+
+  override def subsetOf(that: Set[A]): Boolean = that match {
+    case that: SortedSet[_] => that.hasAll(elements)
+    case that => super.subsetOf(that)
+  }
+}
diff --git a/src/library/scalax/collection/generic/Subtractable.scala b/src/library/scala/collection/generic/Subtractable.scala
index 93fe2f8190..498b2faf5c 100755
--- a/src/library/scalax/collection/generic/Subtractable.scala
+++ b/src/library/scala/collection/generic/Subtractable.scala
@@ -8,7 +8,7 @@
 
 // $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
 
-package scalax.collection.generic
+package scala.collection.generic
 
 /** This class represents collections that can be reduced using a -= operator.
  *
@@ -16,9 +16,9 @@ package scalax.collection.generic
  *  @owner   Martin Odersky
  *  @version 2.8
  */
-trait Subtractable[+C <: Subtractable[C, A], A] {
+trait Subtractable[A, +This <: Subtractable[A, This]] { self =>
 
-  protected def thisCC: C
+  protected def thisCollection: This
 
   /** Removes a single element from this collection and returns
    *  either the collection itself (if it is mutable), or a new collection
@@ -26,7 +26,7 @@ trait Subtractable[+C <: Subtractable[C, A], A] {
    *
    *  @param elem  the element to remove.
    */
-  def -(elem: A): C
+  def -(elem: A): This
 
   /** Removes two or more elements from this collection and returns
    *  either the collection itself (if it is mutable), or a new collection
@@ -36,8 +36,8 @@ trait Subtractable[+C <: Subtractable[C, A], A] {
    *  @param elem2 the second element to remove.
    *  @param elems the remaining elements to remove.
    */
-  def -(elem1: A, elem2: A, elems: A*): C =
-    thisCC - elem1 - elem2 -- elems.asInstanceOf[Iterable[A]] // !@!
+  def -(elem1: A, elem2: A, elems: A*): This =
+    this - elem1 - elem2 -- Iterable.fromOld(elems)
 
   /** Removes a number of elements provided by an iterable object
    *  via its <code>elements</code> method and returns
@@ -46,7 +46,7 @@ trait Subtractable[+C <: Subtractable[C, A], A] {
    *
    *  @param iter     the iterable object.
    */
-  def --(iter: Iterable[A]): C = (thisCC /: iter) (_ - _)
+  def --(iter: Traversible[A]): This = (thisCollection /: iter) (_ - _)
 
   /** Removes a number of elements provided by an iterator
    *  via its <code>elements</code> method and returns
@@ -55,7 +55,7 @@ trait Subtractable[+C <: Subtractable[C, A], A] {
    *
    *  @param iter   the iterator
    */
-  def --(iter: Iterator[A]): C = (thisCC /: iter) (_ - _)
+  def --(iter: Iterator[A]): This = (thisCollection /: iter) (_ - _)
 
 }
 
diff --git a/src/library/scala/collection/generic/TraversibleFactory.scala b/src/library/scala/collection/generic/TraversibleFactory.scala
new file mode 100755
index 0000000000..7d054c1b81
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleFactory.scala
@@ -0,0 +1,183 @@
+ package scala.collection.generic
+
+/** A template for companion objects of Traversible and subclasses thereof.
+ */
+abstract class TraversibleFactory[CC[A] <: Traversible[A]] {
+
+  /** The builder for this kind of collection.
+   */
+  def newBuilder[A]: Builder[A, CC[A], Any]
+
+ /** The empty iterable of type CC */
+  def empty[A]:  CC[A] = newBuilder[A].result
+
+  /** Creates an iterable of type CC with specified elements */
+  def apply[A](args: A*): CC[A] = {
+    val b = newBuilder[A]
+    b ++= Iterable.fromOld(args)
+    b.result
+  }
+
+  /** Concatenate all the argument collections into a single collection.
+   *
+   *  @param xss the collections that are to be concatenated
+   *  @return the concatenation of all the collections
+   */
+  def concat[A](xss: Traversible[A]*): CC[A] = {
+    val b = newBuilder[A]
+    for (xs <- xss) b ++= xs
+    b.result
+  }
+
+  /** An iterable that contains the results of some element computation a number of times.
+   *  @param   n  the number of elements returned
+   *  @param   elem the element computation
+   */
+  def fill[A](n: Int)(elem: => A): CC[A] = {
+    val b = newBuilder[A]
+    var i = 0
+    while (i < n) {
+      b += elem
+      i += 1
+    }
+    b.result
+  }
+
+  /** A two-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int)(elem: => A): CC[CC[A]] =
+    tabulate(n1)(_ => fill(n2)(elem))
+
+  /** A three-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): CC[CC[CC[A]]] =
+    tabulate(n1)(_ => fill(n2, n3)(elem))
+
+  /** A four-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): CC[CC[CC[CC[A]]]] =
+    tabulate(n1)(_ => fill(n2, n3, n4)(elem))
+
+  /** A five-dimensional iterable that contains the results of some element computation a number of times.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   n5  the number of elements in the 5th dimension
+   *  @param   elem the element computation
+   */
+  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): CC[CC[CC[CC[CC[A]]]]] =
+    tabulate(n1)(_ => fill(n2, n3, n4, n5)(elem))
+
+  /** An iterable containing values of a given function over a range of integer values starting from 0.
+   *  @param  n   The number of elements in the iterable
+   *  @param  f   The function computing element values
+   *  @return An iterable consisting of elements `f(0), ..., f(n -1)`
+   */
+  def tabulate[A](n: Int)(f: Int => A): CC[A] = {
+    val b = newBuilder[A]
+    var i = 0
+    while (i < n) {
+      b += f(i)
+      i += 1
+    }
+    b.result
+  }
+
+  /** A two-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   f   The function computing element values
+   */
+  def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): CC[CC[A]] =
+    tabulate(n1)(i1 => tabulate(n2)(f(i1, _)))
+
+  /** A three-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   f   The function computing element values
+   */
+  def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): CC[CC[CC[A]]] =
+    tabulate(n1)(i1 => tabulate(n2, n3)(f(i1, _, _)))
+
+  /** A four-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   f   The function computing element values
+   */
+  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): CC[CC[CC[CC[A]]]] =
+    tabulate(n1)(i1 => tabulate(n2, n3, n4)(f(i1, _, _, _)))
+
+  /** A five-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
+   *  @param   n1  the number of elements in the 1st dimension
+   *  @param   n2  the number of elements in the 2nd dimension
+   *  @param   n3  the number of elements in the 3nd dimension
+   *  @param   n4  the number of elements in the 4th dimension
+   *  @param   n5  the number of elements in the 5th dimension
+   *  @param   f   The function computing element values
+   */
+  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): CC[CC[CC[CC[CC[A]]]]] =
+    tabulate(n1)(i1 => tabulate(n2, n3, n4, n5)(f(i1, _, _, _, _)))
+
+  /** An iterable containing a sequence of increasing integers in a range.
+   *
+   *  @param from the start value of the iterable
+   *  @param end the end value of the iterable (the first value NOT returned)
+   *  @return  the iterable with values in range `start, start + 1, ..., end - 1`
+   *  up to, but exclusding, `end`.
+   */
+  def range[A](start: Int, end: Int): CC[Int] = range(start, end, 1)
+
+  /** An iterable containing equally spaced values in some integer interval.
+
+   *  @param start the start value of the iterable
+   *  @param end   the end value of the iterable (the first value NOT returned)
+   *  @param step  the increment value of the iterable (must be positive or negative)
+   *  @return      the iterable with values in `start, start + step, ...` up to, but excluding `end`
+   */
+  def range(start: Int, end: Int, step: Int): CC[Int] = {
+    if (step == 0) throw new IllegalArgumentException("zero step")
+    val b = newBuilder[Int]
+    var i = start
+    while (if (step < 0) end < i else i < end) {
+      b += i
+      i += step
+    }
+    b.result
+  }
+
+  /** An iterable containing repeated applications of a function to a start value.
+   *
+   *  @param start the start value of the iterable
+   *  @param len   the number of elements returned by the iterable
+   *  @param f     the function that's repeatedly applied
+   *  @return      the iterable returning `len` values in the sequence `start, f(start), f(f(start)), ...`
+   */
+  def iterate(start: Int, len: Int)(f: Int => Int): CC[Int] = {
+    val b = newBuilder[Int]
+    var acc = start
+    var i = 0
+    while (i < len) {
+      b += acc
+      acc = f(acc)
+      i += 1
+    }
+    b.result
+  }
+}
+
diff --git a/src/library/scalax/collection/generic/covartest/IterableForwarder.scala b/src/library/scala/collection/generic/TraversibleForwarder.scala
index 58290cfc68..855289d36c 100755
--- a/src/library/scalax/collection/generic/covartest/IterableForwarder.scala
+++ b/src/library/scala/collection/generic/TraversibleForwarder.scala
@@ -9,32 +9,31 @@
 // $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
 
 
-package scalax.collection.generic.covartest
+package scala.collection.generic
 
-import collection.mutable.Buffer
-import collection.immutable.{List, Stream}
+import mutable.Buffer
+// import immutable.{List, Nil, ::, Stream}
 
-/** This trait implements a forwarder for iterable objects. It forwards
+/** This trait implements a forwarder for traversible objects. It forwards
  *  all calls to a different iterable object, except for
  *
  *    - toString, hashCode, equals, stringPrefix
  *    - newBuilder, view
- *    - all calls creating a new iterable objetc of the same kind
+ *    - all calls creating a new iterable object of the same kind
  *
- *  The above methods are forwarded by subclass IterableProxy
+ *  The above methods are forwarded by subclass TraversibleProxy
  *
  *  @author  Martin Odersky
  *  @version 2.8
  */
-trait IterableForwarder[+A] extends Iterable[A] {
+trait TraversibleForwarder[+A] extends Traversible[A] {
 
   /** The iterable object to which calls are forwarded */
-  protected def underlying: Iterable[A]
+  protected def underlying: Traversible[A]
 
   // Iterable delegates
   // Iterable methods could be printed by  cat IterableTemplate.scala | sed -n '/trait Iterable/,$ p' | egrep '^  (override )?def'
 
-  override def elements = underlying.elements
   override def isEmpty = underlying.isEmpty
   override def hasDefiniteSize = underlying.hasDefiniteSize
   override def foreach(f: A => Unit) = underlying.foreach(f)
@@ -46,6 +45,8 @@ trait IterableForwarder[+A] extends Iterable[A] {
   override def foldRight[B](z: B)(op: (A, B) => B): B = underlying.foldRight(z)(op)
   override def reduceLeft[B >: A](op: (B, A) => B): B = underlying.reduceLeft(op)
   override def reduceRight[B >: A](op: (A, B) => B): B = underlying.reduceRight(op)
+  override def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B] = underlying.reduceLeftOpt(op)
+  override def reduceRightOpt[B >: A](op: (A, B) => B): Option[B] = underlying.reduceRightOpt(op)
   override def copyToBuffer[B >: A](dest: Buffer[B]) = underlying.copyToBuffer(dest)
   override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) = underlying.copyToArray(xs, start, len)
   override def toArray[B >: A]: Array[B] = underlying.toArray
@@ -56,4 +57,6 @@ trait IterableForwarder[+A] extends Iterable[A] {
   override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = underlying.addString(b, start, sep, end)
 
   override def head: A = underlying.head
+  override def last: A = underlying.last
+  override def lastOption: Option[A] = underlying.lastOption
 }
diff --git a/src/library/scala/collection/generic/TraversibleProxyTemplate.scala b/src/library/scala/collection/generic/TraversibleProxyTemplate.scala
new file mode 100755
index 0000000000..0c17aa4121
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleProxyTemplate.scala
@@ -0,0 +1,84 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
+
+
+package scala.collection.generic
+
+import collection.mutable.Buffer
+
+// Methods could be printed by  cat TraversibeTemplate.scala | egrep '^  (override )?def'
+
+
+/** This trait implements a proxy for traversible objects. It forwards
+ *  all calls to a different traversible object
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait TraversibleProxyTemplate[+A, +This <: TraversibleTemplate[A, This] with Traversible[A]] extends TraversibleTemplate[A, This] with Proxy {
+  def self: This
+
+  override def isEmpty: Boolean = self.isEmpty
+  override def size: Int = self.size
+  override def hasDefiniteSize = self.hasDefiniteSize
+  override def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = self.++(that)(bf)
+  override def ++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, This]): That = self.++(that)(bf)
+  override def map[B, That](f: A => B)(implicit bf: BuilderFactory[B, That, This]): That = self.map(f)(bf)
+  override def flatMap[B, That](f: A => Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = self.flatMap(f)(bf)
+  override def filter(p: A => Boolean): This = self.filter(p)
+  override def remove(p: A => Boolean): This = self.remove(p)
+  override def partition(p: A => Boolean): (This, This) = self.partition(p)
+  override def groupBy[K](f: A => K): Map[K, This] = self.groupBy(f)
+  override def foreach(f: A => Unit): Unit = self.foreach(f)
+  override def forall(p: A => Boolean): Boolean = self.forall(p)
+  override def exists(p: A => Boolean): Boolean = self.exists(p)
+  override def count(p: A => Boolean): Int = self.count(p)
+  override def find(p: A => Boolean): Option[A] = self.find(p)
+  override def foldLeft[B](z: B)(op: (B, A) => B): B = self.foldLeft(z)(op)
+  override def /: [B](z: B)(op: (B, A) => B): B = self./:(z)(op)
+  override def foldRight[B](z: B)(op: (A, B) => B): B = self.foldRight(z)(op)
+  override def :\ [B](z: B)(op: (A, B) => B): B = self.:\(z)(op)
+  override def reduceLeft[B >: A](op: (B, A) => B): B = self.reduceLeft(op)
+  override def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B] = self.reduceLeftOpt(op)
+  override def reduceRight[B >: A](op: (A, B) => B): B = self.reduceRight(op)
+  override def reduceRightOpt[B >: A](op: (A, B) => B): Option[B] = self.reduceRightOpt(op)
+  override def head: A = self.head
+  override def headOption: Option[A] = self.headOption
+  override def tail: This = self.tail
+  override def last: A = self.last
+  override def lastOption: Option[A] = self.lastOption
+  override def init: This = self.init
+  override def take(n: Int): This = self.take(n)
+  override def drop(n: Int): This = self.drop(n)
+  override def slice(from: Int, until: Int): This = self.slice(from, until)
+  override def takeWhile(p: A => Boolean): This = self.takeWhile(p)
+  override def dropWhile(p: A => Boolean): This = self.dropWhile(p)
+  override def span(p: A => Boolean): (This, This) = self.span(p)
+  override def splitAt(n: Int): (This, This) = self.splitAt(n)
+  override def copyToBuffer[B >: A](dest: Buffer[B]) = self.copyToBuffer(dest)
+  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) = self.copyToArray(xs, start, len)
+  override def copyToArray[B >: A](xs: Array[B], start: Int) = self.copyToArray(xs, start)
+  override def toArray[B >: A]: Array[B] = self.toArray
+  override def toList: List[A] = self.toList
+  override def toIterable: Iterable[A] = self.toIterable
+  override def toSequence: Sequence[A] = self.toSequence
+  override def toStream: Stream[A] = self.toStream
+//  override def sortWith(lt : (A,A) => Boolean): This = self.sortWith(lt)
+  override def mkString(start: String, sep: String, end: String): String = self.mkString(start, sep, end)
+  override def mkString(sep: String): String = self.mkString(sep)
+  override def mkString: String = self.mkString
+  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = self.addString(b, start, sep, end)
+  override def addString(b: StringBuilder, sep: String): StringBuilder = self.addString(b, sep)
+  override def addString(b: StringBuilder): StringBuilder = self.addString(b)
+  override def toString = self.toString
+  override def stringPrefix : String = self.stringPrefix
+  override def view = self.view
+  override def view(from: Int, until: Int): TraversibleView[A, This] = self.view(from, until)
+}
diff --git a/src/library/scala/collection/generic/TraversibleTemplate.scala b/src/library/scala/collection/generic/TraversibleTemplate.scala
new file mode 100755
index 0000000000..2ec74ba874
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleTemplate.scala
@@ -0,0 +1,742 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Traversible.scala 15188 2008-05-24 15:01:02Z stepancheg $
+package scala.collection.generic
+
+// import immutable.{List, Stream, Nil} //!!!
+import mutable.{Buffer, ArrayBuffer, ListBuffer}
+import util.control.Breaks._
+
+/** A template trait for traversible collections.
+ *
+ *  Collection classes mixing in this trait provide a method
+ *  <code>foreach</code> which traverses all the
+ *  elements contained in the collection, applying a given procedure to each.
+ *  They also provide a method `newBuilder`
+ *  which creates a builder for collections of the same kind.
+ *
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait TraversibleTemplate[+A, +This <: TraversibleTemplate[A, This] with Traversible[A]] {
+self =>
+
+  protected def thisCollection: This = this.asInstanceOf[This]
+
+  /** Create a new builder for this traversible type.
+   */
+  protected[this] def newBuilder: Builder[A, This, Any]
+
+  /** Is this collection empty?
+   */
+  def isEmpty: Boolean = {
+    var result = true
+    breakable {
+      for (x <- this) {
+        result = false
+        break
+      }
+    }
+    result
+  }
+
+  /** The number of elements in this collection */
+  def size: Int = {
+    var result = 0
+    breakable {
+      for (x <- this) result += 1
+    }
+    result
+  }
+
+  /** returns true iff this collection has a finite size.
+   *  Many methods in this trait will not work on collections of
+   *  infinite sizes.
+   */
+  def hasDefiniteSize = true
+
+  /** Creates a new traversible of type `That` which contains all elements of this traversible
+   *  followed by all elements of another traversible
+   *
+   *  @param that   The traversible to append
+   */
+  def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    b ++= thisCollection
+    b ++= that
+    b.result
+  }
+
+  /** Create a new traversible of type `That` which contains all elements of this traversible
+   *  followed by all elements of an iterator
+   *
+   *  @param that  The iterator to append
+   */
+  def ++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    b ++= thisCollection
+    b ++= that
+    b.result
+  }
+
+  /** Returns the traversible that results from applying the given function
+   *  <code>f</code> to each element of this traversible and collecing the results
+   *  in an traversible of type `That`.
+   *
+   *  @param f function to apply to each element.
+   *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
+   *           traversible is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
+   */
+  def map[B, That](f: A => B)(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    for (x <- this) b += f(x)
+    b.result
+  }
+
+  /** Applies the given function <code>f</code> to each element of
+   *  this traversible, then concatenates the results in an traversible of type CC.
+   *
+   *  @param f the function to apply on each element.
+   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
+   *           this traversible is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
+   */
+  def flatMap[B, That](f: A => Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    for (x <- this) b ++= f(x)
+    b.result
+  }
+
+  /** Returns all the elements of this traversible that satisfy the
+   *  predicate <code>p</code>. The order of the elements is preserved.
+   *  @param p the predicate used to filter the traversible.
+   *  @return the elements of this traversible satisfying <code>p</code>.
+   */
+  def filter(p: A => Boolean): This = {
+    val b = newBuilder
+    for (x <- this)
+      if (p(x)) b += x
+    b.result
+  }
+
+  /** Removes all elements of the traversible which satisfy the predicate
+   *  <code>p</code>. This is like <code>filter</code> with the
+   *  predicate inversed.
+   *
+   *  @param p the predicate used to test elements
+   *  @return  the traversible without all elements that satisfy <code>p</code>
+   */
+  def remove(p: A => Boolean): This = filter(!p(_))
+
+  /** Partitions this traversible in two traversibles according to a predicate.
+   *
+   *  @param p the predicate on which to partition
+   *  @return  a pair of traversibles: the traversible that satisfies the predicate
+   *           <code>p</code> and the traversible that does not.
+   *           The relative order of the elements in the resulting traversibles
+   *           is the same as in the original traversible.
+   */
+  def partition(p: A => Boolean): (This, This) = {
+    val l, r = newBuilder
+    for (x <- this) (if (p(x)) l else r) += x
+    (l.result, r.result)
+  }
+
+  /** Partion this traversible into a map of traversibles
+   *  according to some discriminator function.
+   *  @invariant   (xs partition f)(k) = xs filter (x => f(x) == k)
+   *
+   *  @note This method is not re-implemented by views. This means
+   *        when applied to a view it will always force the view and
+   *        return a new collection.
+   */
+  def groupBy[K](f: A => K): Map[K, This] = {
+    var m = Map[K, Builder[A, This, Any]]()
+    for (elem <- this) {
+      val key = f(elem)
+      val bldr = m get key match {
+        case None => val b = newBuilder; m = m add (key, b); b
+        case Some(b) => b
+      }
+      bldr += elem
+    }
+    m mapValues (_.result)
+  }
+
+  /** Apply a function <code>f</code> to all elements of this
+   *  traversible object.
+   *
+   *  @param  f   a function that is applied to every element.
+   *  @note This method underlies the implementation of most other bulk operations.
+   *  It should be overridden in concrete collection classes with efficient implementations.
+   */
+  def foreach(f: A => Unit): Unit
+
+  /** Return true iff the given predicate `p` yields true for all elements
+   *  of this traversible.
+   *
+   *  @note May not terminate for infinite-sized collections.
+   *  @param   p     the predicate
+   */
+  def forall(p: A => Boolean): Boolean = {
+    var result = true
+    breakable {
+      for (x <- this)
+        if (!p(x)) { result = false; break }
+    }
+    result
+  }
+
+  /** Return true iff there is an element in this traversible for which the
+   *  given predicate `p` yields true.
+   *
+   *  @note May not terminate for infinite-sized collections.
+   *  @param   p     the predicate
+   */
+  def exists(p: A => Boolean): Boolean = {
+    var result = false
+    breakable {
+      for (x <- this)
+        if (p(x)) { result = true; break }
+    }
+    result
+  }
+
+  /** Count the number of elements in the traversible which satisfy a predicate.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @param p the predicate for which to count
+   *  @return  the number of elements satisfying the predicate <code>p</code>.
+   */
+  def count(p: A => Boolean): Int = {
+    var cnt = 0
+    for (x <- this) {
+      if (p(x)) cnt += 1
+    }
+    cnt
+  }
+
+  /** Find and return the first element of the traversible object satisfying a
+   *  predicate, if any.
+   *
+   *  @note may not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this traversible is ordered.
+   *  @param p the predicate
+   *  @return an option containing the first element in the traversible object
+   *  satisfying <code>p</code>, or <code>None</code> if none exists.
+   */
+  def find(p: A => Boolean): Option[A] = {
+    var result: Option[A] = None
+    breakable {
+      for (x <- this)
+        if (p(x)) { result = Some(x); break }
+    }
+    result
+  }
+
+  /** Combines the elements of this traversible object together using the binary
+   *  function <code>f</code>, from left to right, and starting with
+   *  the value <code>z</code>.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this traversible is ordered, or
+   *        the operator is associative and commutative.
+   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
+   *          a<sub>n</sub>)</code> if the traversible is
+   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
+   */
+  def foldLeft[B](z: B)(op: (B, A) => B): B = {
+    var result = z
+    for (x <- this)
+      result = op(result, x)
+    result
+  }
+
+  /** Similar to <code>foldLeft</code> but can be used as
+   *  an operator with the order of traversible and zero arguments reversed.
+   *  That is, <code>z /: xs</code> is the same as <code>xs foldLeft z</code>
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this traversible is ordered, or
+   *        the operator is associative and commutative.
+   */
+  def /: [B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
+
+  /** Combines the elements of this iterable together using the binary
+   *  function <code>f</code>, from right to left, and starting with
+   *  the value <code>z</code>.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
+   *          if the iterable is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
+   */
+  def foldRight[B](z: B)(op: (A, B) => B): B = {
+    var elems: List[A] = Nil
+    for (x <- this) elems = x :: elems
+    elems.foldLeft(z)((x, y) => op(y, x))
+  }
+
+  /** An alias for <code>foldRight</code>.
+   *  That is, <code>xs :\ z</code> is the same as <code>xs foldRight z</code>
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   */
+  def :\ [B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
+
+  /** Combines the elements of this traversible object together using the binary
+   *  operator <code>op</code>, from left to right
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this traversible is ordered, or
+   *        the operator is associative and commutative.
+   *  @param op  The operator to apply
+   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
+      if the traversible object has elements
+   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
+   *  @throws Predef.UnsupportedOperationException if the traversible object is empty.
+   */
+  def reduceLeft[B >: A](op: (B, A) => B): B = {
+    if (isEmpty) throw new UnsupportedOperationException("empty.reduceLeft")
+    var result: B = head
+    var first = true
+    for (x <- this)
+      if (first) first = false
+      else result = op(result, x)
+    result
+  }
+
+  /** Combines the elements of this traversible object together using the binary
+   *  operator <code>op</code>, from left to right
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this traversible is ordered, or
+   *        the operator is associative and commutative.
+   *  @param op  The operator to apply
+   *  @return  If the traversible is non-empty, the result of the operations as an Option, otherwise None.
+   */
+  def reduceLeftOpt[B >: A](op: (B, A) => B): Option[B] = {
+    if (isEmpty) None else Some(reduceLeft(op))
+  }
+
+  /** Combines the elements of this iterable object together using the binary
+   *  operator <code>op</code>, from right to left
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   *  @param op  The operator to apply
+   *
+   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
+   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
+   *          a<sub>n</sub></code>.
+   *
+   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
+   */
+  def reduceRight[B >: A](op: (A, B) => B): B = {
+    if (isEmpty) throw new UnsupportedOperationException("empty.reduceRight")
+    var elems: List[A] = Nil
+    for (x <- this) elems = x :: elems
+    elems.reduceLeft[B]((x, y) => op(y, x))
+  }
+
+ /** Combines the elements of this iterable object together using the binary
+   *  operator <code>op</code>, from right to left.
+   *  @note Will not terminate for infinite-sized collections.
+   *  @note Might return different results for different runs, unless this iterable is ordered, or
+   *        the operator is associative and commutative.
+   *  @param op  The operator to apply
+   *  @return  If the iterable is non-empty, the result of the operations as an Option, otherwise None.
+   */
+  def reduceRightOpt[B >: A](op: (A, B) => B): Option[B] = {
+    if (isEmpty) None else Some(reduceRight(op))
+  }
+
+  /** The first element of this traversible.
+   *
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   *  @throws Predef.NoSuchElementException if the traversible is empty.
+   */
+  def head: A = {
+    var result: () => A = () => throw new NoSuchElementException
+    breakable {
+      for (x <- this) {
+        result = () => x
+        break
+      }
+    }
+    result()
+  }
+
+ /** Returns as an option the first element of this traversible
+   *  or <code>None</code> if traversible is empty.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def headOption: Option[A] = if (isEmpty) None else Some(head)
+
+  /** An traversible consisting of all elements of this traversible
+   *  except the first one.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def tail: This = drop(1)
+
+  /** The last element of this traversible.
+   *
+   *  @throws Predef.NoSuchElementException if the traversible is empty.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def last: A = {
+    var lst = head
+    for (x <- this)
+      lst = x
+    lst
+  }
+
+  /** Returns as an option the last element of this traversible or
+   *  <code>None</code> if traversible is empty.
+   *
+   *  @return the last element as an option.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def lastOption: Option[A] = if (isEmpty) None else Some(last)
+
+  /** An traversible consisting of all elements of this traversible except the last one.
+   *  @throws Predef.UnsupportedOperationException if the stream is empty.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def init: This = {
+    if (isEmpty) throw new UnsupportedOperationException("empty.init")
+    var lst = head
+    var follow = false
+    val b = newBuilder
+    for (x <- this) {
+      if (follow) b += lst
+      else follow = true
+      lst = x
+    }
+    b.result
+  }
+
+  /** Return an traversible consisting only of the first <code>n</code>
+   *  elements of this traversible, or else the whole traversible, if it has less
+   *  than <code>n</code> elements.
+   *
+   *  @param n the number of elements to take
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def take(n: Int): This = {
+    val b = newBuilder
+    var i = 0
+    breakable {
+      for (x <- this) {
+        b += x
+        i += 1
+        if (i == n) break
+      }
+    }
+    b.result
+  }
+
+  /** Returns this traversible without its <code>n</code> first elements
+   *  If this traversible has less than <code>n</code> elements, the empty
+   *  traversible is returned.
+   *
+   *  @param n the number of elements to drop
+   *  @return  the new traversible
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def drop(n: Int): This = {
+    val b = newBuilder
+    var i = 0
+    for (x <- this) {
+      if (i >= n) b += x
+      i += 1
+    }
+    b.result
+  }
+
+  /** A sub-traversible starting at index `from`
+   *  and extending up to (but not including) index `until`.
+   *
+   *  @note c.slice(from, to)  is equivalent to (but possibly more efficient than)
+   *  c.drop(from).take(to - from)
+   *
+   *  @param from   The index of the first element of the returned subsequence
+   *  @param until  The index of the element following the returned subsequence
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def slice(from: Int, until: Int): This = {
+    val b = newBuilder
+    var i = 0
+    breakable {
+      for (x <- this) {
+        if (i >= from) b += x
+        i += 1
+        if (i == until) break
+      }
+    }
+    b.result
+  }
+
+  /** Returns the longest prefix of this traversible whose elements satisfy
+   *  the predicate <code>p</code>.
+   *
+   *  @param p the test predicate.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def takeWhile(p: A => Boolean): This = {
+    val b = newBuilder
+    breakable {
+      for (x <- this) {
+        if (!p(x)) break
+        b += x
+      }
+    }
+    b.result
+  }
+
+  /** Returns the longest suffix of this traversible whose first element
+   *  does not satisfy the predicate <code>p</code>.
+   *
+   *  @param p the test predicate.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def dropWhile(p: A => Boolean): This = {
+    val b = newBuilder
+    var go = false
+    for (x <- this) {
+      if (!p(x)) go = true
+      if (go) b += x
+    }
+    b.result
+  }
+
+ /** Returns a pair consisting of the longest prefix of the traversible whose
+   *  elements all satisfy the given predicate, and the rest of the traversible.
+   *
+   *  @param p the test predicate
+   *  @return  a pair consisting of the longest prefix of the traversible whose
+   *           elements all satisfy <code>p</code>, and the rest of the traversible.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def span(p: A => Boolean): (This, This) = {
+    val l, r = newBuilder
+    var toLeft = true
+    for (x <- this) {
+      toLeft = toLeft && p(x)
+      (if (toLeft) l else r) += x
+    }
+    (l.result, r.result)
+  }
+
+  /** Split the traversible at a given point and return the two parts thus
+   *  created.
+   *
+   *  @param n the position at which to split
+   *  @return  a pair of traversibles composed of the first <code>n</code>
+   *           elements, and the other elements.
+   *  @note  Might return different results for different runs, unless this traversible is ordered
+   */
+  def splitAt(n: Int): (This, This) = {
+    val l, r = newBuilder
+    var i = 0
+    for (x <- this) {
+      (if (i < n) l else r) += x
+      i += 1
+    }
+    (l.result, r.result)
+  }
+
+  /** Copy all elements of this traversible to a given buffer
+   *  @note Will not terminate for infinite-sized collections.
+   *  @param  dest   The buffer to which elements are copied
+   */
+  def copyToBuffer[B >: A](dest: Buffer[B]) {
+    for (x <- this) dest += x
+  }
+
+  /** Fills the given array <code>xs</code> with at most `len` elements of
+   *  this traversible starting at position `start`.
+   *  Copying will stop once either the end of the current traversible is reached or
+   *  `len` elements have been copied or the end of the array is reached.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @param  xs the array to fill.
+   *  @param  start starting index.
+   *  @param  len number of elements to copy
+   */
+  def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
+    var i = start
+    val end = (start + len) min xs.length
+    breakable {
+      for (x <- this) {
+        if (i >= end) break
+        xs(i) = x
+        i += 1
+      }
+    }
+  }
+
+  /** Fills the given array <code>xs</code> with the elements of
+   *  this traversible starting at position <code>start</code>
+   *  until either the end of the current traversible or the end of array `xs` is reached.
+   *
+   *  @note Will not terminate for infinite-sized collections.
+   *  @param  xs the array to fill.
+   *  @param  start starting index.
+   *  @pre    the array must be large enough to hold all elements.
+   */
+  def copyToArray[B >: A](xs: Array[B], start: Int) {
+    copyToArray(xs, start, xs.length - start)
+  }
+
+  /** Converts this traversible to a fresh Array containing all elements.
+   *  @note  Will not terminate for infinite-sized collections.
+   */
+  def toArray[B >: A]: Array[B] = {
+    val result = new Array[B](size)
+    copyToArray(result, 0)
+    result
+  }
+
+  /** Returns a list with all elements of this traversible object.
+   *  @note Will not terminate for infinite-sized collections.
+   */
+  def toList: List[A] = (new ListBuffer[A] ++ thisCollection).toList
+
+  /** Returns an iterable with all elements in this traversible object.
+   *  @note Will not terminate for infinite-sized collections.
+   */
+  def toIterable: Iterable[A] = toStream
+
+  /** Returns a sequence with all elements in this traversible object.
+   *  @note Will not terminate for infinite-sized collections.
+   */
+  def toSequence: Sequence[A] = toList
+
+  /** Returns a stream with all elements in this traversible object.
+   */
+  def toStream: Stream[A] = toList.toStream
+
+  /** Sort the traversible according to the comparison function
+   *  <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>,
+   *  which should be true iff <code>e1</code> is smaller than
+   *  <code>e2</code>.
+   *  The sort is stable. That is elements that are equal wrt `lt` appear in the
+   *  same order in the sorted traversible as in the original.
+   *
+   *  @param lt the comparison function
+   *  @return   a traversible sorted according to the comparison function
+   *            <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>.
+   *  @ex <pre>
+   *    List("Steve", "Tom", "John", "Bob")
+   *      .sort((e1, e2) => (e1 compareTo e2) &lt; 0) =
+   *    List("Bob", "John", "Steve", "Tom")</pre>
+   *  !!!
+  def sortWith(lt : (A,A) => Boolean): This = {
+    val arr = toArray
+    Array.sortWith(arr, lt)
+    val b = newBuilder[A]
+    for (x <- arr) b += x
+    b.result
+  }
+  */
+
+  /** Returns a string representation of this traversible object. The resulting string
+   *  begins with the string <code>start</code> and is finished by the string
+   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
+   *  the method <code>toString()</code>) are separated by the string
+   *  <code>sep</code>.
+   *
+   *  @ex  <code>List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"</code>
+   *  @param start starting string.
+   *  @param sep separator string.
+   *  @param end ending string.
+   *  @return a string representation of this traversible object.
+   */
+  def mkString(start: String, sep: String, end: String): String =
+    addString(new StringBuilder(), start, sep, end).toString
+
+  /** Returns a string representation of this traversible object. The string
+   *  representations of elements (w.r.t. the method <code>toString()</code>)
+   *  are separated by the string <code>sep</code>.
+   *
+   *  @param sep separator string.
+   *  @return a string representation of this traversible object.
+   */
+  def mkString(sep: String): String =
+    addString(new StringBuilder(), sep).toString
+
+  /** Returns a string representation of this traversible object. The string
+   *  representations of elements (w.r.t. the method <code>toString()</code>)
+   *  follow each other without any separator string.
+   */
+  def mkString: String =
+    addString(new StringBuilder()).toString
+
+  /** Write all elements of this traversible into given string builder.
+   *  The written text begins with the string <code>start</code> and is finished by the string
+   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
+   *  the method <code>toString()</code>) are separated by the string
+   *  <code>sep</code>.
+   */
+  def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
+    b append start
+    var first = true
+    for (x <- this) {
+      if (first) first = false
+      else b append sep
+      b append x
+    }
+    b append end
+  }
+
+  /** Write all elements of this string into given string builder.
+   *  The string representations of elements (w.r.t. the method <code>toString()</code>)
+   *  are separated by the string <code>sep</code>.
+   */
+  def addString(b: StringBuilder, sep: String): StringBuilder = addString(b, "", sep, "")
+
+  /** Write all elements of this string into given string builder without using
+   *  any separator between consecutive elements.
+   */
+  def addString(b: StringBuilder): StringBuilder = addString(b, "")
+
+  override def toString = mkString(stringPrefix + "(", ", ", ")")
+
+  /** Defines the prefix of this object's <code>toString</code> representation.
+   */
+  def stringPrefix : String = {
+    var string = thisCollection.getClass.getName
+    val idx1 = string.lastIndexOf('.' : Int)
+    if (idx1 != -1) string = string.substring(idx1 + 1)
+    val idx2 = string.indexOf('$')
+    if (idx2 != -1) string = string.substring(0, idx2)
+    string
+  }
+
+  /** Creates a view of this traversible @see TraversibleView
+   */
+  def view = new TraversibleView[A, This] {
+    protected lazy val underlying = self.thisCollection
+    override def foreach(f: A => Unit) = self foreach f
+  }
+
+  /** A sub-traversible  starting at index `from`
+   *  and extending up to (but not including) index `until`.
+   *
+   *  @param from   The index of the first element of the slice
+   *  @param until  The index of the element following the slice
+   *  @note  The difference between `view` and `slice` is that `view` produces
+   *         a view of the current iterable, whereas `slice` produces a new iterable.
+   *
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   *  @note view(from, to)  is equivalent to view.slice(from, to)
+   */
+  def view(from: Int, until: Int): TraversibleView[A, This] = view.slice(from, until)
+}
+
+
diff --git a/src/library/scala/collection/generic/TraversibleView.scala b/src/library/scala/collection/generic/TraversibleView.scala
new file mode 100755
index 0000000000..8c45e9690d
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleView.scala
@@ -0,0 +1,29 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.generic
+
+import Math.MAX_INT
+import TraversibleView.NoBuilder
+
+/** A base class for views of Traversible.
+ *  Every subclass has to implenment the foreach method
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait TraversibleView[+A, +Coll <: Traversible[_]] extends TraversibleViewTemplate[A, Coll, TraversibleView[A, Coll]]
+
+object TraversibleView {
+  class NoBuilder[A] extends Builder[A, Nothing, TraversibleView[_, _]] {
+    def +=(elem: A) {}
+    def elements: Iterator[A] = Iterator.empty
+    def result() = throw new UnsupportedOperationException("TraversibleView.Builder.result")
+    def clear() {}
+  }
+  type Coll = TraversibleView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, TraversibleView[A, Traversible[_]], Coll] = new BuilderFactory[A, TraversibleView[A, Traversible[_]], Coll] { def apply(from: Coll) = new NoBuilder }
+}
diff --git a/src/library/scala/collection/generic/TraversibleView.scala.1 b/src/library/scala/collection/generic/TraversibleView.scala.1
new file mode 100755
index 0000000000..c0999f9b9c
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleView.scala.1
@@ -0,0 +1,145 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scalay.collection.generic
+
+import Math.MAX_INT
+import TraversibleView.NoBuilder
+
+/** A base class for views of Traversible.
+ *  Every subclass has to implenment the foreach method
+ */
+abstract class TraversibleView[+A, +Coll <: Traversible[_]] extends Traversible[A] { 
+self =>
+
+  type This >: this.type <: TraversibleView[A, Coll] { type This = self.This }
+  protected val thisCollection: This = this
+
+  protected[this] def newBuilder: Builder[A, This, This] = 
+    throw new UnsupportedOperationException(this+".newBuilder")
+
+  def force[B >: A, That](implicit b: Builder[B, That, Coll]) = {
+    b ++= this
+    b.result()
+  }
+
+  trait Transformed[+B] extends TraversibleView[B, Coll]
+
+  /** pre: from >= 0  
+   */
+  trait Sliced extends Transformed[A] {
+    protected[this] val from: Int
+    protected[this] val until: Int
+    override def foreach(f: A => Unit) {
+      var index = 0
+      for (x <- self) {
+        if (from <= index) {
+          if (until <= index) return
+          f(x)
+        }
+        index += 1
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"S"
+    override def slice(from1: Int, until1: Int) =
+      newSliced(from + (from1 max 0), from + (until1 max 0)).asInstanceOf[This]
+  }
+
+  trait Mapped[B] extends Transformed[B] {
+    protected[this] val mapping: A => B
+    override def foreach(f: B => Unit) {
+      for (x <- self)
+        f(mapping(x))
+    }
+    override def stringPrefix = self.stringPrefix+"M"
+  }
+
+  trait FlatMapped[B] extends Transformed[B] {
+    protected[this] val mapping: A => Traversible[B]
+    override def foreach(f: B => Unit) {
+      for (x <- self)
+        for (y <- mapping(x))
+          f(y)
+    }
+    override def stringPrefix = self.stringPrefix+"N"
+  }
+
+  trait Appended[B >: A] extends Transformed[B] {
+    protected[this] val rest: Traversible[B]
+    override def foreach(f: B => Unit) {
+      for (x <- self) f(x)
+      for (x <- rest) f(x)
+    }
+    override def stringPrefix = self.stringPrefix+"A"
+  }    
+
+  trait Filtered extends Transformed[A] {
+    protected[this] val pred: A => Boolean 
+    override def foreach(f: A => Unit) {
+      for (x <- self)
+        if (pred(x)) f(x)
+    }
+    override def stringPrefix = self.stringPrefix+"F"
+  }
+
+  trait TakenWhile extends Transformed[A] {
+    protected[this] val pred: A => Boolean 
+    override def foreach(f: A => Unit) {
+      for (x <- self) {
+        if (!pred(x)) return
+        f(x)
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"T"
+  }
+
+  trait DroppedWhile extends Transformed[A] {
+    protected[this] val pred: A => Boolean 
+    override def foreach(f: A => Unit) {
+      var go = false
+      for (x <- self) {
+        if (!go && !pred(x)) go = true
+        if (go) f(x)
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"D"
+  }
+  
+  override def ++[B >: A, That](that: Traversible[B])(implicit b: Builder[B, That, This]): That =
+    if (b.isInstanceOf[NoBuilder[_]]) newAppended(that).asInstanceOf[That]
+    else super.++[B, That](that)(b) 
+ 
+  override def ++[B >: A, That](that: Iterator[B])(implicit b: Builder[B, That, This]): That = ++[B, That](that.toStream)
+
+  override def map[B, That](f: A => B)(implicit b: Builder[B, That, This]): That =
+    if (b.isInstanceOf[NoBuilder[_]]) newMapped(f).asInstanceOf[That]
+    else super.map[B, That](f)(b) 
+
+  override def flatMap[B, That](f: A => Traversible[B])(implicit b: Builder[B, That, This]): That =
+    if (b.isInstanceOf[NoBuilder[_]]) newFlatMapped(f).asInstanceOf[That]
+    else super.flatMap[B, That](f)(b)
+  
+  override def filter(p: A => Boolean): This = newFiltered(p).asInstanceOf[This]
+  override def init: This = newSliced(0, size - 1).asInstanceOf[This]
+  override def drop(n: Int): This = newSliced(n max 0, MAX_INT).asInstanceOf[This]
+  override def take(n: Int): This = newSliced(0, n).asInstanceOf[This]
+  override def slice(from: Int, until: Int): This = newSliced(from max 0, until).asInstanceOf[This]
+  override def dropWhile(p: A => Boolean): This = newDroppedWhile(p).asInstanceOf[This]
+  override def takeWhile(p: A => Boolean): This = newTakenWhile(p).asInstanceOf[This]
+  override def span(p: A => Boolean): (This, This) = (takeWhile(p), dropWhile(p))
+  override def splitAt(n: Int): (This, This) = (take(n), drop(n))
+}
+
+object TraversibleView {
+  class NoBuilder[A] extends Builder[A, Nothing, TraversibleView[_, _]] {
+    def +=(elem: A) {}
+    def elements: Iterator[A] = Iterator.empty
+    def result() = throw new UnsupportedOperationException("TraversibleView.Builder.result")
+    def clear() {}
+  }
+  implicit def implicitBuilder[A]: Builder[A, TraversibleView[A, Traversible[_]], TraversibleView[_, _]] = new NoBuilder
+}
diff --git a/src/library/scala/collection/generic/TraversibleViewTemplate.scala b/src/library/scala/collection/generic/TraversibleViewTemplate.scala
new file mode 100755
index 0000000000..7cb84d5cfc
--- /dev/null
+++ b/src/library/scala/collection/generic/TraversibleViewTemplate.scala
@@ -0,0 +1,160 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.generic
+
+import Math.MAX_INT
+import TraversibleView.NoBuilder
+
+/** A base class for views of Traversible.
+ *  Every subclass has to implenment the foreach method
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+trait TraversibleViewTemplate[+A,
+                              +Coll <: Traversible[_],
+                              +This <: TraversibleView[A, Coll] with TraversibleViewTemplate[A, Coll, This]]
+  extends Traversible[A] with TraversibleTemplate[A, This] {
+self =>
+
+  override protected[this] def newBuilder: Builder[A, This, Any] =
+    throw new UnsupportedOperationException(this+".newBuilder")
+
+  protected def underlying: Coll
+
+  def force[B >: A, That](implicit bf: BuilderFactory[B, That, Coll]) = {
+    val b = bf(underlying)
+    b ++= this
+    b.result()
+  }
+
+  trait Transformed[+B] extends TraversibleView[B, Coll] {
+    lazy val underlying = self.underlying
+  }
+
+  /** pre: from >= 0
+   */
+  trait Sliced extends Transformed[A] {
+    protected[this] val from: Int
+    protected[this] val until: Int
+    override def foreach(f: A => Unit) {
+      var index = 0
+      for (x <- self) {
+        if (from <= index) {
+          if (until <= index) return
+          f(x)
+        }
+        index += 1
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"S"
+    override def slice(from1: Int, until1: Int): This =
+      newSliced(from + (from1 max 0), from + (until1 max 0)).asInstanceOf[This]
+  }
+
+  trait Mapped[B] extends Transformed[B] {
+    protected[this] val mapping: A => B
+    override def foreach(f: B => Unit) {
+      for (x <- self)
+        f(mapping(x))
+    }
+    override def stringPrefix = self.stringPrefix+"M"
+  }
+
+  trait FlatMapped[B] extends Transformed[B] {
+    protected[this] val mapping: A => Traversible[B]
+    override def foreach(f: B => Unit) {
+      for (x <- self)
+        for (y <- mapping(x))
+          f(y)
+    }
+    override def stringPrefix = self.stringPrefix+"N"
+  }
+
+  trait Appended[B >: A] extends Transformed[B] {
+    protected[this] val rest: Traversible[B]
+    override def foreach(f: B => Unit) {
+      for (x <- self) f(x)
+      for (x <- rest) f(x)
+    }
+    override def stringPrefix = self.stringPrefix+"A"
+  }
+
+  trait Filtered extends Transformed[A] {
+    protected[this] val pred: A => Boolean
+    override def foreach(f: A => Unit) {
+      for (x <- self)
+        if (pred(x)) f(x)
+    }
+    override def stringPrefix = self.stringPrefix+"F"
+  }
+
+  trait TakenWhile extends Transformed[A] {
+    protected[this] val pred: A => Boolean
+    override def foreach(f: A => Unit) {
+      for (x <- self) {
+        if (!pred(x)) return
+        f(x)
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"T"
+  }
+
+  trait DroppedWhile extends Transformed[A] {
+    protected[this] val pred: A => Boolean
+    override def foreach(f: A => Unit) {
+      var go = false
+      for (x <- self) {
+        if (!go && !pred(x)) go = true
+        if (go) f(x)
+      }
+    }
+    override def stringPrefix = self.stringPrefix+"D"
+  }
+
+  /** Boilerplate method, to override in each subclass
+   *  This method could be eliminated if Scala had virtual classes
+   */
+  protected def newAppended[B >: A](that: Traversible[B]): Transformed[B] = new Appended[B] { val rest = that }
+  protected def newMapped[B](f: A => B): Transformed[B] = new Mapped[B] { val mapping = f }
+  protected def newFlatMapped[B](f: A => Traversible[B]): Transformed[B] = new FlatMapped[B] { val mapping = f }
+  protected def newFiltered(p: A => Boolean): Transformed[A] = new Filtered { val pred = p }
+  protected def newSliced(_from: Int, _until: Int): Transformed[A] = new Sliced { val from = _from; val until = _until }
+  protected def newDroppedWhile(p: A => Boolean): Transformed[A] = new DroppedWhile { val pred = p }
+  protected def newTakenWhile(p: A => Boolean): Transformed[A] = new TakenWhile { val pred = p }
+
+  override def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    if (b.isInstanceOf[NoBuilder[_]]) newAppended(that).asInstanceOf[That]
+    else super.++[B, That](that)(bf)
+  }
+
+  override def ++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, This]): That = ++[B, That](that.toStream)
+
+  override def map[B, That](f: A => B)(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    if (b.isInstanceOf[NoBuilder[_]]) newMapped(f).asInstanceOf[That]
+    else super.map[B, That](f)(bf)
+  }
+
+  override def flatMap[B, That](f: A => Traversible[B])(implicit bf: BuilderFactory[B, That, This]): That = {
+    val b = bf(thisCollection)
+    if (b.isInstanceOf[NoBuilder[_]]) newFlatMapped(f).asInstanceOf[That]
+    else super.flatMap[B, That](f)(bf)
+  }
+
+  override def filter(p: A => Boolean): This = newFiltered(p).asInstanceOf[This]
+  override def init: This = newSliced(0, size - 1).asInstanceOf[This]
+  override def drop(n: Int): This = newSliced(n max 0, MAX_INT).asInstanceOf[This]
+  override def take(n: Int): This = newSliced(0, n).asInstanceOf[This]
+  override def slice(from: Int, until: Int): This = newSliced(from max 0, until).asInstanceOf[This]
+  override def dropWhile(p: A => Boolean): This = newDroppedWhile(p).asInstanceOf[This]
+  override def takeWhile(p: A => Boolean): This = newTakenWhile(p).asInstanceOf[This]
+  override def span(p: A => Boolean): (This, This) = (takeWhile(p), dropWhile(p))
+  override def splitAt(n: Int): (This, This) = (take(n), drop(n))
+}
+
diff --git a/src/library/scalax/collection/generic/covartest/VectorTemplate.scala b/src/library/scala/collection/generic/VectorTemplate.scala
index 8c28077ea3..96c9e125dc 100644..100755
--- a/src/library/scalax/collection/generic/covartest/VectorTemplate.scala
+++ b/src/library/scala/collection/generic/VectorTemplate.scala
@@ -8,39 +8,46 @@
 
 // $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
 
-package scalax.collection.generic.covartest
+package scala.collection.generic
 
-import Vector._
+import mutable.ArrayBuffer
 
 /** Sequences that support O(1) element access and O(1) length computation.
+ *  This class does not add any methods to Sequence but overrides several
+ *  methods with optimized implementations.
+ *
  *  @author Sean McDirmid
  *  @author Martin Odersky
  *  @version 2.8
  */
-trait VectorTemplate[+CC[+B] <: VectorTemplate[CC, B] with Vector[B], +A] extends SequenceTemplate[CC, A] {
-self =>
+trait VectorTemplate[+A, +This <: VectorTemplate[A, This] with Vector[A]] extends SequenceTemplate[A, This] { self =>
 
   // Overridden methods from IterableTemplate
 
   /** The iterator returned by the elements method
    */
-  protected class Elements(start: Int, end: Int) extends scalax.collection.BufferedIterator[A] {
-    var i = start
+  protected class Elements(start: Int, end: Int) extends scala.collection.BufferedIterator[A] {
+    private var i = start
+
     def hasNext: Boolean = i < end
+
     def next: A =
       if (i < end) {
         val x = self(i)
         i += 1
         x
       } else Iterator.empty.next
+
     def head =
       if (i < end) self(i) else Iterator.empty.next
+
     /** drop is overridden to enable fast searching in the middle of random access sequences */
     override def drop(n: Int): Iterator[A] =
       if (n > 0) new Elements(start + n, end) else this
-    /**  is overridden to be symmetric to drop */
+
+    /** take is overridden to be symmetric to drop */
     override def take(n: Int): Iterator[A] =
-      if (n < 0) Iterator.empty.buffered
+      if (n <= 0) Iterator.empty.buffered
       else if (start + n < end) new Elements(start, start + n)
       else this
   }
@@ -78,53 +85,35 @@ self =>
     if (start == len) z
     else op(this(start), foldr(start + 1, len, z, op))
 
-  override def foldLeft[B](z: B)(op: (B, A) => B): B = foldl(0, z, op)
-  override def foldRight[B](z: B)(op: (A, B) => B): B = foldr(0, length, z, op)
+  override def foldLeft[B](z: B)(op: (B, A) => B): B =
+    foldl(0, z, op)
+  override def foldRight[B](z: B)(op: (A, B) => B): B =
+    foldr(0, length, z, op)
   override def reduceLeft[B >: A](op: (B, A) => B): B =
-    if (length > 0) foldl(0, this(0), op) else super.reduceLeft(op)
+    if (length > 0) foldl(1, this(0), op) else super.reduceLeft(op)
   override def reduceRight[B >: A](op: (A, B) => B): B =
     if (length > 0) foldr(0, length - 1, this(length - 1), op) else super.reduceRight(op)
 
-  override def zip[B](that: Iterable[B]): CC[(A, B)] = that match {
-    case that: Vector[_] =>
-      var i = 0
-      val len = this.length min that.length
-      val b = this.newBuilder[(A, B)]
-      while (i < len) {
-        b += ((this(i), that(i).asInstanceOf[B]))
-        i += 1
-      }
-      b.result
-    case _ =>
-      super.zip(that)
-  }
-
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): CC[(A1, B1)] = that match {
+  override def zip[A1 >: A, B, That](that: Sequence[B])(implicit bf: BuilderFactory[(A1, B), That, This]): That = that match {
     case that: Vector[_] =>
+      val b = bf(thisCollection)
       var i = 0
       val len = this.length min that.length
-      val b = this.newBuilder[(A1, B1)]
+      b.sizeHint(len)
       while (i < len) {
         b += ((this(i), that(i).asInstanceOf[B]))
         i += 1
       }
-      while (i < this.length) {
-        b += ((this(i), thatElem))
-        i += 1
-      }
-      while (i < that.length) {
-        b += ((this(i), thatElem.asInstanceOf[B]))
-        i += 1
-      }
       b.result
     case _ =>
-      super.zipAll(that, thisElem, thatElem)
+      super.zip[A1, B, That](that)(bf)
   }
 
-  override def zipWithIndex: CC[(A, Int)] = {
-    val b = newBuilder[(A, Int)]
-    var i = 0
+  override def zipWithIndex[A1 >: A, That](implicit bf: BuilderFactory[(A1, Int), That, This]): That = {
+    val b = bf(thisCollection)
     val len = length
+    b.sizeHint(len)
+    var i = 0
     while (i < len) {
       b += ((this(i), i))
       i += 1
@@ -132,25 +121,11 @@ self =>
     b.result
   }
 
-  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
-    var i = 0
-    var j = start
-    val end = length min len min (xs.length - start)
-    while (i < end) {
-      xs(j) = this(i)
-      i += 1
-      j += 1
-    }
-  }
-
-  // Overridden methods from OrderedIterableTemplate
-
-  override def head: A = if (isEmpty) throw new NoSuchElementException else this(0)
-
-  override def slice(from: Int, until: Int): CC[A] = {
-    val b = newBuilder[A]
+  override def slice(from: Int, until: Int): This = {
     var i = from max 0
     val end = until min length
+    val b = newBuilder
+    b.sizeHint(end - i)
     while (i < end) {
       b += this(i)
       i += 1
@@ -158,18 +133,20 @@ self =>
     b.result
   }
 
-  override def take(n: Int): CC[A] = slice(0, n)
-  override def drop(n: Int): CC[A] = slice(n, length)
-  override def takeRight(n: Int): CC[A] = slice(length - n, length)
-  override def dropRight(n: Int): CC[A] = slice(0, length - n)
-  override def splitAt(n: Int): (CC[A], CC[A]) = (take(n), drop(n))
-  override def takeWhile(p: A => Boolean): CC[A] = take(prefixLength(p))
-  override def dropWhile(p: A => Boolean): CC[A] = drop(prefixLength(p))
-  override def span(p: A => Boolean): (CC[A], CC[A]) = splitAt(prefixLength(p))
+  override def head: A = if (isEmpty) super.head else this(0)
+  override def tail: This = slice(1, length)
   override def last: A = if (length > 0) this(length - 1) else super.last
-  override def init: CC[A] = if (length > 0) slice(0, length - 1) else super.init
-
-  override def sameElements[B >: A](that: OrderedIterable[B]): Boolean = that match {
+  override def init: This = if (length > 0) slice(0, length - 1) else super.init
+  override def take(n: Int): This = slice(0, n)
+  override def drop(n: Int): This = slice(n, length)
+  override def takeRight(n: Int): This = slice(length - n, length)
+  override def dropRight(n: Int): This = slice(0, length - n)
+  override def splitAt(n: Int): (This, This) = (take(n), drop(n))
+  override def takeWhile(p: A => Boolean): This = take(prefixLength(p))
+  override def dropWhile(p: A => Boolean): This = drop(prefixLength(p))
+  override def span(p: A => Boolean): (This, This) = splitAt(prefixLength(p))
+
+  override def sameElements[B >: A](that: Iterable[B]): Boolean = that match {
     case that: Vector[_] =>
       val len = length
       len == that.length && {
@@ -181,14 +158,35 @@ self =>
       super.sameElements(that)
   }
 
+  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
+    var i = 0
+    var j = start
+    val end = length min len min (xs.length - start)
+    while (i < end) {
+      xs(j) = this(i)
+      i += 1
+      j += 1
+    }
+  }
+
   // Overridden methods from Sequence
 
   override def lengthCompare(len: Int): Int = length - len
 
+  override def segmentLength(p: A => Boolean, from: Int): Int = {
+    val start = from
+    val len = length
+    var i = start
+    while (i < len && p(this(i))) i += 1
+    i - start
+  }
+
   private def negLength(n: Int) = if (n == length) -1 else n
 
-  override def indexWhere(p: A => Boolean, from: Int): Int =
-    negLength(from + segmentLength(!p(_), from))
+  override def indexWhere(p: A => Boolean, from: Int): Int = {
+    val start = from max 0
+    negLength(start + segmentLength(!p(_), start))
+  }
 
   override def lastIndexWhere(p: A => Boolean, end: Int): Int = {
     var i = end
@@ -196,10 +194,9 @@ self =>
     i
   }
 
-  override def lastIndexOf[B >: A](elem: B, end: Int): Int = lastIndexWhere(elem ==, end)
-
-  override def reverse: CC[A] = {
-    val b = newBuilder[A]
+  override def reverse: This = {
+    val b = newBuilder
+    b.sizeHint(length)
     var i = length
     while (0 < i) {
       i -= 1
@@ -209,7 +206,7 @@ self =>
   }
 
   override def reversedElements: Iterator[A] = new Iterator[A] {
-    var i = length
+    private var i = self.length
     def hasNext: Boolean = 0 < i
     def next: A =
       if (0 < i) {
@@ -233,7 +230,7 @@ self =>
       var i = offset
       val thisLen = length
       val thatElems = that.elements
-      while (i < thisLen && thatElems.hasNext && this(i) == thatElems.next) {
+      while (i < thisLen && thatElems.hasNext && this(i) == thatElems.next()) {
         i += 1
       }
       !thatElems.hasNext
@@ -254,11 +251,32 @@ self =>
       super.endsWith(that)
   }
 
-  override def indexOf[B >: A](that: Sequence[B]): Int = {
+  override def indexOfSeq[B >: A](that: Sequence[B]): Int = {
     var i = 0
     val last = length - that.length
     while (i <= last && !startsWith(that, i)) i += 1
     negLength(i)
   }
+
+  override def equals(that: Any): Boolean = that match {
+    case that1: Vector[a] =>
+      val len = this.length
+      len == that1.length && {
+        var i = 0
+        while (i < len && this(i) == that1(i)) i += 1
+        i == len
+      }
+    case _ =>
+      super.equals(that)
+  }
+
+  override def view = new VectorView[A, This] {
+    protected lazy val underlying = self.thisCollection
+    override def elements = self.elements
+    override def length = self.length
+    override def apply(idx: Int) = self.apply(idx)
+  }
+
+  override def view(from: Int, until: Int) = view.slice(from, until)
 }
 
diff --git a/src/library/scala/collection/generic/VectorView.scala b/src/library/scala/collection/generic/VectorView.scala
new file mode 100755
index 0000000000..5460ac9f70
--- /dev/null
+++ b/src/library/scala/collection/generic/VectorView.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait VectorView[+A, +Coll <: Vector[_]] extends VectorViewTemplate[A, Coll, VectorView[A, Coll]]
+
+object VectorView {
+  type Coll = TraversibleView[_, _]
+  implicit def builderFactory[A]: BuilderFactory[A, VectorView[A, Vector[_]], Coll] = new BuilderFactory[A, VectorView[A, Vector[_]], Coll] { def apply(from: Coll) = new NoBuilder }
+}
diff --git a/src/library/scala/collection/generic/VectorViewTemplate.scala b/src/library/scala/collection/generic/VectorViewTemplate.scala
new file mode 100755
index 0000000000..e8744a3230
--- /dev/null
+++ b/src/library/scala/collection/generic/VectorViewTemplate.scala
@@ -0,0 +1,80 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
+
+
+package scala.collection.generic
+
+import TraversibleView.NoBuilder
+
+/** A non-strict projection of an iterable.
+ * @author Sean McDirmid
+ * @author Martin Odersky
+ * @version 2.8
+ */
+trait VectorViewTemplate[+A,
+                         +Coll <: Vector[_],
+                         +This <: VectorView[A, Coll] with VectorViewTemplate[A, Coll, This]]
+  extends Vector[A] with VectorTemplate[A, This] with SequenceView[A, Coll] with SequenceViewTemplate[A, Coll, This]
+{ self =>
+
+  trait Transformed[+B] extends VectorView[B, Coll] with super.Transformed[B]
+
+  trait Sliced extends Transformed[A] with super.Sliced {
+    /** Override to use Vector's foreach; todo: see whether this is really faster */
+    override def foreach(f: A => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait Mapped[B] extends Transformed[B] with super.Mapped[B] {
+    override def foreach(f: B => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait FlatMapped[B] extends Transformed[B] with super.FlatMapped[B] {
+    override def foreach(f: B => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait Appended[B >: A] extends Transformed[B] with super.Appended[B] {
+    override def foreach(f: B => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait Filtered extends Transformed[A] with super.Filtered {
+    override def foreach(f: A => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait TakenWhile extends Transformed[A] with super.TakenWhile {
+    override def foreach(f: A => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait DroppedWhile extends Transformed[A] with super.DroppedWhile {
+    override def foreach(f: A => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait Reversed extends Transformed[A] with super.Reversed {
+    override def foreach(f: A => Unit) = super[Transformed].foreach(f)
+  }
+
+  trait Patched[B >: A] extends Transformed[B] with super.Patched[B] {
+    override def foreach(f: B => Unit) = super[Transformed].foreach(f)
+  }
+
+  /** Boilerplate method, to override in each subclass
+   *  This method could be eliminated if Scala had virtual classes
+   */
+  protected override def newAppended[B >: A](that: Traversible[B]): Transformed[B] = new Appended[B] { val rest = that }
+  protected override def newMapped[B](f: A => B): Transformed[B] = new Mapped[B] { val mapping = f }
+  protected override def newFlatMapped[B](f: A => Traversible[B]): Transformed[B] = new FlatMapped[B] { val mapping = f }
+  protected override def newFiltered(p: A => Boolean): Transformed[A] = new Filtered { val pred = p }
+  protected override def newSliced(_from: Int, _until: Int): Transformed[A] = new Sliced { val from = _from; val until = _until }
+  protected override def newDroppedWhile(p: A => Boolean): Transformed[A] = new DroppedWhile { val pred = p }
+  protected override def newTakenWhile(p: A => Boolean): Transformed[A] = new TakenWhile { val pred = p }
+  protected override def newReversed: Transformed[A] = new Reversed { }
+  protected override def newPatched[B >: A](_from: Int, _patch: Sequence[B], _replaced: Int): Transformed[B] = new Patched[B] {
+    val from = _from; val patch = _patch; val replaced = _replaced
+  }
+}
diff --git a/src/library/scala/collection/immutable/BitSet.scala b/src/library/scala/collection/immutable/BitSet.scala
index eb276699bd..575d8dfd7d 100644
--- a/src/library/scala/collection/immutable/BitSet.scala
+++ b/src/library/scala/collection/immutable/BitSet.scala
@@ -11,43 +11,70 @@
 
 package scala.collection.immutable
 
+import BitSet._
+import generic._
 
-/** The class <code>BitSet</code> provides an immutable bitset view on an
- *  int array. Instances can conveniently be created from instances of
- *  Bit indices are between <code>0..(capacity-1)</code> inclusive.
- *
- *  @param size     <code>size</code> represents the number of relevant bits
- *  @param capacity ...
- *  @param ba       <code>ba</code> array of ints of length
- *                  <code>n&gt;&gt;&gt;5</code>
- *  @param copy     <code>copy</code> if yes, then <code>ba</code> is copied
- *                  and updates will not affect this bitset
- *
- *  @author  Burak Emir, Nikolay Mihaylov
- *  @version 1.0
+/** a base class for immutable bit sets
  */
+abstract class BitSet extends Set[Int] with collection.BitSet with BitSetTemplate[BitSet] {
+  override def empty = BitSet.empty
+  def fromArray(elems: Array[Long]): BitSet = BitSet.fromArray(elems)
+}
 
-@serializable
-/*
- *                This is a strange class! It claims to be immutable but is not.
- *                It claims to be a BitSet but it is not a Set.
- *                Remove it or integrate it into the Set hierarchy.
- *                [Comments by Martin]
- */
-class BitSet(val size: Int, val capacity: Int, ba: Array[Int], copy: Boolean)
-  extends collection.BitSet
-{
-  import compat.Platform.arraycopy
-
-  protected val arr: Array[Int] = {
-    val ba1 = if (ba != null) ba else new Array[Int](0)
-    if (copy) {
-      val arr = new Array[Int](ba1.length)
-      arraycopy(ba1, 0, arr, 0, ba1.length)
-      arr
-    }
-    else
-      ba1
+/** A factory object for bitsets */
+object BitSet {
+
+  /** The empty bitset */
+  val empty: BitSet = new BitSet1(0L)
+
+  /** A bitset containing given elements */
+  def apply(elems: Int*) = (empty /: elems) (_ + _)
+
+  /** A bitset containing all the bits in an array */
+  def fromArray(elems: Array[Long]): BitSet = {
+    val len = elems.length
+    if (len == 0) empty
+    else if (len == 1) new BitSet1(elems(0))
+    else if (len == 2) new BitSet2(elems(0), elems(1))
+    else new BitSetN(elems)
+  }
+
+  private val hashSeed = "BitSet".hashCode
+
+  private def updateArray(elems: Array[Long], idx: Int, w: Long): BitSet = {
+    var len = elems.length
+    while (len > 0 && (elems(len - 1) == 0L || w == 0L && idx == len - 1)) len -= 1
+    var newlen = len
+    if (idx >= newlen && w != 0L) newlen = idx + 1
+    val newelems = new Array[Long](newlen)
+    Array.copy(elems, 0, newelems, 0, len)
+    if (idx < newlen) newelems(idx) = w
+    else assert(w == 0L)
+    fromArray(newelems)
+  }
+
+  class BitSet1(val elems: Long) extends BitSet {
+    protected def nwords = 1
+    protected def word(idx: Int) = if (idx == 0) elems else 0L
+    protected def updateWord(idx: Int, w: Long): BitSet =
+      if (idx == 0) new BitSet1(w)
+      else if (idx == 1) new BitSet2(elems, w)
+      else updateArray(Array(elems), idx, w)
   }
 
+  class BitSet2(val elems0: Long, elems1: Long) extends BitSet {
+    protected def nwords = 2
+    protected def word(idx: Int) = if (idx == 0) elems0 else if (idx == 1) elems1 else 0L
+    protected def updateWord(idx: Int, w: Long): BitSet =
+      if (idx == 0) new BitSet2(w, elems1)
+      else if (idx == 1) new BitSet2(elems0, w)
+      else updateArray(Array(elems0, elems1), idx, w)
+  }
+
+  class BitSetN(val elems: Array[Long]) extends BitSet {
+    protected def nwords = elems.length
+    protected def word(idx: Int) = if (idx < nwords) elems(idx) else 0L
+    protected def updateWord(idx: Int, w: Long): BitSet = updateArray(elems, idx, w)
+  }
 }
+
diff --git a/src/library/scala/collection/immutable/EmptyMap.scala b/src/library/scala/collection/immutable/EmptyMap.scala
deleted file mode 100644
index 70e0a766cd..0000000000
--- a/src/library/scala/collection/immutable/EmptyMap.scala
+++ /dev/null
@@ -1,39 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-import Predef.Pair
-
-/** This class implements empty immutable maps
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class EmptyMap[A, +B] extends Map[A, B] {
-
-  def size: Int = 0
-
-  def get(key: A): Option[B] = None
-
-  def elements: Iterator[(A, B)] = Iterator.empty
-
-  def empty[C]: Map[A, C] = new EmptyMap[A, C]
-
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
-    new Map1(key, value)
-
-  def - (key: A): Map[A, B] = this
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/FlexMap.scala b/src/library/scala/collection/immutable/FlexMap.scala
new file mode 100755
index 0000000000..eb982734a3
--- /dev/null
+++ b/src/library/scala/collection/immutable/FlexMap.scala
@@ -0,0 +1,143 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Map.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+package scala.collection.immutable
+
+import generic._
+
+/** A default implementation of immutable maps.
+ *  This is implemented by specialized implementations
+ *  `EmptyMap`, Map1, ..., Map4, for maps of size up to 4, and
+ *  a proxy for an immutable HashMap for larger maps.
+ */
+trait FlexMap[A, +B] extends Map[A, B] { self =>
+  override def empty: Map[A, B] = FlexMap.empty
+}
+
+/* Factory object for `FlexMap class */
+object FlexMap extends ImmutableMapFactory[Map] {
+  def empty[A, B]: FlexMap[A, B] = new EmptyMap[A, B]
+
+  @serializable
+  class EmptyMap[A, +B] extends FlexMap[A, B] {
+    override def size: Int = 0
+    def get(key: A): Option[B] = None
+    def elements: Iterator[(A, B)] = Iterator.empty
+    def add [B1 >: B] (key: A, value: B1): Map[A, B1] = new Map1(key, value)
+    def - (key: A): Map[A, B] = this
+  }
+
+  @serializable
+  class Map1[A, +B](key1: A, value1: B) extends FlexMap[A, B] {
+    override def size = 1
+    def get(key: A): Option[B] =
+      if (key == key1) Some(value1) else None
+    def elements = Iterator((key1, value1))
+    def add [B1 >: B] (key: A, value: B1): Map[A, B1] =
+      if (key == key1) new Map1(key1, value)
+      else new Map2(key1, value1, key, value)
+    def - (key: A): Map[A, B] =
+      if (key == key1) empty else this
+    override def foreach(f: ((A, B)) => Unit): Unit = {
+      f((key1, value1))
+    }
+  }
+
+  @serializable
+  class Map2[A, +B](key1: A, value1: B, key2: A, value2: B) extends FlexMap[A, B] {
+    override def size = 2
+    def get(key: A): Option[B] =
+      if (key == key1) Some(value1)
+      else if (key == key2) Some(value2)
+      else None
+    def elements = Iterator((key1, value1), (key2, value2))
+    def add [B1 >: B] (key: A, value: B1): Map[A, B1] =
+      if (key == key1) new Map2(key1, value, key2, value2)
+      else if (key == key2) new Map2(key1, value1, key2, value)
+      else new Map3(key1, value1, key2, value2, key, value)
+    def - (key: A): Map[A, B] =
+      if (key == key1) new Map1(key2, value2)
+      else if (key == key2) new Map1(key1, value1)
+      else this
+    override def foreach(f: ((A, B)) => Unit): Unit = {
+      f((key1, value1)); f((key2, value2))
+    }
+  }
+
+  @serializable
+  class Map3[A, +B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B) extends FlexMap[A, B] {
+    override def size = 3
+    def get(key: A): Option[B] =
+      if (key == key1) Some(value1)
+      else if (key == key2) Some(value2)
+      else if (key == key3) Some(value3)
+      else None
+    def elements = Iterator((key1, value1), (key2, value2), (key3, value3))
+    def add [B1 >: B] (key: A, value: B1): Map[A, B1] =
+      if (key == key1)      new Map3(key1, value, key2, value2, key3, value3)
+      else if (key == key2) new Map3(key1, value1, key2, value, key3, value3)
+      else if (key == key3) new Map3(key1, value1, key2, value2, key3, value)
+      else new Map4(key1, value1, key2, value2, key3, value3, key, value)
+    def - (key: A): Map[A, B] =
+      if (key == key1)      new Map2(key2, value2, key3, value3)
+      else if (key == key2) new Map2(key1, value1, key3, value3)
+      else if (key == key3) new Map2(key1, value1, key2, value2)
+      else this
+    override def foreach(f: ((A, B)) => Unit): Unit = {
+      f((key1, value1)); f((key2, value2)); f((key3, value3))
+    }
+  }
+
+  @serializable
+  class Map4[A, +B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B, key4: A, value4: B) extends FlexMap[A, B] {
+    override def size = 4
+    def get(key: A): Option[B] =
+      if (key == key1) Some(value1)
+      else if (key == key2) Some(value2)
+      else if (key == key3) Some(value3)
+      else if (key == key4) Some(value4)
+      else None
+    def elements = Iterator((key1, value1), (key2, value2), (key3, value3), (key4, value4))
+    def add [B1 >: B] (key: A, value: B1): Map[A, B1] =
+      if (key == key1)      new Map4(key1, value, key2, value2, key3, value3, key4, value4)
+      else if (key == key2) new Map4(key1, value1, key2, value, key3, value3, key4, value4)
+      else if (key == key3) new Map4(key1, value1, key2, value2, key3, value, key4, value4)
+      else if (key == key4) new Map4(key1, value1, key2, value2, key3, value3, key4, value)
+      else new HashMap + ((key1, value1), (key2, value2), (key3, value3), (key4, value4), (key, value))
+    def - (key: A): Map[A, B] =
+      if (key == key1)      new Map3(key2, value2, key3, value3, key4, value4)
+      else if (key == key2) new Map3(key1, value1, key3, value3, key4, value4)
+      else if (key == key3) new Map3(key1, value1, key2, value2, key4, value4)
+      else if (key == key4) new Map3(key1, value1, key2, value2, key3, value3)
+      else this
+    override def foreach(f: ((A, B)) => Unit): Unit = {
+      f((key1, value1)); f((key2, value2)); f((key3, value3)); f((key4, value4))
+    }
+  }
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/src/library/scala/collection/immutable/FlexSet.scala b/src/library/scala/collection/immutable/FlexSet.scala
new file mode 100755
index 0000000000..350ac96854
--- /dev/null
+++ b/src/library/scala/collection/immutable/FlexSet.scala
@@ -0,0 +1,120 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: HashSet.scala 16884 2009-01-09 16:52:09Z cunei $
+
+package scala.collection.immutable
+
+import generic._
+
+/** A default implementation of immutable sets.
+ *  This is implemented by specialized implementations
+ *  `EmptySet`, Set1, ..., Set4, for sets of size up to 4, and
+ *  a proxy for an immutable HashSet for larger sets.
+ */
+trait FlexSet[A] extends Set[A] { self =>
+  override def empty = FlexSet.empty
+}
+
+/* Factory object for `FlexSet` class */
+object FlexSet extends SetFactory[Set] {
+  def empty[A]: FlexSet[A] = new EmptySet[A]
+
+  /** An optimized representation for immutable empty sets */
+  @serializable
+  class EmptySet[A] extends FlexSet[A] {
+    override def size: Int = 0
+    def contains(elem: A): Boolean = false
+    def + (elem: A): Set[A] = new Set1(elem)
+    def - (elem: A): Set[A] = this
+    def elements: Iterator[A] = Iterator.empty
+    override def foreach(f: A => Unit): Unit = {}
+  }
+
+  /** An optimized representation for immutable sets of size 1 */
+  @serializable
+  class Set1[A](elem1: A) extends FlexSet[A] {
+    override def size: Int = 1
+    def contains(elem: A): Boolean =
+      elem == elem1
+    def + (elem: A): Set[A] =
+      if (contains(elem)) this
+      else new Set2(elem1, elem)
+    def - (elem: A): Set[A] =
+      if (elem == elem1) new EmptySet[A]
+      else this
+    def elements: Iterator[A] =
+      Iterator(elem1)
+    override def foreach(f: A => Unit): Unit = {
+      f(elem1)
+    }
+  }
+
+  /** An optimized representation for immutable sets of size 2 */
+  @serializable
+  class Set2[A](elem1: A, elem2: A) extends FlexSet[A] {
+    override def size: Int = 2
+    def contains(elem: A): Boolean =
+      elem == elem1 || elem == elem2
+    def + (elem: A): Set[A] =
+      if (contains(elem)) this
+      else new Set3(elem1, elem2, elem)
+    def - (elem: A): Set[A] =
+      if (elem == elem1) new Set1(elem2)
+      else if (elem == elem2) new Set1(elem1)
+      else this
+    def elements: Iterator[A] =
+      Iterator(elem1, elem2)
+    override def foreach(f: A => Unit): Unit = {
+      f(elem1); f(elem2)
+    }
+  }
+
+  /** An optimized representation for immutable sets of size 3 */
+  @serializable
+  class Set3[A](elem1: A, elem2: A, elem3: A) extends FlexSet[A] {
+    override def size: Int = 3
+    def contains(elem: A): Boolean =
+      elem == elem1 || elem == elem2 || elem == elem3
+    def + (elem: A): Set[A] =
+      if (contains(elem)) this
+      else new Set4(elem1, elem2, elem3, elem)
+    def - (elem: A): Set[A] =
+      if (elem == elem1) new Set2(elem2, elem3)
+      else if (elem == elem2) new Set2(elem1, elem3)
+      else if (elem == elem3) new Set2(elem1, elem2)
+      else this
+    def elements: Iterator[A] =
+      Iterator(elem1, elem2, elem3)
+    override def foreach(f: A => Unit): Unit = {
+      f(elem1); f(elem2); f(elem3)
+    }
+  }
+
+  /** An optimized representation for immutable sets of size 4 */
+  @serializable
+  class Set4[A](elem1: A, elem2: A, elem3: A, elem4: A) extends FlexSet[A] {
+    override def size: Int = 4
+    def contains(elem: A): Boolean =
+      elem == elem1 || elem == elem2 || elem == elem3 || elem == elem4
+    def + (elem: A): Set[A] =
+      if (contains(elem)) this
+      else new HashSet[A] + (elem1, elem2, elem3, elem4, elem)
+    def - (elem: A): Set[A] =
+      if (elem == elem1) new Set3(elem2, elem3, elem4)
+      else if (elem == elem2) new Set3(elem1, elem3, elem4)
+      else if (elem == elem3) new Set3(elem1, elem2, elem4)
+      else if (elem == elem4) new Set3(elem1, elem2, elem3)
+      else this
+    def elements: Iterator[A] =
+      Iterator(elem1, elem2, elem3, elem4)
+    override def foreach(f: A => Unit): Unit = {
+      f(elem1); f(elem2); f(elem3); f(elem4)
+    }
+  }
+}
diff --git a/src/library/scala/collection/immutable/HashMap.scala b/src/library/scala/collection/immutable/HashMap.scala
index 8c00df3f21..1c1cfbe929 100644
--- a/src/library/scala/collection/immutable/HashMap.scala
+++ b/src/library/scala/collection/immutable/HashMap.scala
@@ -11,48 +11,39 @@
 
 package scala.collection.immutable
 
-import Predef._
-
-/** The canonical factory methods for <a href="HashMap.html">immutable HashMap's</a>.
+import generic._
+import annotation.unchecked.uncheckedVariance
+
+/** This class implements immutable maps using a hash table.
+ * It is optimized for sequential accesses where the last updated table is accessed most often.
+ * It supports with reasonable efficiency accesses to previous versions of the table by keeping
+ * a change log that's regularly compacted.
+ * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
+ *
+ * @note the builder of a hash map returns specialized representations EmptyMap,Map1,..., Map4
+ * for maps of size <= 4.
  *
  *  @author  Martin Odersky
  *  @version 2.0, 19/01/2007
  */
-object HashMap {
-
-  /** The empty map of this type */
-  def empty[A, B] = new HashMap[A, B]
-
-  /** The canonical factory for this type
-   */
-  def apply[A, B](elems: (A, B)*) = empty[A, B] ++ elems
-}
-
-/** This class implements immutable maps/sets using a hash table.
-  * It is optimized for sequential accesses where the last updated table is accessed most often.
-  * It supports with reasonable efficiency accesses to previous versions of the table by keeping
-  * a change log that's regularly compacted.
-  * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.0, 19/01/2007
-  */
 @serializable
-class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
-  type Entry = mutable.DefaultEntry[A, Any]
+class HashMap[A, +B] extends Map[A,B] with ImmutableMapTemplate[A, B, HashMap[A, B]] with mutable.HashTable[A] {
+
+  type Entry = collection.mutable.DefaultEntry[A, Any]
 
-  protected var later: HashMap[A, B] = null
+  protected var later: HashMap[A, B @uncheckedVariance] = null
   protected var oldKey: A = _
-  protected var oldValue: Option[B] = _
+  protected var oldValue: Option[B @uncheckedVariance] = _
   protected var deltaSize: Int = _
 
-  def empty[C]: Map[A, C] = new EmptyMap[A, C]
+  override def empty = HashMap.empty[A, B]
+  override def mapBuilder[A, B]: Builder[(A, B), HashMap[A, B], Any] = HashMap.newBuilder[A, B]
 
   def get(key: A): Option[B] = synchronized {
-    var m = this
+    var m: HashMap[A, _ >: B] = this
     var cnt = 0
     while (m.later != null) {
-      if (key == m.oldKey) return m.oldValue
+      if (key == m.oldKey) return m.oldValue.asInstanceOf[Option[B]]
       cnt += 1
       m = m.later
     }
@@ -62,7 +53,7 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
     else Some(getValue(e))
   }
 
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] = synchronized {
+  def add [B1 >: B] (key: A, value: B1): HashMap[A, B1] = synchronized {
     makeCopyIfUpdated()
     val e = findEntry(key)
     if (e == null) {
@@ -72,22 +63,39 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
       markUpdated(key, Some(getValue(e)), 0)
       e.value = value
     }
-    later
+    later.asInstanceOf[HashMap[A, B1]]
   }
 
-  def - (key: A): Map[A, B] = synchronized {
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
+   */
+  override def + [B1 >: B] (kv: (A, B1)): HashMap[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): HashMap[A, B1] =
+    this + elem1 + elem2 ++ collection.Iterable.fromOld(elems)
+
+  def - (key: A): HashMap[A, B] = synchronized {
     makeCopyIfUpdated()
     val e = findEntry(key)
     if (e == null) this
     else {
       markUpdated(key, Some(getValue(e)), -1)
       later removeEntry key
-      later
+      later.asInstanceOf[HashMap[A, B]]
     }
   }
 
   override def size: Int = synchronized {
-    var m = this
+    var m: HashMap[A, _ >: B] = this
     var cnt = 0
     var s = 0
     while (m.later != null) {
@@ -110,7 +118,7 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
 
   private def logLimit: Int = Math.sqrt(table.length).toInt
 
-  private def markUpdated(key: A, ov: Option[B], delta: Int) {
+  private[this] def markUpdated(key: A, ov: Option[B], delta: Int) {
     val lv = loadFactor
     later = new HashMap[A, B] {
       override def initialSize = 0
@@ -124,8 +132,8 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
     deltaSize = delta
   }
 
-  private def makeCopy(last: HashMap[A, B]) {
-    def undo(m: HashMap[A, B]) {
+  private def makeCopy(last: HashMap[A, _ >: B]) {
+    def undo(m: HashMap[A, _ >: B]) {
       if (m ne last) {
         undo(m.later)
         if (m.deltaSize == 1) removeEntry(m.oldKey)
@@ -143,7 +151,7 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
       }
     val ltable = last.table
     val s = ltable.length
-    table = new Array[mutable.HashEntry[A, Entry]](s)
+    table = new scala.Array[collection.mutable.HashEntry[A, Entry]](s)
     var i = 0
     while (i < s) {
       table(i) = copy(ltable(i).asInstanceOf[Entry])
@@ -156,9 +164,20 @@ class HashMap[A, B] extends Map[A,B] with mutable.HashTable[A] {
   }
 
   private def makeCopyIfUpdated() {
-    var m = this
+    var m: HashMap[A, _ >: B] = this
     while (m.later != null) m = m.later
     if (m ne this) makeCopy(m)
   }
 }
 
+/** A factory object for immutable HashMaps.
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+object HashMap extends ImmutableMapFactory[HashMap] {
+  type Coll = HashMap[_, _]
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), HashMap[A, B], Coll] = new BuilderFactory[(A, B), HashMap[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
+  def empty[A, B]: HashMap[A, B] = new HashMap
+}
+
diff --git a/src/library/scala/collection/immutable/HashSet.scala b/src/library/scala/collection/immutable/HashSet.scala
index 11573e17ea..d5ee878c76 100644
--- a/src/library/scala/collection/immutable/HashSet.scala
+++ b/src/library/scala/collection/immutable/HashSet.scala
@@ -10,39 +10,30 @@
 
 package scala.collection.immutable
 
-/** The canonical factory methods for <a href="HashSet.html">immutable HashSet's<la>.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.0, 19/01/2007
-  */
-object HashSet {
-
-  /** The empty set of this type.
-   */
-  def empty[A] = new HashSet[A]
+import generic._
+
+/** This class implements immutable sets using a hash table.
+ * It is optimized for sequential accesses where the last updated table is accessed most often.
+ * It supports with reasonable efficiency accesses to previous versions of the table by keeping
+ * a change log that's regularly compacted.
+ * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
+ *
+ * @note the builder of a hash set returns specialized representations EmptySet,Set1,..., Set4
+ * for sets of size <= 4.
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+@serializable
+class HashSet[A] extends Set[A] with SetTemplate[A, HashSet[A]] with mutable.FlatHashTable[A] {
 
-  /** The canonical factory for this type
-   */
-  def apply[A](elems: A*) = empty[A] ++ elems
-}
+  override def empty = HashSet.empty
+  override def traversibleBuilder[B]: Builder[B, HashSet[B], Any] = HashSet.newBuilder[B]
 
-/** This class implements immutable maps/sets using a hash table.
-  * It is optimized for sequential accesses where the last updated table is accessed most often.
-  * It supports with reasonable efficiency accesses to previous versions of the table by keeping
-  * a change log that's regularly compacted.
-  * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.0, 19/01/2007
-  */
-@serializable
-class HashSet[A] extends Set[A] with mutable.FlatHashTable[A] {
   protected var later: HashSet[A] = null
   protected var changedElem: A = _
   protected var deleted: Boolean = _
 
-  def empty[C]: Set[C] = new EmptySet[C]
-
   def contains(elem: A): Boolean = synchronized {
     var m = this
     var cnt = 0
@@ -55,7 +46,7 @@ class HashSet[A] extends Set[A] with mutable.FlatHashTable[A] {
     m.containsEntry(elem)
   }
 
-  def + (elem: A): Set[A] = synchronized {
+  def + (elem: A): HashSet[A] = synchronized {
     makeCopyIfUpdated()
     if (containsEntry(elem)) this
     else {
@@ -65,7 +56,7 @@ class HashSet[A] extends Set[A] with mutable.FlatHashTable[A] {
     }
   }
 
-  def - (elem: A): Set[A] = synchronized {
+  def - (elem: A): HashSet[A] = synchronized {
     makeCopyIfUpdated()
     if (!containsEntry(elem)) this
     else {
@@ -119,8 +110,8 @@ class HashSet[A] extends Set[A] with mutable.FlatHashTable[A] {
         else removeEntry(m.changedElem)
       }
     }
-    table = new Array[AnyRef](last.table.length)
-    Array.copy(last.table, 0, table, 0, table.length)
+    table = new scala.Array[AnyRef](last.table.length)
+    scala.Array.copy(last.table, 0, table, 0, table.length)
     tableSize = last.tableSize
     threshold = last.threshold
     undo(this)
@@ -134,3 +125,14 @@ class HashSet[A] extends Set[A] with mutable.FlatHashTable[A] {
   }
 }
 
+/** A factory object for immutable HashSets
+  *
+  *  @author  Martin Odersky
+  *  @version 2.8
+  */
+object HashSet extends SetFactory[HashSet] {
+  type Coll = HashSet[_]
+  implicit def builderFactory[A]: BuilderFactory[A, HashSet[A], Coll] = new BuilderFactory[A, HashSet[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def empty[A]: HashSet[A] = new HashSet
+}
+
diff --git a/src/library/scala/collection/immutable/ImmutableIterator.scala b/src/library/scala/collection/immutable/ImmutableIterator.scala.disabled
index 70d75e1dde..7733c17bec 100644
--- a/src/library/scala/collection/immutable/ImmutableIterator.scala
+++ b/src/library/scala/collection/immutable/ImmutableIterator.scala.disabled
@@ -8,6 +8,7 @@
 
 // $Id$
 
+// Not clear whether this is needed. How is it different from a Stream?
 package scala.collection.immutable
 
 /** An object for creating immutable iterators.
@@ -40,9 +41,9 @@ object ImmutableIterator {
    *  by a lazy immutable iterator (right).
    */
   def apply[A](left : ImmutableIterator[A], item : A, right : () => ImmutableIterator[A]) : ImmutableIterator[A] = left match {
-  case NonEmpty(first, middle) =>
+  case NonEmpty(first, middle) => 
     val rest = NonEmpty(item,right);
-    NonEmpty(first, apply(middle, () => rest));
+    NonEmpty(first, apply(middle, () => rest));  
   case Empty => NonEmpty(item, right);
   }
 
diff --git a/src/library/scala/collection/immutable/IntMap.scala b/src/library/scala/collection/immutable/IntMap.scala
index c05f7ec1a8..69c68eb135 100644
--- a/src/library/scala/collection/immutable/IntMap.scala
+++ b/src/library/scala/collection/immutable/IntMap.scala
@@ -42,7 +42,7 @@ object IntMap{
   def empty[T] : IntMap[T]  = IntMap.Nil;
   def singleton[T](key : Int, value : T) : IntMap[T] = IntMap.Tip(key, value);
   def apply[T](elems : (Int, T)*) : IntMap[T] =
-    elems.foldLeft(empty[T])((x, y) => x.update(y._1, y._2));
+    elems.foldLeft(empty[T])((x, y) => x.add(y._1, y._2));
 
 
   private[immutable] case object Nil extends IntMap[Nothing]{
@@ -133,8 +133,8 @@ import IntMap._;
  * <a href="http://citeseer.ist.psu.edu/okasaki98fast.html">Fast Mergeable Integer Maps</a>
  * by Okasaki and Gill. Essentially a trie based on binary digits of the the integers.
  */
-sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
-  def empty[S] : IntMap[S] = IntMap.Nil;
+sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T] with scala.collection.generic.ImmutableMapTemplate[Int, T, IntMap[T]] {
+  override def empty: IntMap[T] = IntMap.Nil;
 
   override def toList = {
     val buffer = new scala.collection.mutable.ListBuffer[(Int, T)];
@@ -209,13 +209,13 @@ sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
     case IntMap.Nil => IntMap.Nil;
   }
 
-  override def transform[S](f : (Int, T) => S) : IntMap[S] = this match {
+  def transform[S](f : (Int, T) => S) : IntMap[S] = this match {
     case b@IntMap.Bin(prefix, mask, left, right) => b.bin(left.transform(f), right.transform(f));
     case t@IntMap.Tip(key, value) => t.withValue(f(key, value));
     case IntMap.Nil => IntMap.Nil;
   }
 
-  final def size : Int = this match {
+  final override def size : Int = this match {
     case IntMap.Nil => 0;
     case IntMap.Tip(_, _) => 1;
     case IntMap.Bin(_, _, left, right) => left.size + right.size;
@@ -239,15 +239,18 @@ sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
     case IntMap.Nil => error("key not found");
   }
 
-  def update[S >: T](key : Int, value : S) : IntMap[S] = this match {
+  def add[S >: T](key : Int, value : S) : IntMap[S] = this match {
     case IntMap.Bin(prefix, mask, left, right) => if (!hasMatch(key, prefix, mask)) join(key, IntMap.Tip(key, value), prefix, this);
-                                          else if (zero(key, mask)) IntMap.Bin(prefix, mask, left.update(key, value), right)
-                                          else IntMap.Bin(prefix, mask, left, right.update(key, value));
+                                          else if (zero(key, mask)) IntMap.Bin(prefix, mask, left.add(key, value), right)
+                                          else IntMap.Bin(prefix, mask, left, right.add(key, value));
     case IntMap.Tip(key2, value2) => if (key == key2) IntMap.Tip(key, value);
                              else join(key, IntMap.Tip(key, value), key2, this);
     case IntMap.Nil => IntMap.Tip(key, value);
   }
 
+  /** @deprecated use add instead */
+  @deprecated override def update[S >: T](key: Int, value: S): IntMap[S] = add(key, value)
+
   /**
    * Updates the map, using the provided function to resolve conflicts if the key is already present.
    * Equivalent to
@@ -370,11 +373,8 @@ sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
    */
   def intersection[R](that : IntMap[R]) : IntMap[T] = this.intersectionWith(that, (key : Int, value : T, value2 : R) => value);
 
-  override def ++[S >: T](that : Iterable[(Int, S)]) = that match {
-    case (that : IntMap[_]) => this.unionWith[S](that.asInstanceOf[IntMap[S]], (key, x, y) => y);
-    case that => that.foldLeft(this : IntMap[S])({case (m, (x, y)) => m.update(x, y)});
-  }
-
+  def ++[S >: T](that : IntMap[S]) =
+    this.unionWith[S](that, (key, x, y) => y)
 
   /**
    * The entry with the lowest key value considered in unsigned order.
@@ -382,7 +382,7 @@ sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
   final def firstKey : Int = this match {
     case Bin(_, _, l, r) => l.firstKey;
     case Tip(k, v) => k;
-    case Nil => error("Empty set")
+    case IntMap.Nil => error("Empty set")
   }
 
   /**
@@ -391,7 +391,6 @@ sealed abstract class IntMap[+T] extends scala.collection.immutable.Map[Int, T]{
   final def lastKey : Int = this match {
     case Bin(_, _, l, r) => r.lastKey;
     case Tip(k, v) => k;
-    case Nil => error("Empty set")
+    case IntMap.Nil => error("Empty set")
   }
 }
-
diff --git a/src/library/scala/collection/immutable/Iterable.scala b/src/library/scala/collection/immutable/Iterable.scala
new file mode 100755
index 0000000000..602ee1fffb
--- /dev/null
+++ b/src/library/scala/collection/immutable/Iterable.scala
@@ -0,0 +1,23 @@
+package scala.collection.immutable
+
+import generic._
+
+/** A subtrait of collection.Iterable which represents iterables
+ *  that cannot be mutated.
+ *
+ *  @author  Matthias Zenger
+ *  @autor   Martin Odersky
+ *  @version 2.8
+ */
+trait Iterable[+A] extends Traversible[A] with collection.Iterable[A] with IterableTemplate[A, Iterable[A]] { self =>
+  override protected[this] def newBuilder = Iterable.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Iterable[B], Any] = Iterable.newBuilder[B]
+}
+
+/* A factory object for the trait `Iterable` */
+object Iterable extends TraversibleFactory[Iterable] {
+  type Coll = Iterable[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Iterable[A], Coll] = new BuilderFactory[A, Iterable[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Iterable[A], Any] = new mutable.ListBuffer
+}
+
diff --git a/src/library/scala/collection/immutable/LinearSequence.scala b/src/library/scala/collection/immutable/LinearSequence.scala
new file mode 100755
index 0000000000..0508ecca29
--- /dev/null
+++ b/src/library/scala/collection/immutable/LinearSequence.scala
@@ -0,0 +1,17 @@
+package scala.collection.immutable
+
+import generic._
+
+/** A subtrait of collection.Sequence which represents sequences
+ *  that cannot be mutated.
+ */
+trait LinearSequence[+A] extends Sequence[A] with collection.LinearSequence[A] with LinearSequenceTemplate[A, LinearSequence[A]] {
+  override protected[this] def newBuilder = LinearSequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, LinearSequence[B], Any] = LinearSequence.newBuilder[B]
+}
+
+object LinearSequence extends SequenceFactory[LinearSequence] {
+  type Coll = LinearSequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, LinearSequence[A], Coll] = new BuilderFactory[A, LinearSequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, LinearSequence[A], Any] = new mutable.ListBuffer
+}
diff --git a/src/library/scalax/collection/immutable/List.scala b/src/library/scala/collection/immutable/List.scala
index cb5965a18a..4670539917 100644..100755
--- a/src/library/scalax/collection/immutable/List.scala
+++ b/src/library/scala/collection/immutable/List.scala
@@ -9,11 +9,10 @@
 // $Id: List.scala 16287 2008-10-18 13:41:36Z nielsen $
 
 
-package scalax.collection.immutable
+package scala.collection.immutable
 
 import mutable.ListBuffer
-import generic.{SequenceTemplate, SequenceFactory, EmptyIterableFactory, Builder}
-import annotation.unchecked.uncheckedVariance
+import generic.{SequenceFactory, Builder, BuilderFactory, LinearSequenceTemplate}
 
 /** A class representing an ordered collection of elements of type
  *  <code>a</code>. This class comes with two implementing case
@@ -24,11 +23,9 @@ import annotation.unchecked.uncheckedVariance
  *  @author  Martin Odersky and others
  *  @version 2.8
  */
-sealed abstract class List[+A] extends Stream[A]
-                                  with SequenceTemplate[List, A @uncheckedVariance]
-                                  with Product {
+sealed abstract class List[+A] extends LinearSequence[A] with Product with LinearSequenceTemplate[A, List[A]] {
 
-  import collection.{Iterable, OrderedIterable, Sequence, Vector}
+  import collection.{Iterable, Traversible, Sequence, Vector}
 
   /** Returns true if the list does not contain any elements.
    *  @return <code>true</code>, iff the list is empty.
@@ -50,7 +47,8 @@ sealed abstract class List[+A] extends Stream[A]
   def tail: List[A]
 
   /** Creates a list buffer as builder for this class */
-  override def newBuilder[B]: Builder[List, B] = new ListBuffer[B]
+  override protected[this] def newBuilder = List.newBuilder
+  override def traversibleBuilder[B]: Builder[B, List[B], Any] = List.newBuilder[B]
 
   // New methods in List
 
@@ -63,7 +61,7 @@ sealed abstract class List[+A] extends Stream[A]
    *  @ex <code>1 :: List(2, 3) = List(2, 3).::(1) = List(1, 2, 3)</code>
    */
   def ::[B >: A] (x: B): List[B] =
-    new scalax.collection.immutable.::(x, this)
+    new scala.collection.immutable.::(x, this)
 
   /** <p>
    *    Returns a list resulting from the concatenation of the given
@@ -99,7 +97,7 @@ sealed abstract class List[+A] extends Stream[A]
   /** Apply a function to all the elements of the list, and return the
    *  reversed list of results. This is equivalent to a call to <code>map</code>
    *  followed by a call to <code>reverse</code>, but more efficient.
-   *  !!! should we deprecate this? Why have reverseMap, but not filterMap, say?
+   *  !!! should we deprecate this? Why have reverseMap, but not filterMap or reverseFilter, say?
    *  @param f the function to apply to each elements.
    *  @return  the reversed list of results.
    */
@@ -112,8 +110,8 @@ sealed abstract class List[+A] extends Stream[A]
   }
 
   /** Like xs map f, but returns <code>xs</code> unchanged if function
-   *  <code>f</code> maps all elements to themselves (wrt eq)
-   *  @note Unlike `map`, `mapConserve` is not tail-recursive
+   *  <code>f</code> maps all elements to themselves (wrt ==).
+   *  @note Unlike `map`, `mapConserve` is not tail-recursive.
    */
   def mapConserve[B >: A] (f: A => B): List[B] = {
     def loop(ys: List[A]): List[B] =
@@ -121,7 +119,7 @@ sealed abstract class List[+A] extends Stream[A]
       else {
         val head0 = ys.head
         val head1 = f(head0)
-        if (head1.asInstanceOf[AnyRef] eq head0.asInstanceOf[AnyRef]) {
+        if (head1 == head0) {
           loop(ys.tail)
         } else {
           val ys1 = head1 :: ys.tail.mapConserve(f)
@@ -142,10 +140,20 @@ sealed abstract class List[+A] extends Stream[A]
 
   // Overridden methods from IterableTemplate or overloaded variants of such methods
 
-  /** Appends two list objects.
+  /** Create a new list which contains all elements of this list
+   *  followed by all elements of Traversible `that'
    */
-  override def ++[B >: A](that: Iterable[B]): List[B] =
-    this ::: that.toList
+  override def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, List[A]]): That = {
+    val b = bf(this)
+    if (b.isInstanceOf[ListBuffer[_]]) (this ::: that.toList).asInstanceOf[That]
+    else super.++(that)
+  }
+
+  /** Create a new list which contains all elements of this list
+   *  followed by all elements of Iterator `that'
+   */
+  override def ++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, List[A]]): That =
+    this ++ that.toList
 
   /** Overrides the method in Iterable for efficiency.
    *
@@ -195,9 +203,9 @@ sealed abstract class List[+A] extends Stream[A]
    *  @return the list with elements belonging to the given index range.
    */
   override def slice(start: Int, end: Int): List[A] = {
-    val s = start max 0
-    val e = end min this.length
-    drop(s) take (e - s)
+    var len = end
+    if (start > 0) len -= start
+    drop(start) take len
   }
 
   /** Returns the rightmost <code>n</code> elements from this list.
@@ -279,128 +287,25 @@ sealed abstract class List[+A] extends Stream[A]
     (b.toList, these)
   }
 
-  /** Returns the list resulting from applying the given function <code>f</code> to each
-   *  element of this list.
-   *
-   *  @param f function to apply to each element.
-   *  @return <code>[f(a0), ..., f(an)]</code> if this list is <code>[a0, ..., an]</code>.
-   */
-  final override def map[B](f: A => B): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      b += f(these.head)
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Returns all the elements of this list that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *  It is guarenteed that the receiver list itself is returned iff all its
-   *  elements satisfy the predicate `p'. Hence the following equality is valid:
-   *
-   *  (xs filter p) eq xs  ==  xs forall p
-   *
-   *  @param p the predicate used to filter the list.
-   *  @return the elements of this list satisfying <code>p</code>.
+  /** A list consisting of all elements of this list in reverse order.
    */
-  final override def filter(p: A => Boolean): List[A] = {
-    // return same list if all elements satisfy p
+  override def reverse: List[A] = {
+    var result: List[A] = Nil
     var these = this
-    var allTrue = true
-    val b = new ListBuffer[A]
     while (!these.isEmpty) {
-      if (p(these.head)) b += these.head
-      else allTrue = false
+      result = these.head :: result
       these = these.tail
     }
-    if (allTrue) this else b.toList
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this list, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this list is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  final override def flatMap[B](f: A => Iterable[B]): List[B] = {
-    val b = new ListBuffer[B]
-    var these = this
-    while (!these.isEmpty) {
-      b ++= f(these.head)
-      these = these.tail
-    }
-    b.toList
-  }
-
-  /** Returns a list formed from this list and the specified list
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two lists is longer than the other, its remaining elements are ignored.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @return     <code>List((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *              (a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>))</code> when
-   *              <code>List(a<sub>0</sub>, ..., a<sub>m</sub>)
-   *              zip List(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
-   */
-  def zip[B](that: List[B]): List[(A, B)] = {
-    val b = new ListBuffer[(A, B)]
-    var these = this
-    var those = that
-    while (!these.isEmpty && !those.isEmpty) {
-      b += ((these.head, those.head))
-      these = these.tail
-      those = those.tail
-    }
-    b.toList
-  }
-
-  /** Returns a list formed from this list and the specified list
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *
-   *  @param that     list <code>that</code> may have a different length
-   *                  as the self list.
-   *  @param thisElem element <code>thisElem</code> is used to fill up the
-   *                  resulting list if the self list is shorter than
-   *                  <code>that</code>
-   *  @param thatElem element <code>thatElem</code> is used to fill up the
-   *                  resulting list if <code>that</code> is shorter than
-   *                  the self list
-   *  @return         <code>List((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
-   *                  ..., {elem,b<sub>m</sub>})</code>
-   *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
-   *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
-   *                  invoked where <code>m &gt; n</code>.
-   */
-  def zipAll[B, C >: A, D >: B](that: List[B], thisElem: C, thatElem: D): List[(C, D)] = {
-    val b = new ListBuffer[(C, D)]
-    var these = this
-    var those = that
-    while (!these.isEmpty && !those.isEmpty) {
-      b += ((these.head, those.head))
-      these = these.tail
-      those = those.tail
-    }
-    while (!these.isEmpty) {
-      b += ((these.head, thatElem))
-      these = these.tail
-    }
-    while (!those.isEmpty) {
-      b += ((thisElem, those.head))
-      those = those.tail
-    }
-    b.toList
+    result
   }
 
   override def stringPrefix = "List"
 
-  override def toStream : Stream[A] = this
+  override def toStream : Stream[A] =
+    if (isEmpty) Stream.Empty
+    else new Stream.Cons(head, tail.toStream)
+
+  // !!! todo: work in patch
 
   /** Computes the difference between this list and the given list
    *  <code>that</code>.
@@ -424,7 +329,7 @@ sealed abstract class List[+A] extends Stream[A]
    *  <code>x</code>.
    *
    *  @param x    the object to remove from this list.
-   *  @return     this list without the elements of the given object
+   *  @return     this list without occurrences of the given object
    *              <code>x</code>.
    *  @deprecated use diff instead
    */
@@ -532,6 +437,10 @@ case object Nil extends List[Nothing] {
     throw new NoSuchElementException("head of empty list")
   override def tail: List[Nothing] =
     throw new NoSuchElementException("tail of empty list")
+  override def equals(that: Any) = that match {
+    case that1: Sequence[_] => that1.isEmpty
+    case _ => false
+  }
 }
 
 /** A non empty list characterized by a head and a tail.
@@ -540,7 +449,7 @@ case object Nil extends List[Nothing] {
  *  @version 1.0, 15/07/2003
  */
 @SerialVersionUID(0L - 8476791151983527571L)
-final case class ::[B](private var hd: B, private[scalax] var tl: List[B]) extends List[B] {
+final case class ::[B](private var hd: B, private[scala] var tl: List[B]) extends List[B] {
   override def head : B = hd
   override def tail : List[B] = tl
   override def isEmpty: Boolean = false
@@ -572,16 +481,20 @@ final case class ::[B](private var hd: B, private[scalax] var tl: List[B]) exten
 /** This object provides methods for creating specialized lists, and for
  *  transforming special kinds of lists (e.g. lists of lists).
  *
- *  @author  Martin Odersky and others
- *  @version 1.0, 15/07/2003
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
-object List extends SequenceFactory[List] with EmptyIterableFactory[List] {
+object List extends SequenceFactory[List] {
+
+  import collection.{Iterable, Sequence, Vector}
 
-  override val empty: List[Nothing] = Nil
+  type Coll = List[_]
+  implicit def builderFactory[A]: BuilderFactory[A, List[A], Coll] = new BuilderFactory[A, List[A], Coll] { def apply(from: Coll) = new ListBuffer[A] }
+  def newBuilder[A]: Builder[A, List[A], Any] = new ListBuffer[A]
 
-  override def apply[A](xs: A*) = xs.asInstanceOf[Iterable[A]].toList // !@!
+  override def empty[A]: List[A] = Nil
 
-  override def newBuilder[B]: Builder[List, B] = new ListBuffer[B]
+  override def apply[A](xs: A*): List[A] = Iterable.fromOld(xs).toList
 
   /** Create a sorted list with element values
    * <code>v<sub>n+1</sub> = step(v<sub>n</sub>)</code>
@@ -772,7 +685,7 @@ object List extends SequenceFactory[List] with EmptyIterableFactory[List] {
    *  @deprecated use <code>str.toList</code> instead
    */
   @deprecated def fromString(str: String): List[Char] =
-    str.toList.asInstanceOf[List[Char]] // !@!
+    Iterable.fromOld(str).toList
 
   /** Returns the given list of characters as a string.
    *
@@ -948,5 +861,5 @@ object List extends SequenceFactory[List] with EmptyIterableFactory[List] {
 
 /** Only used for list serialization */
 @SerialVersionUID(0L - 8476791151975527571L)
-private[scalax] case object ListSerializeEnd
+private[scala] case object ListSerializeEnd
 
diff --git a/src/library/scala/collection/immutable/ListMap.scala b/src/library/scala/collection/immutable/ListMap.scala
index ba31ab906a..67fb8f2a25 100644
--- a/src/library/scala/collection/immutable/ListMap.scala
+++ b/src/library/scala/collection/immutable/ListMap.scala
@@ -12,21 +12,14 @@
 
 package scala.collection.immutable
 
-/** The canonical factory of <a href="ListMap.html">ListMap</a>'s */
-object ListMap {
-
-  /** The empty map of this type
-   *  @deprecated   use <code>empty</code> instead
-   */
-  @deprecated
-  def Empty[A, B] = new ListMap[A, B]
+import generic._
 
-  /** The empty map of this type */
-  def empty[A, B] = new ListMap[A, B]
+/** The canonical factory of <a href="ListMap.html">ListMap</a>'s */
+object ListMap extends ImmutableMapFactory[ListMap] {
 
-  /** The canonical factory for this type
-   */
-  def apply[A, B](elems: (A, B)*) = empty[A, B] ++ elems
+  type Coll = ListMap[_,_]
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), ListMap[A, B], Coll] = new BuilderFactory[(A, B), ListMap[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
+  def empty[A, B]: ListMap[A, B] = new ListMap
 }
 
 /** This class implements immutable maps using a list-based data
@@ -39,18 +32,16 @@ object ListMap {
  *  @version 2.0, 01/01/2007
  */
 @serializable
-class ListMap[A, +B] extends Map[A, B] {
+class ListMap[A, +B] extends Map[A, B] with ImmutableMapTemplate[A, B, ListMap[A, B]] {
 
-  /** Returns a <code>new ListMap</code> instance mapping keys of the
-   *  same type to values of type <code>C</code>.
-   */
-  def empty[C] = ListMap.empty[A, C]
+  override def empty = ListMap.empty
+  override def mapBuilder[A, B]: Builder[(A, B), ListMap[A, B], Any] = ListMap.newBuilder[A, B]
 
   /** Returns the number of mappings in this map.
    *
    *  @return number of mappings in this map.
    */
-  def size: Int = 0
+  override def size: Int = 0
 
   /** Checks if this map maps <code>key</code> to a value and return the
    *  value if it exists.
@@ -69,7 +60,24 @@ class ListMap[A, +B] extends Map[A, B] {
    *  @param key  the key element of the updated entry.
    *  @param value the value element of the updated entry.
    */
-  def update [B1 >: B](key: A, value: B1): ListMap[A, B1] = new Node(key, value)
+  def add [B1 >: B] (key: A, value: B1): ListMap[A, B1] = new Node[B1](key, value)
+
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
+   */
+  override def + [B1 >: B] (kv: (A, B1)): ListMap[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): ListMap[A, B1] =
+    this + elem1 + elem2 ++ collection.Iterable.fromOld(elems)
 
   /** This creates a new mapping without the given <code>key</code>.
    *  If the map does not contain a mapping for the given key, the
@@ -136,9 +144,9 @@ class ListMap[A, +B] extends Map[A, B] {
      *  @param k ...
      *  @param v ...
      */
-    override def update [B2 >: B1](k: A, v: B2): ListMap[A, B2] = {
+    override def add [B2 >: B1](k: A, v: B2): ListMap[A, B2] = {
       val m = if (contains(k)) this - k else this
-      new m.Node(k, v)
+      new m.Node[B2](k, v)
     }
 
     /** Creates a new mapping without the given <code>key</code>.
@@ -157,6 +165,6 @@ class ListMap[A, +B] extends Map[A, B] {
         else new tail.Node(key, value)
       }
 
-    override protected def next: ListMap[A,B1] = ListMap.this
+    override protected def next: ListMap[A, B1] = ListMap.this
   }
 }
diff --git a/src/library/scala/collection/immutable/ListSet.scala b/src/library/scala/collection/immutable/ListSet.scala
index 35ead05b63..bf56a76f72 100644
--- a/src/library/scala/collection/immutable/ListSet.scala
+++ b/src/library/scala/collection/immutable/ListSet.scala
@@ -11,25 +11,13 @@
 
 package scala.collection.immutable
 
-
-//import Predef.NoSuchElementException
+import generic._
 
 /** The canonical factory of <a href="ListSet.html">ListSet</a>'s */
-object ListSet {
-
-  /** constructs an empty ListSet
-   *  @deprecated   use <code>empty</code> instead
-   */
-  @deprecated
-  def Empty[A] = new ListSet[A]
-
-  /** The empty set of this type.
-   */
+object ListSet extends SetFactory[ListSet] {
+  type Coll = ListSet[_]
+  implicit def builderFactory[A]: BuilderFactory[A, ListSet[A], Coll] = new BuilderFactory[A, ListSet[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
   def empty[A] = new ListSet[A]
-
-  /** The canonical factory for this type
-   */
-  def apply[A, B](elems: A*) = empty[A] ++ elems
 }
 
 
@@ -42,17 +30,18 @@ object ListSet {
  *  @version 1.0, 09/07/2003
  */
 @serializable
-class ListSet[A] extends AnyRef with Set[A] {
+class ListSet[A] extends Set[A] with SetTemplate[A, ListSet[A]] { self =>
 
   /** Returns the number of elements in this set.
    *
    *  @return number of set elements.
    */
-  def size: Int = 0
+  override def size: Int = 0
 
   override def isEmpty: Boolean = true;
 
-  def empty[B] = ListSet.empty[B]
+  override def empty = ListSet.empty
+  override def traversibleBuilder[B]: Builder[B, ListSet[B], Any] = ListSet.newBuilder[B]
 
   /** Checks if this set contains element <code>elem</code>.
    *
@@ -76,24 +65,13 @@ class ListSet[A] extends AnyRef with Set[A] {
    *  @return the new iterator
    */
   def elements: Iterator[A] = new Iterator[A] {
-    var that: ListSet[A] = ListSet.this;
+    var that: ListSet[A] = self;
     def hasNext = !that.isEmpty;
     def next: A =
       if (!hasNext) throw new NoSuchElementException("next on empty iterator")
       else { val res = that.elem; that = that.next; res }
   }
 
-  /** Compares two sets for equality.
-   *   Two set are equal iff they contain the same elements.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case _: scala.collection.Set[_] =>
-      val that = obj.asInstanceOf[scala.collection.Set[A]]
-      (size == that.size) && (toList forall that.contains)
-    case _ =>
-      false
-  }
-
   /**
    *  @throws Predef.NoSuchElementException
    */
@@ -106,11 +84,12 @@ class ListSet[A] extends AnyRef with Set[A] {
 
   @serializable
   protected class Node(override protected val elem: A) extends ListSet[A] {
+
     /** Returns the number of elements in this set.
      *
      *  @return number of set elements.
      */
-    override def size = ListSet.this.size + 1
+    override def size = self.size + 1
 
     /** Checks if this set is empty.
      *
@@ -123,7 +102,7 @@ class ListSet[A] extends AnyRef with Set[A] {
      *  @param  elem    the element to check for membership.
      *  @return true, iff <code>elem</code> is contained in this set.
      */
-    override def contains(e: A) = (e == elem) || ListSet.this.contains(e)
+    override def contains(e: A) = (e == elem) || self.contains(e)
 
     /** This method creates a new set with an additional element.
      */
@@ -132,11 +111,11 @@ class ListSet[A] extends AnyRef with Set[A] {
     /** <code>-</code> can be used to remove a single element from
      *  a set.
      */
-    override def -(e: A): ListSet[A] = if (e == elem) ListSet.this else {
-      val tail = ListSet.this - e; new tail.Node(elem)
+    override def -(e: A): ListSet[A] = if (e == elem) self else {
+      val tail = self - e; new tail.Node(elem)
     }
 
-    override protected def next: ListSet[A] = ListSet.this
+    override protected def next: ListSet[A] = self
 
     override def stringPrefix = "Set"
   }
diff --git a/src/library/scala/collection/immutable/LongMap.scala b/src/library/scala/collection/immutable/LongMap.scala
index 298d7c4e82..043fe2e882 100644
--- a/src/library/scala/collection/immutable/LongMap.scala
+++ b/src/library/scala/collection/immutable/LongMap.scala
@@ -43,7 +43,7 @@ object LongMap{
   def empty[T] : LongMap[T]  = LongMap.Nil;
   def singleton[T](key : Long, value : T) : LongMap[T] = LongMap.Tip(key, value);
   def apply[T](elems : (Long, T)*) : LongMap[T] =
-    elems.foldLeft(empty[T])((x, y) => x.update(y._1, y._2));
+    elems.foldLeft(empty[T])((x, y) => x.add(y._1, y._2));
 
 
   private[immutable] case object Nil extends LongMap[Nothing]{
@@ -134,8 +134,8 @@ import LongMap._;
  * <a href="http://citeseer.ist.psu.edu/okasaki98fast.html">Fast Mergeable Long Maps</a>
  * by Okasaki and Gill. Essentially a trie based on binary digits of the the integers.
  */
-sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T]{
-  def empty[S] : LongMap[S] = LongMap.Nil;
+sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T] with scala.collection.generic.ImmutableMapTemplate[Long, T, LongMap[T]] {
+  override def empty: LongMap[T] = LongMap.Nil;
 
   override def toList = {
     val buffer = new scala.collection.mutable.ListBuffer[(Long, T)];
@@ -210,13 +210,13 @@ sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T
     case LongMap.Nil => LongMap.Nil;
   }
 
-  override def transform[S](f : (Long, T) => S) : LongMap[S] = this match {
+  def transform[S](f : (Long, T) => S) : LongMap[S] = this match {
     case b@LongMap.Bin(prefix, mask, left, right) => b.bin(left.transform(f), right.transform(f));
     case t@LongMap.Tip(key, value) => t.withValue(f(key, value));
     case LongMap.Nil => LongMap.Nil;
   }
 
-  final def size : Int = this match {
+  final override def size : Int = this match {
     case LongMap.Nil => 0;
     case LongMap.Tip(_, _) => 1;
     case LongMap.Bin(_, _, left, right) => left.size + right.size;
@@ -240,7 +240,7 @@ sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T
     case LongMap.Nil => error("key not found");
   }
 
-  def update[S >: T](key : Long, value : S) : LongMap[S] = this match {
+  def add[S >: T](key : Long, value : S) : LongMap[S] = this match {
     case LongMap.Bin(prefix, mask, left, right) => if (!hasMatch(key, prefix, mask)) join(key, LongMap.Tip(key, value), prefix, this);
                                           else if (zero(key, mask)) LongMap.Bin(prefix, mask, left.update(key, value), right)
                                           else LongMap.Bin(prefix, mask, left, right.update(key, value));
@@ -249,6 +249,9 @@ sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T
     case LongMap.Nil => LongMap.Tip(key, value);
   }
 
+  /** @deprecated use add instead */
+  @deprecated override def update[S >: T](key: Long, value: S): LongMap[S] = add(key, value)
+
   /**
    * Updates the map, using the provided function to resolve conflicts if the key is already present.
    * Equivalent to
@@ -371,9 +374,7 @@ sealed abstract class LongMap[+T] extends scala.collection.immutable.Map[Long, T
    */
   def intersection[R](that : LongMap[R]) : LongMap[T] = this.intersectionWith(that, (key : Long, value : T, value2 : R) => value);
 
-  override def ++[S >: T](that : Iterable[(Long, S)]) = that match {
-    case (that : LongMap[_]) => this.unionWith[S](that.asInstanceOf[LongMap[S]], (key, x, y) => y);
-    case that => that.foldLeft(this : LongMap[S])({case (m, (x, y)) => m.update(x, y)});
-  }
+  def ++[S >: T](that : LongMap[S]) =
+    this.unionWith[S](that, (key, x, y) => y)
 }
 
diff --git a/src/library/scala/collection/immutable/Map.scala b/src/library/scala/collection/immutable/Map.scala
index 0fa41a7f3b..442a325637 100644
--- a/src/library/scala/collection/immutable/Map.scala
+++ b/src/library/scala/collection/immutable/Map.scala
@@ -11,241 +11,66 @@
 
 package scala.collection.immutable
 
-import Predef._
+import generic._
 
-/** <p>An object for creating immutable maps. These are implemented using
-  *         <a href="HashMap.html">immutable hash maps</a>.
-  *  </p>*/
-object Map {
-  def empty[A, B]: Map[A, B] = new EmptyMap[A, B]
+trait Map[A, +B] extends Iterable[(A, B)]
+                    with collection.Map[A, B]
+                    with ImmutableMapTemplate[A, B, Map[A, B]] { self =>
 
-  def apply[A, B](elems: (A, B)*) = empty[A, B] ++ elems
-}
-
-/** <p>
- *    This class defines the interface for immutable maps.  Operations
- *    on an immutable map leave the original map unchanged, and return
- *    a new map if needed.
- *  </p>
- *  <p>
- *    Concrete map implementations have to provide functionality for
- *    the abstract methods in <a href="../Map.html" target="contentFrame">
- *    <code>scala.collection.Map</code></a> as well as for
- *    <code>factory</code>, <code>update</code>, and <code>-</code>.
- *  </p>
- *
- *  @author  Matthias Zenger
- *  @author  Erik Stenman
- *  @author  Martin Odersky
- *  @version 1.2, 31/06/2006
- */
-trait Map[A, +B] extends collection.Map[A, B] {
-
-  /** This method returns a new map instance of the same class
-   *  mapping keys of the same type to values of type <code>C</code>.
-   */
-  def empty[C]: Map[A, C]
-
-  /** This method allows one to create a new map with an
-   *  additional mapping from <code>key</code>
-   *  to <code>value</code>. If the map contains already a
-   *  mapping for <code>key</code>, it will be overridden by this
-   *  function.
-   *
-   *  @param key   ...
-   *  @param value ...
-   *  @return      the created map
-   *  @deprecated    use <code>+({A, B})</code> instead
-   */
-  def update [B1 >: B] (key: A, value: B1): Map[A, B1]
+  override def empty: Map[A, B] = Map.empty
+  override def mapBuilder[A, B]: Builder[(A, B), Map[A, B], Any] = Map.newBuilder[A, B]
 
   /** Add a key/value pair to this map.
-   *  @param    kv the key/value pair.
+   *  @param    key the key
+   *  @param    value the value
    *  @return   A new map with the new binding added to this map
    */
-  def + [B1 >: B] (kv: (A, B1)): Map[A, B1] = update(kv._1, kv._2)
+  def add [B1 >: B](key: A, value: B1): Map[A, B1]
 
-  /** Add two or more key/value pairs to this map.
-   *  @param    kv1 the first key/value pair.
-   *  @param    kv2 the second key/value pair.
-   *  @param    kvs the remaining key/value pairs.
-   *  @return   A new map with the new bindings added
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
    */
-  def + [B1 >: B] (kv1: (A, B1), kv2: (A, B1), kvs: (A, B1)*): Map[A, B1] =
-    this + kv1 + kv2 ++ kvs
+  override def + [B1 >: B] (kv: (A, B1)): Map[A, B1] = add(kv._1, kv._2)
 
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterable object containing all key/value pairs.
-   *  @return   A new map with the new bindings added
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
    */
-  def ++ [B1 >: B] (kvs: Iterable[(A, B1)]): Map[A, B1] =
-    ((this: Map[A, B1]) /: kvs) ((m, kv) => m + kv)
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): Map[A, B1] =
+    this + elem1 + elem2 ++ collection.Iterable.fromOld(elems)
 
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterator containing all key/value pairs.
-   *  @return   A new map with the new bindings added
-   */
-  def ++ [B1 >: B] (kvs: Iterator[(A, B1)]): Map[A, B1] =
-    ((this: Map[A, B1]) /: kvs) ((m, kv) => m + kv)
-
-  /** Remove a key from this map
-   *  @param    key the key to be removed
-   *  @return   If the map does not contain a binding for <code>key</code>
-   *            it is returned unchanged. Otherwise, return a new map
-   *            without a binding for <code>key</code>
-   */
-  def - (key: A): Map[A, B]
-
-  /** Remove two or more keys from this map
-   *  @param    key1 the first key to be removed
-   *  @param    key2 the second key to be removed
-   *  @param    keys the remaining keys to be removed
-   *  @return   A map without bindings for <code>keys</code>
-   *            If the map is mutable, the bindings are removed in place
-   *            and the map itself is returned.
-   *            If the map is immutable, a new map with the bindings removed is returned.
+  /** A hash method compatible with <code>equals</code>
    */
-  def - (key1: A, key2: A, keys: A*): Map[A, B] =
-    this - key1 - key2 -- keys
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   *  @return   A map without bindings for the given keys.
-   *            If the map is mutable, the bindings are removed in place
-   *            and the map itself is returned.
-   *            If the map is immutable, a new map with the bindings removed is returned.
-   */
-  def -- (keys: Iterable[A]): Map[A, B] = this -- keys.elements
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   *  @return   A map without bindings for the given keys.
-   *            If the map is mutable, the bindings are removed in place
-   *            and the map itself is returned.
-   *            If the map is immutable, a new map with the bindings removed is returned.
-   */
-  def -- (keys: Iterator[A]): Map[A, B] =
-    (this /: keys) ((m, key) => m - key)
-
+  override def hashCode() =
+    (Map.hashSeed /: this) (_ * 41 + _.hashCode)
 
   /** The same map with a given default function */
-  def withDefault[B1 >: B](d: A => B1): Map[A, B1] = new Map[A, B1] {
-    def size = Map.this.size
-    def get(key: A) = Map.this.get(key)
-    def elements = Map.this.elements
-    def empty[C] = Map.this.empty
-    def update [B2 >: B1](key: A, value: B2): Map[A, B2] =
-      Map.this.update(key, value) withDefault d
-    def -(key: A): Map[A, B1] = Map.this - key withDefault d
-    override def default(key: A): B1 = d(key)
-  }
+  def withDefault[B1 >: B](d: A => B1): Map[A, B1] = new Map.WithDefault[A, B1](this, d)
 
   /** The same map with a given default value */
-  def withDefaultValue[B1 >: B](d: B1): Map[A, B1] = withDefault(x => d)
-
-  /** This function transforms all the values of mappings contained
-   *  in this map with function <code>f</code>.
-   *
-   *  @param f A function over keys and values
-   *  @return  the updated map
-   */
-  def transform[C](f: (A, B) => C): Map[A, C] = {
-    var res = empty[C]
-    foreach { case (key, value) => res = res.update(key, f(key, value)) }
-    res
-  }
-
-  /** This method removes all the mappings for which the predicate
-   *  <code>p</code> returns <code>false</code>.
-   *
-   *  @param p A prediacte over key-value pairs
-   *  @return  the updated map
-   */
-  override def filter(p: ((A, B)) => Boolean): Map[A, B] = {
-    var res = this
-    foreach {
-      case kv @ (key, _) => if (!p(kv)) { res = res - key }
-    }
-    res
-  }
-
-  /** <p>
-   *    This method defines syntactic sugar for adding a
-   *    mapping. It is typically used in the following way:
-   *  </p>
-   *  <pre>
-   *    map + key -> value
-   *  </pre>
-   *  @deprecated  use <code>+({A, B})</code> instead
-   */
-  @deprecated def +(key: A): MapTo = new MapTo(key)
-
-  /** <code>incl</code> can be used to add many mappings at the same time
-   *  to the map. The method assumes that a mapping is represented
-   *  by a <code>Pair</code> object who's first component denotes the
-   *  key, and who's second component refers to the value.
-   *
-   *  @param mappings ...
-   *  @return         ...
-   *  @deprecated   use <code>+</code> instead
-   */
-  @deprecated def incl[B1 >: B](mappings: (A, B1)*): Map[A, B1] = incl(mappings)
-
-  /** <code>incl</code> can be used to add many mappings at the same time
-   *  to the map. The method assumes that each mapping is represented
-   *  by an Iterator over <code>Pair</code> objects who's first component
-   *  denotes the key, and who's second component refers to the value.
-   *
-   *  @deprecated    use <code>++</code> instead
-   */
-  @deprecated def incl[B1 >: B](map: Iterable[(A, B1)]): Map[A, B1] = {
-    val iter = map.elements
-    var res: Map[A, B1] = this
-    while (iter.hasNext) {
-      val (key, value) = iter.next
-      res = res.update(key, value)
-    }
-    res
-  }
-
-  /** This method will return a map where all the mappings
-   *  for the given sequence of keys are removed from the map.
-   *
-   *  @param keys ...
-   *  @return     the updated map
-   *  @deprecated    use <code>-</code> instead
-   */
-  @deprecated def excl(keys: A*): Map[A, B] = excl(keys)
-
-  /** This method removes all the mappings for keys provided by an
-   *  iterator over the elements of the <code>keys</code> object.
-   *
-   *  @param keys ...
-   *  @return     the updated map
-   *  @deprecated    use <code>--</code> instead
-   */
-  @deprecated def excl(keys: Iterable[A]): Map[A, B] = {
-    val iter = keys.elements
-    var res = this
-    while (iter.hasNext) {
-      res = res - iter.next
-    }
-    res
-  }
-
-  /** This method controls how a mapping is represented in the string
-   *  representation provided by method <code>toString</code>.
-   *
-   *  @param p ...
-   *  @return  the string representation of a map entry
-   */
-  @deprecated def mappingToString[B1 >: B](p: (A, B1)) =
-    p._1.toString() + " -> " + p._2
+  def withDefaultValue[B1 >: B](d: B1): Map[A, B1] = new Map.WithDefault[A, B1](this, x => d)
+}
 
-  /** @deprecated    use <code>+({A, B})</code> instead
-   */
-  @deprecated class MapTo(key: A) {
-    def -> [B1 >: B](value: B1) = update(key, value)
+object Map extends ImmutableMapFactory[Map] {
+  private val hashSeed = "Map".hashCode
+  type Coll = Map[_, _]
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), Map[A, B], Coll] = new BuilderFactory[(A, B), Map[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
+
+  def empty[A, B]: Map[A, B] = FlexMap.empty
+
+  class WithDefault[A, +B](underlying: Map[A, B], d: A => B) extends Map[A, B] {
+    override def size = underlying.size
+    def get(key: A) = underlying.get(key)
+    def elements = underlying.elements
+    override def empty = new WithDefault(underlying.empty, d)
+    def add[B1 >: B](key: A, value: B1): WithDefault[A, B1] = new WithDefault[A, B1](underlying.add[B1](key, value), d)
+    def - (key: A): WithDefault[A, B] = new WithDefault(underlying - key, d)
+    override def default(key: A): B = d(key)
   }
 }
 
diff --git a/src/library/scala/collection/immutable/Map1.scala b/src/library/scala/collection/immutable/Map1.scala
deleted file mode 100644
index 7fc1144da3..0000000000
--- a/src/library/scala/collection/immutable/Map1.scala
+++ /dev/null
@@ -1,43 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-import Predef.Pair
-
-/** This class implements immutable maps with exactly one entry
- *
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map1[A, +B](key1: A, value1: B) extends Map[A, B] {
-
-  def size = 1
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1) else None
-
-  def elements = Iterator.single((key1, value1))
-
-  def empty[B]: Map[A, B] = new EmptyMap[A, B]
-
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
-    if (key == key1) new Map1(key1, value)
-    else new Map2(key1, value1, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1) empty else this
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Map2.scala b/src/library/scala/collection/immutable/Map2.scala
deleted file mode 100644
index 2c97d0a3c3..0000000000
--- a/src/library/scala/collection/immutable/Map2.scala
+++ /dev/null
@@ -1,48 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-import Predef.Pair
-
-/** This class implements immutable maps with exactly two entries
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map2[A, +B](key1: A, value1: B, key2: A, value2: B) extends Map[A, B] {
-
-  def size = 2
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else None
-
-  def elements = Iterator.fromValues(
-    (key1, value1), (key2, value2))
-
-  def empty[C]: Map[A, C] = new EmptyMap[A, C]
-
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
-    if (key == key1) new Map2(key1, value, key2, value2)
-    else if (key == key2) new Map2(key1, value1, key2, value)
-    else new Map3(key1, value1, key2, value2, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1) new Map1(key2, value2)
-    else if (key == key2) new Map1(key1, value1)
-    else this
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Map3.scala b/src/library/scala/collection/immutable/Map3.scala
deleted file mode 100644
index c8e6b470d8..0000000000
--- a/src/library/scala/collection/immutable/Map3.scala
+++ /dev/null
@@ -1,51 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-import Predef.Pair
-
-/** This class implements immutable maps with exactly three entries
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map3[A, +B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B) extends Map[A, B] {
-
-  def size = 3
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else if (key == key3) Some(value3)
-    else None
-
-  def elements = Iterator.fromValues(
-    (key1, value1), (key2, value2), (key3, value3))
-
-  def empty[C]: Map[A, C] = new EmptyMap[A, C]
-
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
-    if (key == key1) new Map3(key1, value, key2, value2, key3, value3)
-    else if (key == key2) new Map3(key1, value1, key2, value, key3, value3)
-    else if (key == key3) new Map3(key1, value1, key2, value2, key3, value)
-    else new Map4(key1, value1, key2, value2, key3, value3, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1) new Map2(key2, value2, key3, value3)
-    else if (key == key2) new Map2(key1, value1, key3, value3)
-    else if (key == key3) new Map2(key1, value1, key2, value2)
-    else this
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Map4.scala b/src/library/scala/collection/immutable/Map4.scala
deleted file mode 100644
index cb8bf9f8eb..0000000000
--- a/src/library/scala/collection/immutable/Map4.scala
+++ /dev/null
@@ -1,52 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.immutable
-
-import Predef._
-
-/** This class implements immutable maps with exactly four entries
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map4[A, +B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B, key4: A, value4: B) extends Map[A, B] {
-
-  def size = 4
-
-  def get(key: A): Option[B] =
-    if      (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else if (key == key3) Some(value3)
-    else if (key == key4) Some(value4)
-    else None
-
-  def elements = Iterator.fromValues(
-    (key1, value1), (key2, value2), (key3, value3), (key4, value4))
-
-  def empty[C]: Map[A, C] = new EmptyMap[A, C]
-
-  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
-    if      (key == key1) new Map4(key1, value, key2, value2, key3, value3, key4, value4)
-    else if (key == key2) new Map4(key1, value1, key2, value, key3, value3, key4, value4)
-    else if (key == key3) new Map4(key1, value1, key2, value2, key3, value, key4, value4)
-    else if (key == key4) new Map4(key1, value1, key2, value2, key3, value3, key4, value)
-    else HashMap(key1 -> value1, key2 -> value2, key3 -> value3, key4 -> value4, key -> value)
-
-  def - (key: A): Map[A, B] =
-    if      (key == key1) new Map3(key2, value2, key3, value3, key4, value4)
-    else if (key == key2) new Map3(key1, value1, key3, value3, key4, value4)
-    else if (key == key3) new Map3(key1, value1, key2, value2, key4, value4)
-    else if (key == key4) new Map3(key1, value1, key2, value2, key3, value3)
-    else this
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/PagedSeq.scala b/src/library/scala/collection/immutable/PagedSeq.scala
index c8d38e6b76..c63336f2da 100644
--- a/src/library/scala/collection/immutable/PagedSeq.scala
+++ b/src/library/scala/collection/immutable/PagedSeq.scala
@@ -163,7 +163,7 @@ class PagedSeq[T] protected (more: (Array[T], Int, Int) => Int,
   /** the subsequence from index `start' up to and excluding
    *  the minimum of index `end' and the length of the current sequence.
    */
-  override def slice(_start: Int, _end: Int) = {
+  override def slice(_start: Int, _end: Int): PagedSeq[T] = {
     page(start)
     val s = start + _start
     val e = if (_end == UndeterminedEnd) _end else start + _end
diff --git a/src/library/scala/collection/immutable/Queue.scala b/src/library/scala/collection/immutable/Queue.scala
index 1161c5b7fc..f7d2da9a09 100644
--- a/src/library/scala/collection/immutable/Queue.scala
+++ b/src/library/scala/collection/immutable/Queue.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -178,3 +179,4 @@ class Queue[+A](elem: A*) extends Seq[A] {
       q._1.hashCode() + q._2.hashCode()
     }
 }
+*/
diff --git a/src/library/scala/collection/immutable/RedBlack.scala b/src/library/scala/collection/immutable/RedBlack.scala
index 9db5e0a4ca..efe85a12b1 100644
--- a/src/library/scala/collection/immutable/RedBlack.scala
+++ b/src/library/scala/collection/immutable/RedBlack.scala
@@ -28,10 +28,11 @@ abstract class RedBlack[A] {
     def lookup(x: A): Tree[B]
     def update[B1 >: B](k: A, v: B1): Tree[B1] = blacken(upd(k, v))
     def delete(k: A): Tree[B] = del(k)
-
-    def visit[T](input : T)(f : (T,A,B) => Tuple2[Boolean,T]) : Tuple2[Boolean,T];
-    def elements : ImmutableIterator[Pair[A,B]];
-    def elementsSlow: Iterator[Pair[A, B]];
+    def foreach(f: (A, B) => Unit)
+    /** @deprecated use foreach instead */
+    @deprecated def visit[T](input : T)(f : (T,A,B) => Tuple2[Boolean,T]) : Tuple2[Boolean,T];
+    def toStream: Stream[(A,B)]
+    def elements: Iterator[Pair[A, B]]
     def upd[B1 >: B](k: A, v: B1): Tree[B1]
     def del(k: A): Tree[B]
     def smallest: NonEmpty[B]
@@ -83,12 +84,20 @@ abstract class RedBlack[A] {
       }
     }
     def smallest: NonEmpty[B] = if (left.isEmpty) this else left.smallest
-    def elements : ImmutableIterator[Pair[A,B]] =
-      left.elements.append(Pair(key,value), () => right.elements)
+    def toStream: Stream[(A,B)] =
+      left.toStream append Stream((key,value)) append right.toStream
+
+    def elements: Iterator[Pair[A, B]] =
+      left.elements append Iterator.single(Pair(key, value)) append right.elements
 
-    def elementsSlow: Iterator[Pair[A, B]] =
-      left.elementsSlow append Iterator.single(Pair(key, value)) append right.elementsSlow
+    def foreach(f: (A, B) => Unit) {
+      left foreach f
+      f(key, value)
+      right foreach f
+    }
 
+    /** @deprecated use foreach instead */
+    @deprecated
     def visit[T](input : T)(f : (T,A,B) => Tuple2[Boolean,T]) : Tuple2[Boolean,T] = {
       val left = this.left.visit(input)(f)
       if (!left._1) return left
@@ -120,8 +129,13 @@ abstract class RedBlack[A] {
     def upd[B](k: A, v: B): Tree[B] = RedTree(k, v, Empty, Empty)
     def del(k: A): Tree[Nothing] = this
     def smallest: NonEmpty[Nothing] = throw new NoSuchElementException("empty map")
-    def elementsSlow: Iterator[Pair[A, Nothing]] = Iterator.empty
-    def elements : ImmutableIterator[Pair[A,Nothing]] = ImmutableIterator.empty
+    def elements: Iterator[Pair[A, Nothing]] = Iterator.empty
+    def toStream: Stream[(A,Nothing)] = Stream.empty
+
+    def foreach(f: (A, Nothing) => Unit) {}
+
+    /** @deprecated use foreach instead */
+    @deprecated
     def visit[T](input : T)(f : (T,A,Nothing) => Tuple2[Boolean,T]) = Tuple2(true,input)
 
     def range(from : Option[A], until : Option[A]) = this
diff --git a/src/library/scala/collection/immutable/Sequence.scala b/src/library/scala/collection/immutable/Sequence.scala
new file mode 100755
index 0000000000..5265912e11
--- /dev/null
+++ b/src/library/scala/collection/immutable/Sequence.scala
@@ -0,0 +1,26 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.immutable
+
+import generic._
+
+/** A subtrait of collection.Sequence which represents sequences
+ *  that cannot be mutated.
+ */
+trait Sequence[+A] extends Iterable[A] with collection.Sequence[A] with SequenceTemplate[A, Sequence[A]] {
+  override protected[this] def newBuilder = Sequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Sequence[B], Any] = Sequence.newBuilder[B]
+  override def hashCode = (Sequence.hashSeed /: this)(_ * 41 + _.hashCode)
+}
+
+object Sequence extends SequenceFactory[Sequence] {
+  private val hashSeed = "Sequence".hashCode
+  type Coll = Sequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Sequence[A], Coll] = new BuilderFactory[A, Sequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Sequence[A], Any] = new mutable.ListBuffer
+}
diff --git a/src/library/scala/collection/immutable/Set.scala b/src/library/scala/collection/immutable/Set.scala
index 474e541f65..5819d38e03 100644
--- a/src/library/scala/collection/immutable/Set.scala
+++ b/src/library/scala/collection/immutable/Set.scala
@@ -11,177 +11,23 @@
 
 package scala.collection.immutable
 
+import generic._
 
-/** Canonical factories for immutable sets.  The canonical immutable sets are
-  *  currently implemented using <a href="HashSet.html">immutable hash sets</a>.
-  */
-object Set {
-  /** The empty set of this type
-   */
-  def empty[A]: Set[A] = new EmptySet[A]
-
-  /** The canonical factory for this type
-   */
-  def apply[A](elems: A*) = empty[A] ++ elems
-}
-
-/** <p>
- *    This class defines the interface for immutable sets.  Operations
- *    on an immutable set leave the original set unchanged, and return
- *    a new set if needed.
- *  </p>
- *  <p>
- *    Concrete set implementations just have to provide functionality for
- *    the abstract methods in <code>scala.collection.Set</code> as well as
- *    for <code>+</code> and <code>-</code>.
- *  </p>
- *  <p>
- *    Note that abstract immutable.Set's are not covariant in their type
- *    parameter.  This is because some implementations cannot support the
- *    <code>+</code> method for arbitrary types.
- *  </p>
- *
- *  @author  Matthias Zenger, Martin Odersky
- *  @version 1.1, 03/05/2004
+/** A generic trait for immutable sets
  */
-trait Set[A] extends AnyRef with collection.Set[A] {
-
-  /** @return an empty set of arbitrary element type
-   */
-  def empty[B]: Set[B]
-
-  /** Create a new set with an additional element.
-   */
-  def +(elem: A): Set[A]
-
-  /** Add two or more elements to this set.
-   *  @param    elem1 the first element.
-   *  @param    elem2 the second element.
-   *  @param    elems the remaining elements.
-   *  @return a new set with the elements added.
-   */
-  def + (elem1: A, elem2: A, elems: A*): Set[A] =
-    this + elem1 + elem2 ++ elems
-
-  /** Add all the elements provided by an iterator
-   *  of the iterable object <code>elems</code> to the set.
-   *
-   *  @param elems  the iterable object containing the elements to be added
-   *  @return a new set with the elements added.
-   */
-  def ++ (elems: Iterable[A]): Set[A] =
-    (this /: elems) ((s, elem) => s + elem)
-
-  /** Add all the elements provided by an iterator to the set.
-   *  @param elems  the iterator containing the elements to be added
-   *  @return a new set with the elements added.
-   */
-  def ++ (elems: Iterator[A]): Set[A] =
-    (this /: elems) ((s, elem) => s + elem)
-
-  /** <code>incl</code> can be used to add many elements to the set
-   *  at the same time.
-   *  @deprecated use <code>+</code> instead
-   */
-  @deprecated
-  def incl(elems: A*): Set[A] = incl(elems)
-
-  /** This method will add all the elements provided by an iterator
-   *  of the iterable object <code>that</code> to the set.
-   *  @deprecated use <code>++</code> instead
-   */
-  @deprecated
-  def incl(that: Iterable[A]): Set[A] =
-    that.foldLeft(this)((set, elem) => set + elem)
+trait Set[A] extends Iterable[A] with collection.Set[A] with SetTemplate[A, Set[A]] { self =>
 
-  /** Remove a single element from a set.
-   *  @param elem the element to be removed
-   *  @return a new set with the element removed.
-   */
-  def -(elem: A): Set[A]
+  override def empty = Set.empty
 
-  /** Remove two or more elements from this set.
-   *
-   *  @param    elem1 the first element.
-   *  @param    elem2 the second element.
-   *  @param    elems the remaining elements.
-   *  @return a new set with the elements removed.
-   */
-  def - (elem1: A, elem2: A, elems: A*): Set[A] =
-    this - elem1 - elem2 -- elems
+  override def hashCode = (Set.hashSeed /: this)(_ * 41 + _.hashCode)
 
-  /** Remove all the elements provided by an iterator
-   *  of the iterable object <code>elems</code> from the set.
-   *
-   *  @param elems An iterable object containing the elements to remove from the set.
-   *  @return a new set with the elements removed.
-   */
-  def -- (elems: Iterable[A]): Set[A] = this -- elems.elements
-
-  /** Remove all the elements provided by an iterator
-   *  <code>elems</code> from the set.
-   *
-   *  @param elems An iterator containing the elements to remove from the set.
-   *  @return a new set with the elements removed.
-   */
-  def -- (elems: Iterator[A]): Set[A] =
-    (this /: elems) ((s, elem) => s - elem)
-
-  /** <code>excl</code> removes many elements from the set.
-   */
-  @deprecated
-  def excl(elems: A*): Set[A] = excl(elems)
-
-  /** This method removes all the elements provided by an iterator
-   *  of the iterable object <code>that</code> from the set.
-   *
-   *  @param that the iterable collection.
-   */
-  @deprecated
-  def excl(that: Iterable[A]): Set[A] =
-    that.foldLeft(this)((set, elem) => set - elem)
-
-  /** This method computes an intersection with set <code>that</code>.
-   *  It removes all the elements that are not present in <code>that</code>.
-   *
-   *  @param that the set to intersect with.
-   */
-  def intersect(that: collection.Set[A]): Set[A] = filter(that.contains)
-
-  /** This method is an alias for <code>intersect</code>.
-   *  It computes an intersection with set <code>that</code>.
-   *  It removes all the elements that are not present in <code>that</code>.
-   *
-   *  @param that the set to intersect with
-   */
-   override def ** (that: collection.Set[A]): Set[A] = intersect(that)
-
-  /** Returns the set resulting from applying the given function <code>f</code> to each
-   *  element of this set.
-   *
-   *  @param f function to apply to each element.
-   *  @return a set containing <code>f(a0), ..., f(an)</code>
-   *          if this set contains <code>a0, ..., an</code>.
-   */
-  override def map[B](f: A => B): Set[B] =
-    foldLeft(empty[B])((set: Set[B], elem: A) => set + f(elem))
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this set, then forms the union of all results.
-   *
-   *  @param f function to apply to each element.
-   *  @return a set containing all elements in each <code>f(a0), ..., f(an)</code>
-   *          if this set contains <code>a0, ..., an</code>.
-   */
-  override def flatMap[B](f: A => Iterable[B]): Set[B] =
-    foldLeft(empty[B])((set: Set[B], elem: A) => set ++ f(elem))
-
-  /** Method <code>filter</code> removes all elements from the set for
-   *  which the predicate <code>p</code> yields the value <code>false</code>.
-   *
-   *  @param p The predicate used to filter the set
-   */
-  override def filter(p: A => Boolean): Set[A] =
-    (this /: toList)((set, elem) => if (p(elem)) set else set - elem)
+  override def traversibleBuilder[B]: Builder[B, Set[B], Any] = Set.newBuilder[B]
+}
 
+object Set extends SetFactory[Set] {
+  private val hashSeed = "Set".hashCode
+  type Coll = Set[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Set[A], Coll] = new BuilderFactory[A, Set[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def empty[A]: Set[A] = FlexSet.empty
 }
+
diff --git a/src/library/scala/collection/immutable/Set1.scala b/src/library/scala/collection/immutable/Set1.scala
deleted file mode 100644
index 8d6e9b50ca..0000000000
--- a/src/library/scala/collection/immutable/Set1.scala
+++ /dev/null
@@ -1,42 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-/** This class implements immutable sets with exactly one element.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set1[A](elem1: A) extends Set[A] {
-
-  def empty[C]: Set[C] = new EmptySet[C]
-
-  def size: Int = 1
-
-  def contains(elem: A): Boolean =
-    elem == elem1
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set2(elem1, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) empty
-    else this
-
-  def elements: Iterator[A] =
-    Iterator.fromValues(elem1)
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Set2.scala b/src/library/scala/collection/immutable/Set2.scala
deleted file mode 100644
index d5e83779f5..0000000000
--- a/src/library/scala/collection/immutable/Set2.scala
+++ /dev/null
@@ -1,43 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-/** This class implements immutable sets with exactly two elements.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set2[A](elem1: A, elem2: A) extends Set[A] {
-
-  def empty[C]: Set[C] = new EmptySet[C]
-
-  def size: Int = 2
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set3(elem1, elem2, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) new Set1(elem2)
-    else if (elem == elem2) new Set1(elem1)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator.fromValues(elem1, elem2)
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Set3.scala b/src/library/scala/collection/immutable/Set3.scala
deleted file mode 100644
index e692bce362..0000000000
--- a/src/library/scala/collection/immutable/Set3.scala
+++ /dev/null
@@ -1,44 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-/** This class implements immutable sets with exactly three elements.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set3[A](elem1: A, elem2: A, elem3: A) extends Set[A] {
-
-  def empty[C]: Set[C] = new EmptySet[C]
-
-  def size: Int = 3
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2 || elem == elem3
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set4(elem1, elem2, elem3, elem)
-
-  def - (elem: A): Set[A] =
-    if      (elem == elem1) new Set2(elem2, elem3)
-    else if (elem == elem2) new Set2(elem1, elem3)
-    else if (elem == elem3) new Set2(elem1, elem2)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator.fromValues(elem1, elem2, elem3)
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/Set4.scala b/src/library/scala/collection/immutable/Set4.scala
deleted file mode 100644
index f4ec9e7078..0000000000
--- a/src/library/scala/collection/immutable/Set4.scala
+++ /dev/null
@@ -1,45 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-
-package scala.collection.immutable
-
-/** This class implements immutable sets with exactly four elements.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set4[A](elem1: A, elem2: A, elem3: A, elem4: A) extends Set[A] {
-
-  def empty[C]: Set[C] = new EmptySet[C]
-
-  def size: Int = 4
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2 || elem == elem3 || elem == elem4
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else HashSet(elem1, elem2, elem3, elem4, elem)
-
-  def - (elem: A): Set[A] =
-    if      (elem == elem1) new Set3(elem2, elem3, elem4)
-    else if (elem == elem2) new Set3(elem1, elem3, elem4)
-    else if (elem == elem3) new Set3(elem1, elem2, elem4)
-    else if (elem == elem4) new Set3(elem1, elem2, elem3)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator.fromValues(elem1, elem2, elem3, elem4)
-}
-
-
-
diff --git a/src/library/scala/collection/immutable/SortedMap.scala b/src/library/scala/collection/immutable/SortedMap.scala
index c18d08e3a3..85b01561a7 100644
--- a/src/library/scala/collection/immutable/SortedMap.scala
+++ b/src/library/scala/collection/immutable/SortedMap.scala
@@ -8,53 +8,55 @@
 
 // $Id$
 
-package scala.collection.immutable
-
-trait SortedMap[A,+B] extends Map[A,B] with collection.SortedMap[A,B] {
-
-  override def rangeImpl(from: Option[A], until: Option[A]): SortedMap[A,B]
-
-  override def from(from: A) = rangeImpl(Some(from), None)
-
-  override def until(until: A) = rangeImpl(None, Some(until))
-
-  override def range(from: A, until: A) = rangeImpl(Some(from),Some(until))
-
-  override def empty[C]: SortedMap[A, C]
-
-  override def update [B1 >: B] (key: A, value: B1): SortedMap[A, B1]
-
-  override def + [B1 >: B] (kv: Pair[A, B1]): SortedMap[A, B1] = update(kv._1, kv._2)
 
-  override def + [B1 >: B] (kv1: Pair[A, B1], kv2: Pair[A, B1], kvs: Pair[A, B1]*): SortedMap[A, B1] =
-    this + kv1 + kv2 ++ kvs
-
-  override def ++ [B1 >: B] (kvs: Iterable[Pair[A, B1]]): SortedMap[A, B1] =
-    ((this: SortedMap[A, B1]) /: kvs) ((m, kv) => m + kv)
-
-  override def ++ [B1 >: B] (kvs: Iterator[Pair[A, B1]]): SortedMap[A, B1] =
-    ((this: SortedMap[A, B1]) /: kvs) ((m, kv) => m + kv)
-
-  override def - (key: A): SortedMap[A, B]
-
-  override def - (key1: A, key2: A, keys: A*): SortedMap[A, B] =
-    this - key1 - key2 -- keys
-
-  override def -- (keys: Iterable[A]): SortedMap[A, B] = this -- keys.elements
-
-  override def -- (keys: Iterator[A]): SortedMap[A, B] =
-    (this /: keys) ((m, key) => m - key)
+/** A map whose keys are sorted.
+ *
+ *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+package scala.collection.immutable
 
-  override def transform[C](f: (A, B) => C): SortedMap[A, C] = {
-    var res = empty[C]
-    foreach { case (key, value) => res = res.update(key, f(key, value)) }
-    res
-  }
-  override def filter(p: Pair[A, B] => Boolean): SortedMap[A, B] = {
-    var res = this
-    foreach {
-      case kv @ (key, _) => if (!p(kv)) { res = res - key }
-    }
-    res
+import generic._
+import annotation.unchecked.uncheckedVariance
+
+trait SortedMap[A, +B] extends Map[A, B]
+                         with collection.SortedMap[A, B]
+                         with ImmutableMapTemplate[A, B, SortedMap[A, B]]
+                         with SortedMapTemplate[A, B, SortedMap[A, B]] {
+
+  /** Needs to be overridden in subclasses. */
+  override def empty: SortedMap[A, B] = throw new UnsupportedOperationException("SortedMap.empty")
+
+  /** Needs to be overridden in subclasses. */
+  override protected[this] def newBuilder : Builder[(A, B), SortedMap[A, B], Any] =
+    throw new UnsupportedOperationException("SortedMap.newBuilder")
+
+  /** Add a key/value pair to this map.
+   *  @param    key the key
+   *  @param    value the value
+   *  @return   A new map with the new binding added to this map
+   */
+  def add [B1 >: B](key: A, value: B1): SortedMap[A, B1]
+
+  /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
+   */
+  override def + [B1 >: B] (kv: (A, B1)): SortedMap[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): SortedMap[A, B1] = {
+    var m = this + elem1 + elem2;
+    for (e <- elems) m = m + e
+    m
   }
 }
+
diff --git a/src/library/scala/collection/immutable/SortedSet.scala b/src/library/scala/collection/immutable/SortedSet.scala
index 1aae9a4987..911cfcba0a 100644
--- a/src/library/scala/collection/immutable/SortedSet.scala
+++ b/src/library/scala/collection/immutable/SortedSet.scala
@@ -8,10 +8,17 @@
 
 // $Id$
 
+/** A sorted set.
+ *
+ *  @author Sean McDirmid
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
 package scala.collection.immutable
 
-trait SortedSet[A] extends scala.collection.SortedSet[A] with Set[A] {
-  override def ++ (elems: Iterable[A]): SortedSet[A] =
-    (this /: elems) ((s, elem) => s + elem)
-  override def +(elem: A): SortedSet[A]
+import generic._
+
+trait SortedSet[A] extends Set[A] with collection.SortedSet[A] with SortedSetTemplate[A, SortedSet[A]] {
+  /** Needs to be overridden in subclasses. */
+  override def empty: SortedSet[A] = throw new UnsupportedOperationException("SortedMap.empty")
 }
diff --git a/src/library/scala/collection/immutable/Stack.scala b/src/library/scala/collection/immutable/Stack.scala
index 4b507daafe..07ff59100f 100644
--- a/src/library/scala/collection/immutable/Stack.scala
+++ b/src/library/scala/collection/immutable/Stack.scala
@@ -22,12 +22,14 @@ object Stack {
  *  structure. Instances of <code>Stack</code> represent
  *  empty stacks; they can be either created by calling the constructor
  *  directly, or by applying the function <code>Stack.Empty</code>.
+ *  @note    This class exists only for historical reason and as an analogue of mutable stacks
+ *           Instead of an immutable stack you can just use a list.
  *
  *  @author  Matthias Zenger
  *  @version 1.0, 10/07/2003
  */
 @serializable
-class Stack[+A] extends Seq[A] {
+class Stack[+A] extends Sequence[A] {
 
   /** Checks if this stack is empty.
    *
@@ -35,24 +37,12 @@ class Stack[+A] extends Seq[A] {
    */
   override def isEmpty: Boolean = true
 
-  /** Returns the size of this stack.
-   *
-   *  @return the stack size.
+  /** The number of elements in the stack
    */
   def length: Int = 0
 
   /** Push an element on the stack.
    *
-   *  @deprecated Use the method <code>push</code> from now on.
-   *
-   *  @param   elem       the element to push on the stack.
-   *  @return the stack with the new element on top.
-   */
-  @deprecated
-  def +[B >: A](elem: B): Stack[B] = new Node(elem)
-
-  /** Push an element on the stack.
-   *
    *  @param   elem       the element to push on the stack.
    *  @return the stack with the new element on top.
    */
@@ -65,29 +55,7 @@ class Stack[+A] extends Seq[A] {
    *  @return the stack with the new elements on top.
    */
   def push[B >: A](elem1: B, elem2: B, elems: B*): Stack[B] =
-    this.push(elem1).push(elem2) ++ elems
-
-  /** Push all elements provided by the given iterable object onto
-   *  the stack. The last element returned by the iterable object
-   *  will be on top of the new stack.
-   *
-   *  @deprecated Use the method <code>push</code> from now on.
-   *
-   *  @param   elems      the iterable object.
-   *  @return the stack with the new elements on top.
-   */
-  @deprecated
-  def +[B >: A](elems: Iterable[B]): Stack[B] =
-    elems.foldLeft(this: Stack[B]){ (stack, elem) => stack + elem }
-
-  /** Push all elements provided by the given iterable object onto
-   *  the stack. The last element returned by the iterable object
-   *  will be on top of the new stack.
-   *
-   *  @param   elems      the iterable object.
-   *  @return the stack with the new elements on top.
-   */
-  def push[B >: A](elems: Iterable[B]): Stack[B] = this ++ elems
+    this.push(elem1).push(elem2).pushAll(elems)
 
   /** Push all elements provided by the given iterator object onto
    *  the stack. The last element returned by the iterable object
@@ -97,31 +65,31 @@ class Stack[+A] extends Seq[A] {
    *  @return the stack with the new elements on top.
    *  @deprecated
    */
-  def ++[B >: A](elems: Iterator[B]): Stack[B] =
-    elems.foldLeft(this: Stack[B]){ (stack, elem) => stack push elem }
+  def pushAll[B >: A](elems: Iterator[B]): Stack[B] =
+    ((this: Stack[B]) /: elems)(_ push _)
 
-  /** Push all elements provided by the given iterable object onto
+  /** Push all elements provided by the given traversible object onto
    *  the stack. The last element returned by the iterable object
    *  will be on top of the new stack.
    *
    *  @param   elems      the iterable object.
    *  @return the stack with the new elements on top.
    */
-  override def ++[B >: A](elems: Iterable[B]): Stack[B] =
-    this ++ elems.elements
+  def pushAll[B >: A](elems: collection.Traversible[B]): Stack[B] =
+    ((this: Stack[B]) /: elems)(_ push _)
 
   /** Returns the top element of the stack. An error is signaled if
    *  there is no element on the stack.
    *
    *  @return the top element.
    */
-  def top: A = throw new NoSuchElementException("no element on stack")
+  def top: A = throw new NoSuchElementException("top of empty stack")
 
   /** Removes the top element from the stack.
    *
    *  @return the new stack without the former top element.
    */
-  def pop: Stack[A] = throw new NoSuchElementException("no element on stack")
+  def pop: Stack[A] = throw new NoSuchElementException("pop of empty stack")
 
   /** Returns the n-th element of this stack. The bottom element has index
    *  0, elements above are indexed with increasing numbers.
@@ -129,11 +97,7 @@ class Stack[+A] extends Seq[A] {
    *  @param   n      the index number.
    *  @return the n-th element on the stack.
    */
-  def apply(n: Int): A = reverse.reverseApply(n)
-
-  private def reverseApply(n: Int): A =
-    if (n > 0) pop.reverseApply(n - 1)
-    else top
+  def apply(n: Int): A = if (n <= 0) top else pop.apply(n - 1)
 
   /** Returns an iterator over all elements on the stack. The iterator
    *  issues elements in the reversed order they were inserted into the
@@ -141,58 +105,30 @@ class Stack[+A] extends Seq[A] {
    *
    *  @return an iterator over all stack elements.
    */
-  override def elements: Iterator[A] = reverse.reverseElements
-
-  private def reverseElements: Iterator[A] = new Iterator[A] {
-    var that: Stack[A] = Stack.this;
-    def hasNext = !that.isEmpty;
-    def next =
-      if (!hasNext) throw new NoSuchElementException("next on empty iterator")
-      else { val res = that.top; that = that.pop; res }
-  }
-
-  /** A stack consisting of all elements of this stack in reverse order.
-   */
-  override def reverse: Stack[A] = {
-    // copy-paste from List.reverse
-    var result: Stack[A] = Stack.Empty
-    var these = this
-    while (!these.isEmpty) {
-      result = result push List(these.top) // see #978
-      these = these.pop
-    }
-    result
-  }
-
-  /** Compares this stack with the given object.
-   *
-   *  @return true, iff the two stacks are equal; i.e. they contain the
-   *          same elements in the same order.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: Stack[_] => this sameElements that
-    case _ => false
+  override def elements: Iterator[A] = new Iterator[A] {
+    private var cur = Stack.this
+    def hasNext: Boolean = !cur.isEmpty
+    def next: A = { val r = top; cur = cur.pop; r }
   }
 
   /** Returns the hash code for this stack.
    *
    *  @return the hash code of the stack.
    */
-  override def hashCode(): Int = 0
+  override def hashCode(): Int = "Stack".hashCode
 
   /**
    * Redefines the prefix of the string representation.
    */
   override def stringPrefix: String = "Stack"
 
-  // Here comes true magic: covariant lists with implicit tail references
   @serializable
   protected class Node[+B >: A](elem: B) extends Stack[B] {
     override def isEmpty: Boolean = false
     override def length: Int = Stack.this.length + 1
     override def top: B = elem
     override def pop: Stack[B] = Stack.this
-    override def hashCode(): Int = elem.hashCode() + Stack.this.hashCode()
+    override def hashCode(): Int = elem.hashCode() * 37 + Stack.this.hashCode()
   }
-
 }
+
diff --git a/src/library/scala/collection/immutable/Stream.scala b/src/library/scala/collection/immutable/Stream.scala
new file mode 100755
index 0000000000..656252c282
--- /dev/null
+++ b/src/library/scala/collection/immutable/Stream.scala
@@ -0,0 +1,561 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Stream.scala 16287 2008-10-18 13:41:36Z nielsen $
+
+
+package scala.collection.immutable
+
+import mutable.ListBuffer
+import generic.{SequenceFactory, Builder, BuilderFactory, LazyBuilder, LinearSequenceTemplate}
+
+/**
+ * <p>The class <code>Stream</code> implements lazy lists where elements
+ * are only evaluated when they are needed. Here is an example:</p>
+ * <pre>
+ * <b>object</b> Main <b>extends</b> Application {
+ *
+ *   <b>def</b> from(n: Int): Stream[Int] =
+ *     Stream.cons(n, from(n + 1))
+ *
+ *   <b>def</b> sieve(s: Stream[Int]): Stream[Int] =
+ *     Stream.cons(s.head, sieve(s.tail filter { _ % s.head != 0 }))
+ *
+ *   <b>def</b> primes = sieve(from(2))
+ *
+ *   primes take 10 print
+ * }
+ * </pre>
+ *
+ * @author Martin Odersky, Matthias Zenger
+ * @version 1.1 08/08/03
+ */
+abstract class Stream[+A] extends LinearSequence[A] with LinearSequenceTemplate[A, Stream[A]] {
+self =>
+  import collection.{Traversible, Iterable, Sequence, Vector}
+
+  /** is this stream empty? */
+  def isEmpty: Boolean
+
+  /** The first element of this stream
+   *  @throws Predef.NoSuchElementException if the stream is empty.
+   */
+  def head: A
+
+  /** A stream consisting of the remaining elements of this stream after the first one.
+   *  @throws Predef.UnsupportedOperationException if the stream is empty.
+   */
+  def tail: Stream[A]
+
+  /** Is the tail of this stream defined? */
+  protected def tailDefined: Boolean
+
+  // Implementation of abstract method in Traversible
+
+  /** The builder for stream objects.
+   *  @note: This builder is lazy only in the sense that it does not go downs the spine
+   *         of traversibles taht are added as a whole. If more layzness can be achieved,
+   *         this builder should be bypassed.
+   */
+  override protected[this] def newBuilder = Stream.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Stream[B], Any] = Stream.newBuilder[B]
+
+  // New methods in Stream
+
+  /** The stream resulting from the concatenation of this stream with the argument stream.
+   *  @param rest   The stream that gets appended to this stream
+   */
+  def append[B >: A](rest: => Traversible[B]): Stream[B] =
+    if (isEmpty) rest.toStream else new Stream.Cons(head, tail append rest)
+
+  /** Force evaluation of the whole stream and return it */
+  def force: Stream[A] = {
+    var these = this
+    while (!isEmpty) these = these.tail
+    this
+  }
+
+  /** Does this stream have more than one elements defined?
+   */
+  private def hasMoreThanOneElements = false
+
+  /** Prints elements of this stream one by one, separated by commas */
+  def print() { print(", ") }
+
+  /** Prints elements of this stream one by one, separated by <code>sep</code>
+   *  @param sep   The separator string printed between consecutive elements.
+   */
+  def print(sep: String) {
+    def loop(these: Stream[A], start: String) {
+      Console.print(start)
+      if (these.isEmpty) Console.print("empty")
+      else {
+        Console.print(these.head)
+        loop(these.tail, sep)
+      }
+    }
+    loop(this, "")
+  }
+
+  // Overridden methods from Traversible
+
+  override def toStream: Stream[A] = this
+
+  override def hasDefiniteSize = {
+    def loop(s: Stream[A]): Boolean = s.isEmpty || s.tailDefined && loop(s.tail)
+    loop(this)
+  }
+
+  /** Create a new stream which contains all elements of this stream
+   *  followed by all elements of Traversible `that'
+   *  @note It's subtle why this works. We know that if the target type
+   *  of the Builder That is either a Stream, or one of its supertypes, or undefined,
+   *  then StreamBuilder will be chosen for the implicit.
+   *  we recognize that fact and optimize to get more laziness.
+   */
+  override def ++[B >: A, That](that: Traversible[B])(implicit bf: BuilderFactory[B, That, Stream[A]]): That = {
+    def loop(these: Stream[A]): Stream[B] =
+      if (these.isEmpty) that.toStream else new Stream.Cons(these.head, loop(these.tail))
+    if (bf.isInstanceOf[Stream.StreamBuilderFactory[_]]) loop(this).asInstanceOf[That]
+    else super.++(that)
+  }
+
+  /** Create a new stream which contains all elements of this stream
+   *  followed by all elements of Iterator `that'
+   */
+  override def++[B >: A, That](that: Iterator[B])(implicit bf: BuilderFactory[B, That, Stream[A]]): That =
+    this ++ that.toStream
+
+  /** Returns the stream resulting from applying the given function
+   *  <code>f</code> to each element of this stream.
+   *
+   *  @param f function to apply to each element.
+   *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
+   *           sequence is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
+   */
+  override def map[B, That](f: A => B)(implicit bf: BuilderFactory[B, That, Stream[A]]): That = {
+    def loop(these: Stream[A]): Stream[B] =
+      if (these.isEmpty) Stream.Empty else new Stream.Cons(f(these.head), loop(these.tail))
+    if (bf.isInstanceOf[Stream.StreamBuilderFactory[_]]) loop(this).asInstanceOf[That]
+    else super.map(f)
+  }
+
+  /** Applies the given function <code>f</code> to each element of
+   *  this stream, then concatenates the results.
+   *
+   *  @param f the function to apply on each element.
+   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
+   *           this stream is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
+   */
+  override def flatMap[B, That](f: A => Traversible[B])(implicit bf: BuilderFactory[B, That, Stream[A]]): That = {
+    def loop(these: Stream[A]): Stream[B] =
+      if (these.isEmpty) Stream.Empty
+      else {
+        val seg = f(these.head)
+        if (seg.isEmpty) loop(these.tail)
+        else seg.toStream ++ loop(these.tail)
+      }
+    if (bf.isInstanceOf[Stream.StreamBuilderFactory[_]]) loop(this).asInstanceOf[That]
+    else super.flatMap(f)
+  }
+
+  /** Returns all the elements of this stream that satisfy the
+   *  predicate <code>p</code>. The order of the elements is preserved.
+   *
+   *  @param p the predicate used to filter the stream.
+   *  @return the elements of this stream satisfying <code>p</code>.
+   */
+  override def filter(p: A => Boolean): Stream[A] = {
+    // drops A's for which p yields false
+    def loop(these: Stream[A]): Stream[A] =
+      if (these.isEmpty) Stream.Empty
+      else {
+        val b = p(these.head)
+        if (!b) loop(these.tail)
+        else new Stream.Cons(these.head, these.tail filter p)
+      }
+    loop(this)
+  }
+
+  /** Returns all the elements of this stream that satisfy the
+   *  predicate <code>p</code>. The order of the elements is preserved.
+   *
+   *  @param p the predicate used to filter the stream.
+   *  @return the elements of this stream satisfying <code>p</code>.
+   */
+  override def partition(p: A => Boolean): (Stream[A], Stream[A]) = (filter(p(_)), remove(p(_)))
+
+  /** Returns a stream formed from this stream and the specified stream
+   *  <code>that</code> by associating each element of the former with
+   *  the element at the same position in the latter.
+   *  If one of the two streams is longer than the other, its remaining elements are ignored.
+   *
+   *  @return     <code>Stream({a<sub>0</sub>,b<sub>0</sub>}, ...,
+   *              {a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>)}</code> when
+   *              <code>Stream(a<sub>0</sub>, ..., a<sub>m</sub>)
+   *              zip Stream(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
+   */
+  override def zip[A1 >: A, B, That](that: Sequence[B])(implicit bf: BuilderFactory[(A1, B), That, Stream[A]]): That = {
+    def loop(these: Stream[A], elems2: Iterator[B]): Stream[(A1, B)] =
+      if (these.isEmpty || !elems2.hasNext) Stream.Empty
+      else new Stream.Cons((these.head, elems2.next), loop(these.tail, elems2))
+    if (bf.isInstanceOf[Stream.StreamBuilderFactory[_]]) loop(this, that.elements).asInstanceOf[That]
+    else super.zip[A1, B, That](that)
+  }
+
+  /** Zips this iterable with its indices. `s.zipWithIndex` is equivalent to
+   *  `s zip s.indices`
+   */
+  override def zipWithIndex[A1 >: A, That](implicit bf: BuilderFactory[(A1, Int), That, Stream[A]]): That =
+    this.zip[A1, Int, That](Stream.from(0))
+
+  /** Write all defined elements of this iterable into given string builder.
+   *  The written text begins with the string <code>start</code> and is finished by the string
+   *  <code>end</code>. Inside, the string representations of defined elements (w.r.t.
+   *  the method <code>toString()</code>) are separated by the string
+   *  <code>sep</code>. The method will not force evaluation of undefined elements. A
+   *  tail of such elements will be represented by a "?" instead.
+   */
+  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
+    def loop(pre: String, these: Stream[A]) {
+      if (these.isEmpty) b append end
+      else {
+        b append pre append these.head
+        if (these.tailDefined) loop(sep, these.tail)
+        else b append sep append "?" append end
+      }
+    }
+    b append start
+    loop("", this)
+    b
+  }
+
+  /** Returns the <code>n</code> first elements of this stream, or else the whole
+   *  stream, if it has less than <code>n</code> elements.
+   *
+   *  @param n the number of elements to take.
+   *  @return the <code>n</code> first elements of this stream.
+   */
+  override def take(n: Int): Stream[A] =
+    if (n <= 0 || isEmpty) Stream.Empty else new Stream.Cons(head, tail take (n-1))
+
+  /** Returns the stream without its <code>n</code> first elements.
+   *  If the stream has less than <code>n</code> elements, the empty stream is returned.
+   *
+   *  @param n the number of elements to drop.
+   *  @return the stream without its <code>n</code> first elements.
+   */
+  override def drop(n: Int): Stream[A] = {
+    var these: Stream[A] = this
+    var count = n
+    while (!these.isEmpty && count > 0) {
+      these = these.tail
+      count -= 1
+    }
+    these
+  }
+
+  /** A substream starting at index `from`
+   *  and extending up to (but not including) index `until`.
+   *
+   *  @note This is equivalent to (but possibly more efficient than)
+   *  c.drop(from).take(to - from)
+   *
+   *  @param start   The index of the first element of the returned subsequence
+   *  @param end     The index of the element following the returned subsequence
+   *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
+   *          or <code>length &lt; from + len<code>
+   *  @note  Might return different results for different runs, unless this iterable is ordered
+   */
+  override def slice(start: Int, end: Int): Stream[A] = {
+    var len = end
+    if (start > 0) len -= start
+    drop(start) take len
+  }
+
+  /** The stream without its last element.
+   *  @throws Predef.UnsupportedOperationException if the stream is empty.
+   */
+  override def init: Stream[A] =
+    if (isEmpty) super.init
+    else if (tail.isEmpty) Stream.Empty
+    else new Stream.Cons(head, tail.init)
+
+  /** Returns the rightmost <code>n</code> elements from this iterable.
+   *  @param n the number of elements to take
+   */
+  override def takeRight(n: Int): Stream[A] = {
+    var these: Stream[A] = this
+    var lead = this drop n
+    while (!lead.isEmpty) {
+      these = these.tail
+      lead = lead.tail
+    }
+    these
+  }
+
+  // there's nothing we can do about dropRight, so we just keep the definition in LinearSequence
+
+  /** Returns the longest prefix of this stream whose elements satisfy
+   *  the predicate <code>p</code>.
+   *
+   *  @param p the test predicate.
+   */
+  override def takeWhile(p: A => Boolean): Stream[A] =
+    if (!isEmpty && p(head)) new Stream.Cons(head, tail takeWhile p)
+    else Stream.Empty
+
+  /** Returns the longest suffix of this iterable whose first element
+   *  does not satisfy the predicate <code>p</code>.
+   *
+   *  @param p the test predicate.
+   */
+  override def dropWhile(p: A => Boolean): Stream[A] = {
+    var these: Stream[A] = this
+    while (!these.isEmpty && p(these.head)) these = these.tail
+    these
+  }
+
+  /** Builds a new stream from this stream in which any duplicates (wrt to ==) removed.
+   *  Among duplicate elements, only the first one is retained in the result stream
+   */
+  override def removeDuplicates: Stream[A] =
+    if (isEmpty) this
+    else new Stream.Cons(head, tail.filter(head !=).removeDuplicates)
+
+  /** Returns a new sequence of given length containing the elements of this sequence followed by zero
+   *  or more occurrences of given elements.
+   */
+  override def padTo[B >: A, That](len: Int, elem: B)(implicit bf: BuilderFactory[B, That, Stream[A]]): That = {
+    def loop(len: Int, these: Stream[A]): Stream[B] =
+      if (these.isEmpty) Stream.fill(len)(elem)
+      else new Stream.Cons(these.head, loop(len - 1, these.tail))
+    if (bf.isInstanceOf[Stream.StreamBuilderFactory[_]]) loop(len, this).asInstanceOf[That]
+    else super.padTo(len, elem)
+  }
+
+  /** A list consisting of all elements of this list in reverse order.
+   */
+  override def reverse: Stream[A] = {
+    var result: Stream[A] = Stream.Empty
+    var these = this
+    while (!these.isEmpty) {
+      val r = Stream.consWrapper(result).#::(these.head)
+      r.tail // force it!
+      result = r
+      these = these.tail
+    }
+    result
+  }
+
+  /** Defines the prefix of this object's <code>toString</code> representation as ``Stream''.
+   */
+  override def stringPrefix = "Stream"
+}
+
+/**
+ * The object <code>Stream</code> provides helper functions
+ * to manipulate streams.
+ *
+ * @author Martin Odersky, Matthias Zenger
+ * @version 1.1 08/08/03
+ */
+object Stream extends SequenceFactory[Stream] {
+
+  type Coll = Stream[_]
+  class StreamBuilderFactory[A] extends BuilderFactory[A, Stream[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  implicit def builderFactory[A]: BuilderFactory[A, Stream[A], Coll] = new StreamBuilderFactory[A]
+
+  /** Creates a new builder for a stream */
+  def newBuilder[A]: Builder[A, Stream[A], Any] = new StreamBuilder[A]
+
+  import collection.{Iterable, Sequence, Vector}
+
+  /** A builder for streams
+   */
+  class StreamBuilder[A] extends LazyBuilder[A, Stream[A], Any] {
+    def result: Stream[A] = (for (xs <- parts.elements; x <- xs.toIterable.elements) yield x).toStream
+  }
+
+  object Empty extends Stream[Nothing] {
+    override def isEmpty = true
+    override def head = throw new NoSuchElementException("head of empty stream")
+    override def tail = throw new UnsupportedOperationException("tail of empty stream")
+    def tailDefined = false
+  }
+
+  /** The empty stream */
+  override def empty[A]: Stream[A] = Empty
+
+  /** A stream consisting of given elements */
+  override def apply[A](xs: A*): Stream[A] = Iterable.fromOld(xs).toStream
+
+  /** A wrapper class that adds `#::` for cons and `#:::` for concat as operations
+   *  to streams.
+   */
+  class ConsWrapper[A](tl: => Stream[A]) {
+    def #::(hd: A): Stream[A] = new Stream.Cons(hd, tl)
+    def #:::(prefix: Stream[A]): Stream[A] = prefix append tl
+  }
+
+  /** A wrapper method that adds `#::` for cons and `#::: for concat as operations
+   *  to streams.
+   */
+  implicit def consWrapper[A](stream: => Stream[A]): ConsWrapper[A] =
+    new ConsWrapper[A](stream)
+
+  /** An extractor that allows to pattern match streams with `#::`.
+   */
+  object #:: {
+    def unapply[A](xs: Stream[A]): Option[(A, Stream[A])] =
+      if (xs.isEmpty) None
+      else Some((xs.head, xs.tail))
+  }
+
+  /** @deprecated   use #:: instead */
+  @deprecated lazy val lazy_:: = #::
+
+  /** An alternative way of building and matching Streams using Stream.cons(hd, tl).
+   */
+  object cons {
+
+    /** A stream consisting of a given first element and remaining elements
+     *  @param hd   The first element of the result stream
+     *  @param tl   The remaining elements of the result stream
+     */
+    def apply[A](hd: A, tl: => Stream[A]) = new Cons(hd, tl)
+
+    /** Maps a stream to its head and tail */
+    def unapply[A](xs: Stream[A]): Option[(A, Stream[A])] = #::.unapply(xs)
+  }
+
+  /** A lazy cons cell, from which streams are built. */
+  final class Cons[+A](hd: A, tl: => Stream[A]) extends Stream[A] {
+    override def isEmpty = false
+    override def head = hd
+    private[this] var tlVal: Stream[A] = _
+    def tailDefined = tlVal ne null
+    override def tail: Stream[A] = {
+      if (!tailDefined) { tlVal = tl }
+      tlVal
+    }
+  }
+
+  /** An infinite stream that repeatedly applies a given function to a start value.
+   *
+   *  @param start the start value of the stream
+   *  @param f     the function that's repeatedly applied
+   *  @return      the stream returning the infinite sequence of values `start, f(start), f(f(start)), ...`
+   */
+  def iterate(start: Int)(f: Int => Int): Stream[Int] = new Cons(start, iterate(f(start))(f))
+
+  override def iterate(start: Int, len: Int)(f: Int => Int): Stream[Int] = iterate(start)(f) take len
+
+  /**
+   * Create an infinite stream starting at <code>start</code>
+   * and incrementing by step <code>step</code>
+   *
+   * @param start the start value of the stream
+   * @param step the increment value of the stream
+   * @return the stream starting at value <code>start</code>.
+   */
+  def from(start: Int, step: Int): Stream[Int] =
+    new Cons(start, from(start+step, step))
+
+  /**
+   * Create an infinite stream starting at <code>start</code>
+   * and incrementing by 1.
+   *
+   * @param start the start value of the stream
+   * @return the stream starting at value <code>start</code>.
+   */
+  def from(start: Int): Stream[Int] = from(start, 1)
+
+  /**
+   * Create an infinite stream containing the given element expression (which is computed for each
+   * occurrence)
+   * @param elem the element composing the resulting stream
+   * @return the stream containing an inifinite number of elem
+   * @deprecated use fill instead
+   */
+  def fill[A](elem: => A): Stream[A] = new Cons(elem, fill(elem))
+
+  override def fill[A](n: Int)(elem: => A): Stream[A] =
+    if (n <= 0) Empty else new Cons(elem, fill(n-1)(elem))
+
+  override def tabulate[A](n: Int)(f: Int => A): Stream[A] = {
+    def loop(i: Int) =
+      if (i >= n) Empty else new Cons(f(i), tabulate(i+1)(f))
+    loop(0)
+  }
+
+  override def range(start: Int, end: Int, step: Int): Stream[Int] =
+    if (if (step < 0) start <= end else end <= start) Empty
+    else new Cons(start, range(start + step, end, step))
+
+  /** A stream containing all elements of a given iterator, in the order they are produced.
+   *  @param it   The iterator producing the stream's elements
+   *  @deprecated use it.toStream instead
+   */
+  @deprecated def fromIterator[A](it: Iterator[A]): Stream[A] =
+    if (it.hasNext) cons(it.next, fromIterator(it)) else empty
+
+  /** The concatenation of a sequence of streams
+   * @deprecated use xs.flatten instead
+   */
+  @deprecated def concat[A](xs: Iterable[Stream[A]]): Stream[A] = concat(xs.elements)
+
+  /** The concatenation of all streams returned by an iterator
+   * @deprecated use xs.toStream.flatten instead
+   */
+  @deprecated def concat[A](xs: Iterator[Stream[A]]): Stream[A] =
+    if (xs.hasNext) xs.next append concat(xs)
+    else empty
+
+  /**
+   * Create a stream with element values
+   * <code>v<sub>n+1</sub> = step(v<sub>n</sub>)</code>
+   * where <code>v<sub>0</sub> = start</code>
+   * and elements are in the range between <code>start</code> (inclusive)
+   * and <code>end</code> (exclusive)
+   * @deprecated  use @see iterate instead.
+   * @param start the start value of the stream
+   * @param end the end value of the stream
+   * @param step the increment function of the stream, must be monotonically increasing or decreasing
+   * @return the stream starting at value <code>start</code>.
+   */
+  @deprecated def range(start: Int, end: Int, step: Int => Int): Stream[Int] = {
+    val up = step(start) > start
+    val down = step(start) < start
+    def loop(lo: Int): Stream[Int] =
+      if ((!up || lo < end) && (!down || lo > end)) cons(lo, loop(step(lo)))
+      else empty
+    loop(start)
+  }
+
+  /**
+   * Create an infinite stream containing the given element.
+   *
+   * @param elem the element composing the resulting stream
+   * @return the stream containing an inifinite number of elem
+   * @deprecated use fill(elem) instead
+   */
+  @deprecated def const[A](elem: A): Stream[A] = cons(elem, const(elem))
+
+  /** Create a stream containing several copies of an element.
+   *
+   *  @param n    the length of the resulting stream
+   *  @param elem the element composing the resulting stream
+   *  @return     the stream composed of n elements all equal to elem
+   *  @deprecated use fill(n, elem) instead
+   */
+  @deprecated def make[A](n: Int, elem: A): Stream[A] =
+    const(elem) take n
+}
+
+
diff --git a/src/library/scala/collection/immutable/Traversible.scala b/src/library/scala/collection/immutable/Traversible.scala
new file mode 100755
index 0000000000..5236f59681
--- /dev/null
+++ b/src/library/scala/collection/immutable/Traversible.scala
@@ -0,0 +1,24 @@
+package scala.collection.immutable
+
+import generic._
+
+/** A subtrait of Traversible in package collection which represents traversibles
+ *  that cannot be mutated.
+ *  !!! todo: revise equality
+ *  @author  Matthias Zenger
+ *  @autor   Martin Odersky
+ *  @version 2.8
+ */
+trait Traversible[+A] extends collection.Traversible[A] with TraversibleTemplate[A, Traversible[A]] with Immutable { self =>
+  override protected[this] def newBuilder = Traversible.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Traversible[B], Any] = Traversible.newBuilder[B]
+}
+
+/* A factory object for the trait `Traversible` */
+object Traversible extends TraversibleFactory[Traversible] {
+  type Coll = Traversible[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Traversible[A], Coll] = new BuilderFactory[A, Traversible[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Traversible[A], Any] = new mutable.ListBuffer
+}
+
+
diff --git a/src/library/scala/collection/immutable/Tree.scala b/src/library/scala/collection/immutable/Tree.scala.disabled
index cdf3ea61ba..538b2ccf9f 100644
--- a/src/library/scala/collection/immutable/Tree.scala
+++ b/src/library/scala/collection/immutable/Tree.scala.disabled
@@ -1,4 +1,4 @@
-/*                     __                                               *\
+o/*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
 **  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
@@ -8,6 +8,8 @@
 
 // $Id$
 
+// This is probably no longer needed; replaced by RedBlack.scala
+* 
 /* General Balanced Trees - highly efficient functional dictionaries.
 **
 ** This is a scala version of gb_trees.erl which is
@@ -20,7 +22,7 @@
 **
 ** NOTE: This code was until 2007-04-01 under a GPL license. The author has
 ** given permission to remove that license, so that now this code is under
-** the general license for the Scala libraries.
+** the general license for the Scala libraries. 
 */
 
 package scala.collection.immutable
@@ -399,7 +401,7 @@ date	Tue, Apr 29, 2008 at 3:31 PM
 subject	Re: test
 mailed-by	chara.epfl.ch
 signed-by	gmail.com
-
+	
 Hi Martin,
 
 I am fine with that change, and since I don't have a scala distribution handy,
diff --git a/src/library/scala/collection/immutable/TreeHashMap.scala b/src/library/scala/collection/immutable/TreeHashMap.scala
index 33915402ec..80a227b9ad 100644
--- a/src/library/scala/collection/immutable/TreeHashMap.scala
+++ b/src/library/scala/collection/immutable/TreeHashMap.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2008-2009, David MacIver         **
@@ -58,14 +59,16 @@ class TreeHashMap[Key, +Value] private (private val underlying : IntMap[AssocMap
 
   override lazy val size = underlying.values.foldLeft(0)((x, y) => x + y.size);
 
+  // todo: probably drop to make conform with general equals/hashcode policy
   override def equals(that : Any) = that match {
     case (that : TreeHashMap[_, _]) =>
       if (this eq that) true
       else if (this.size != that.size) false;
       else this.underlying == that.underlying;
-    case _ => false;
+    case _ => false
   }
 
+  // todo: probably drop to make conform with general equals/hashcode policy
   override def hashCode = underlying.hashCode
 
   override def foreach(f : ((Key, Value)) => Unit) = underlying.foreachValue(_.foreach(f));
@@ -282,3 +285,4 @@ private[collection] class AssocMapIterator[Key, Value](var it : AssocMap[Key, Va
   }
 }
 
+*/
diff --git a/src/library/scala/collection/immutable/TreeMap.scala b/src/library/scala/collection/immutable/TreeMap.scala
index d915eba861..d679241b5c 100644
--- a/src/library/scala/collection/immutable/TreeMap.scala
+++ b/src/library/scala/collection/immutable/TreeMap.scala
@@ -12,15 +12,14 @@
 
 package scala.collection.immutable
 
+import generic._
 
 /** The canonical factory of <a href="TreeMap.html">TreeMap</a>'s. */
 object TreeMap {
 
-  /** The empty map of this type
-   *  @deprecated   use <code>empty</code> instead
-   */
-  @deprecated
-  def Empty[A <% Ordered[A], B] = empty[A, B]
+  type Coll = TreeMap[_, _]
+  implicit def builderFactory[A <% Ordered[A], B]: BuilderFactory[(A, B), TreeMap[A, B], Coll] = new BuilderFactory[(A, B), TreeMap[A, B], Coll] { def apply(from: Coll) = newBuilder[A, B] }
+  def newBuilder[A <% Ordered[A], B]: Builder[(A, B), TreeMap[A, B], Any] = new ImmutableMapBuilder(empty[A, B])
 
   /** The empty map of this type */
   def empty[A <% Ordered[A], B] = new TreeMap[A, B]
@@ -37,8 +36,14 @@ object TreeMap {
  *  @version 1.1, 03/05/2004
  */
 @serializable
-class TreeMap[A <% Ordered[A], +B](val size: Int, t: RedBlack[A]#Tree[B])
-extends RedBlack[A] with SortedMap[A, B] {
+class TreeMap[A <% Ordered[A], +B](override val size: Int, t: RedBlack[A]#Tree[B])
+  extends RedBlack[A]
+     with SortedMap[A, B]
+     with SortedMapTemplate[A, B, TreeMap[A, B]]
+     with ImmutableMapTemplate[A, B, TreeMap[A, B]] {
+
+  override protected[this] def newBuilder : Builder[(A, B), TreeMap[A, B], Any] =
+    TreeMap.newBuilder[A, B]
 
   def isSmaller(x: A, y: A) = x < y
 
@@ -46,22 +51,20 @@ extends RedBlack[A] with SortedMap[A, B] {
 
   protected val tree: RedBlack[A]#Tree[B] = if (size == 0) Empty else t
 
-  override def rangeImpl(from : Option[A], until : Option[A]) : SortedMap[A,B] = {
+  override def rangeImpl(from : Option[A], until : Option[A]): TreeMap[A,B] = {
     val ntree = tree.range(from,until)
     new TreeMap[A,B](ntree.count, ntree)
   }
+
   override def firstKey = t.first
   override def lastKey = t.last
   override def compare(k0: A, k1: A): Int = k0.compare(k1)
 
-
-
-
   private def newMap[B](s: Int, t: RedBlack[A]#Tree[B]) = new TreeMap[A, B](s, t)
 
   /** A factory to create empty maps of the same type of keys.
    */
-  def empty[C] = TreeMap.empty[A, C]
+  override def empty = TreeMap.empty
 
   /** A new TreeMap with the entry added is returned,
    *  if key is <em>not</em> in the TreeMap, otherwise
@@ -71,11 +74,28 @@ extends RedBlack[A] with SortedMap[A, B] {
    *  @param value ...
    *  @return ...
    */
-  def update [B1 >: B](key: A, value: B1): TreeMap[A, B1] = {
+  def add [B1 >: B](key: A, value: B1): TreeMap[A, B1] = {
     val newsize = if (tree.lookup(key).isEmpty) size + 1 else size
     newMap(newsize, tree.update(key, value))
   }
 
+    /** Add a key/value pair to this map.
+   *  @param    kv the key/value pair
+   *  @return   A new map with the new binding added to this map
+   */
+  override def + [B1 >: B] (kv: (A, B1)): TreeMap[A, B1] = add(kv._1, kv._2)
+
+  /** Adds two or more elements to this collection and returns
+   *  either the collection itself (if it is mutable), or a new collection
+   *  with the added elements.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): TreeMap[A, B1] =
+    this + elem1 + elem2 ++ collection.Iterable.fromOld(elems)
+
   /** A new TreeMap with the entry added is returned,
    *  assuming that key is <em>not</em> in the TreeMap.
    */
@@ -99,37 +119,16 @@ extends RedBlack[A] with SortedMap[A, B] {
     case _ => None
   }
 
-  /** Retrieve the value which is associated with the given key. This
-   *  method throws an exception if there is no mapping from the given
-   *  key to a value.
-   *
-   *  @param  key     the key
-   *  @return the value associated with the given key.
-   *  @throws Error("key not found").
-   */
-  override def apply(key: A): B = tree.lookup(key) match {
-    case n: NonEmpty[b] => n.value
-    case _ => super.apply(key)
-  }
-
   /** Creates a new iterator over all elements contained in this
    *  object.
    *
    *  @return the new iterator
    */
-  def elements: Iterator[Pair[A, B]] = tree.elements.elements
-
-  override def foreach(f : Tuple2[A,B] => Unit) : Unit =
-    tree.visit[Unit](())((unit0,a,b) => Tuple2(true, f(Tuple2(a,b))))
-  override def forall(f : Tuple2[A,B] => Boolean) : Boolean =
-    tree.visit[Boolean](true)((input,a,b) => f(Tuple2(a,b)) match {
-    case ret if input => Tuple2(ret,ret)
-    })._2
-  override def exists(f : Tuple2[A,B] => Boolean) : Boolean =
-    tree.visit[Boolean](false)((input,a,b) => f(Tuple2(a,b)) match {
-    case ret if !input => Tuple2(!ret,ret)
-    })._2
+  def elements: Iterator[(A, B)] = tree.toStream.elements
+
+  override def toStream: Stream[(A, B)] = tree.toStream
 
+  override def foreach(f : ((A,B)) => Unit) = tree foreach { case (x, y) => f(x, y) }
 }
 
 
diff --git a/src/library/scala/collection/immutable/TreeMap.scala.disabled b/src/library/scala/collection/immutable/TreeMap.scala.disabled
deleted file mode 100644
index 0b3bb7a0e7..0000000000
--- a/src/library/scala/collection/immutable/TreeMap.scala.disabled
+++ /dev/null
@@ -1,101 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: TreeMap.scala 8997 2006-10-19 20:52:30Z odersky $
-
-package scala.collection.immutable
-
-
-object TreeMap {
-  def Empty[A <% Ordered[A], B] = new TreeMap[A, B]
-}
-
-/** This class implements immutable maps using a tree.
- *
- *  @author  Erik Stenman
- *  @author  Matthias Zenger
- *  @version 1.1, 03/05/2004
- */
-
-[serializable]
-class TreeMap[A <% Ordered[A], B] extends Tree[A, Pair[A, B]] with Map[A, B] {
-
-  override protected type This = TreeMap[A, B]
-  override protected def getThis: This = this
-
-  /** A factory to create empty maps of the same type of keys.
-   */
-  def empty[C] = new TreeMap[A, C]
-
-  /** Creates a new TreeMap from a GBTree and its size.
-   *
-   *  @param sz ...
-   *  @param t ...
-   *  @return ...
-   */
-  protected def New(sz: Int, t: aNode): This = new TreeMap[A, B] {
-    override def size = sz
-    override protected def tree: aNode = t
-  }
-
-  /** A new TreeMap with the entry added is returned,
-   *  if key is <em>not</em> in the TreeMap, otherwise
-   *  the key is updated with the new entry.
-   *
-   *  @param key ...
-   *  @param value ...
-   *  @return ...
-   */
-  def update [B1 >: B](key: A, value: B1) = updateOrAdd(key, {key, value})
-
-  /** A new TreeMap with the entry added is returned,
-   *  assuming that key is <em>not</em> in the TreeMap.
-   */
-  def insert [B1 >: B](key:A, value:B) = add(key, {key, value})
-
-  /** Removes the key from the TreeMap.
-   */
-  def remove(key:A) = deleteAny(key)
-
-  /** Check if this map maps <code>key</code> to a value and return the
-   *  value if it exists.
-   *
-   *  @param  key     the key of the mapping of interest
-   *  @return the value of the mapping, if it exists
-   */
-  override def get(key: A): Option[B] =
-    findValue(key) match {
-      case Some(Pair(_, value)) => Some(value)
-      case _ => None
-    }
-
-  /** Retrieve the value which is associated with the given key. This
-   *  method throws an exception if there is no mapping from the given
-   *  key to a value.
-   *
-   *  @param  key     the key
-   *  @return the value associated with the given key.
-   *  @throws Error("key not found").
-   */
-  override def apply(key: A): B = tree.apply(key)._2
-
-  /** Creates a list of all (key, value) mappings.
-   *
-   *  @return    the list of all mappings
-   */
-  override def toList: List[Pair[A, B]] =
-    tree.toList(scala.Nil) map (._2)
-
-  /** Creates a new iterator over all elements contained in this
-   *  object.
-   *
-   *  @return the new iterator
-   */
-  def elements: Iterator[Pair[A, B]] = entries
-}
-
diff --git a/src/library/scala/collection/immutable/TreeSet.scala b/src/library/scala/collection/immutable/TreeSet.scala
index 44e50c29a2..49c2578c29 100644
--- a/src/library/scala/collection/immutable/TreeSet.scala
+++ b/src/library/scala/collection/immutable/TreeSet.scala
@@ -11,17 +11,22 @@
 
 package scala.collection.immutable
 
-/** The canonical factory of <a href="TreeSet.html">TreeSet</a>'s. */
+import generic._
 
+/** The canonical factory of <a href="TreeSet.html">TreeSet</a>'s. */
 object TreeSet {
 
+  type Coll = TreeSet[_]
+  implicit def implicitBuilder[A <% Ordered[A]]: Builder[A, TreeSet[A], Coll] = newBuilder[A]
+  def newBuilder[A <% Ordered[A]]: Builder[A, TreeSet[A], Any] = new AddingBuilder(empty[A])
+
   /** The empty set of this type
    */
   def empty[A <% Ordered[A]] = new TreeSet[A]
 
   /** The canonical factory for this type
    */
-  def apply[A <% Ordered[A]](elems: A*) : SortedSet[A] = empty[A] ++ elems
+  def apply[A <% Ordered[A]](elems: A*) : TreeSet[A] = empty[A] ++ elems
 }
 
 /** This class implements immutable sets using a tree.
@@ -31,8 +36,8 @@ object TreeSet {
  */
 
 @serializable
-class TreeSet[A <% Ordered[A]](val size: Int, t: RedBlack[A]#Tree[Unit])
-  extends RedBlack[A] with SortedSet[A] {
+class TreeSet[A <% Ordered[A]](override val size: Int, t: RedBlack[A]#Tree[Unit])
+  extends RedBlack[A] with SortedSet[A] with SortedSetTemplate[A, TreeSet[A]] {
 
   def isSmaller(x: A, y: A) = x < y
 
@@ -42,9 +47,9 @@ class TreeSet[A <% Ordered[A]](val size: Int, t: RedBlack[A]#Tree[Unit])
 
   private def newSet(s: Int, t: RedBlack[A]#Tree[Unit]) = new TreeSet[A](s, t)
 
-  /** A factory to create empty maps of the same type of keys.
+  /** A factory to create empty sets of the same type of keys.
    */
-  def empty[B]: Set[B] = ListSet.empty[B]
+  override def empty = TreeSet.empty
 
   /** A new TreeSet with the entry added is returned,
    */
@@ -77,29 +82,17 @@ class TreeSet[A <% Ordered[A]](val size: Int, t: RedBlack[A]#Tree[Unit])
    *
    *  @return the new iterator
    */
-  def elements: Iterator[A] = tree.elements.elements map (_._1)
+  def elements: Iterator[A] = tree.toStream.elements map (_._1)
 
-  def elementsSlow = tree.elementsSlow map (_._1)
+  override def toStream: Stream[A] = tree.toStream map (_._1)
 
-  override def foreach(f: A => Unit) {
-    tree.visit[Unit](())((unit0, y, unit1) => Tuple2(true, f(y)))
-  }
+  override def foreach(f: A => Unit) = tree foreach { (x, y) => f(x) }
 
-  override def forall(f: A => Boolean): Boolean =
-    tree.visit[Boolean](true)((input, a, unit) => f(a) match {
-    case ret if input => Tuple2(ret, ret)
-    })._2
-
-  override def exists(f: A => Boolean): Boolean =
-    tree.visit[Boolean](false)((input, a, unit) => f(a) match {
-    case ret if !input => Tuple2(!ret, ret)
-    })._2
-
-   override def rangeImpl(from: Option[A], until: Option[A]): TreeSet[A] = {
-     val tree = this.tree.range(from, until)
-     newSet(tree.count, tree)
-   }
-   override def firstKey = tree.first
-   override def lastKey = tree.last
-   override def compare(a0: A, a1: A) = a0.compare(a1)
+  override def rangeImpl(from: Option[A], until: Option[A]): TreeSet[A] = {
+    val tree = this.tree.range(from, until)
+    newSet(tree.count, tree)
+  }
+  override def firstKey = tree.first
+  override def lastKey = tree.last
+  override def compare(a0: A, a1: A) = a0.compare(a1)
 }
diff --git a/src/library/scala/collection/immutable/UnbalancedTreeMap.scala b/src/library/scala/collection/immutable/UnbalancedTreeMap.scala
deleted file mode 100644
index ab8822622b..0000000000
--- a/src/library/scala/collection/immutable/UnbalancedTreeMap.scala
+++ /dev/null
@@ -1,143 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-// todo: make balanced once Tree.scala is updated to be covariant.
-
-package scala.collection.immutable
-
-
-object UnbalancedTreeMap {
-
-  /** The empty map of this type */
-  def empty[A <% Ordered[A], B] = new UnbalancedTreeMap[A, B]
-
-  /** The canonical factory for this type
-   */
-  def apply[A<% Ordered[A], B](elems: (A, B)*) = empty[A, B] ++ elems
-}
-
-/** This class implements immutable maps using a tree.
- *
- *  @author  Martin Odersky
- *  @version 1.1, 02/01/2007
- */
-
-@serializable
-class UnbalancedTreeMap[A <% Ordered[A], +B] extends Map[A, B] {
-
-  /** A factory to create empty maps of the same type of keys.
-   */
-  def empty[C] = UnbalancedTreeMap.empty[A, C]
-
-  def size: Int = 0
-
-  override def isEmpty: Boolean = true
-
-  protected def add [B1 >: B](key: A, value: B1) = new Node(key, value, this, this)
-  protected def findValue (key: A): UnbalancedTreeMap[A, B] = this
-
-  protected def key: A = throw new NoSuchElementException("empty map")
-  protected def value: B = throw new NoSuchElementException("empty map")
-  protected def smallest: UnbalancedTreeMap[A, B] = throw new NoSuchElementException("empty map")
-
-  /** A new TreeMap with the entry added is returned,
-   *  if key is <em>not</em> in the TreeMap, otherwise
-   *  the key is updated with the new entry.
-   *
-   *  @param key ...
-   *  @param value ...
-   *  @return ...
-   */
-  def update[B1 >: B](key: A, value: B1) = add(key, value)
-
-  /** A new TreeMap with the entry added is returned,
-   *  assuming that key is <em>not</em> in the TreeMap.
-   */
-  def insert[B1 >: B](key: A, value: B1) = add(key, value)
-
-  def - (key:A): UnbalancedTreeMap[A, B] = this
-
-  /** Check if this map maps <code>key</code> to a value and return the
-   *  value if it exists.
-   *
-   *  @param  key     the key of the mapping of interest
-   *  @return the value of the mapping, if it exists
-   */
-  override def get(key: A): Option[B] = {
-    val t = findValue(key)
-    if (t.isEmpty) None
-    else Some(t.value)
-  }
-
-  /** Retrieve the value which is associated with the given key. This
-   *  method throws an exception if there is no mapping from the given
-   *  key to a value.
-   *
-   *  @param  key     the key
-   *  @return the value associated with the given key.
-   *  @throws Error("key not found").
-   */
-  override def apply(key: A): B = {
-    val t = findValue(key)
-    if (!t.isEmpty) t.value
-    else super.apply(key)
-  }
-
-  /** Creates a new iterator over all elements contained in this
-   *  object.
-   *
-   *  @return the new iterator
-   */
-  def elements: Iterator[(A, B)] = Iterator.empty
-
-  protected class Node[+B](override protected val key: A,
-                           override protected val value: B,
-                           left: UnbalancedTreeMap[A, B],
-                           right: UnbalancedTreeMap[A, B]) extends UnbalancedTreeMap[A, B]
-  {
-    override def size = left.size + right.size + 1
-
-    override def isEmpty = false
-
-    override protected def add [B1 >: B](k: A, v: B1) =
-      if (k < key) new Node[B1](key, value, left.add(k, v), right)
-      else if (k > key) new Node[B1](key, value, left, right.add(k, v))
-      else new Node[B1](k, v, left, right)
-
-    override protected def findValue (k: A): UnbalancedTreeMap[A, B] =
-      if (k < key) left.findValue(k)
-      else if (k > key) right.findValue(k)
-      else this
-
-    override protected def smallest: UnbalancedTreeMap[A, B] =
-      if (left.isEmpty) this else left.smallest
-
-    override def - (k: A): UnbalancedTreeMap[A, B] =
-      if (k < key) new Node(key, value, left - k, right)
-      else if (k > key) new Node(key, value, left, right - k)
-      else combine(left, right)
-
-    private def combine[B](l: UnbalancedTreeMap[A, B], r: UnbalancedTreeMap[A, B]) = {
-      if (l.isEmpty) r
-      else if (r.isEmpty) l
-      else {
-        val s = r.smallest
-        new Node(s.key, s.value, l, r - s.key)
-      }
-    }
-
-    override def elements: Iterator[(A, B)] =
-      left.elements append Iterator.single((key, value)) append right.elements
-  }
-}
-
-
-
-
diff --git a/src/library/scala/collection/immutable/Vector.scala b/src/library/scala/collection/immutable/Vector.scala
new file mode 100755
index 0000000000..7bb76c5518
--- /dev/null
+++ b/src/library/scala/collection/immutable/Vector.scala
@@ -0,0 +1,29 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.immutable
+
+import generic._
+import mutable.ArrayBuffer
+
+/** A subtrait of collection.Vector which represents sequences
+ *  that cannot be mutated.
+ */
+trait Vector[+A] extends Sequence[A] with collection.Vector[A] with VectorTemplate[A, Vector[A]] { self =>
+  override protected[this] def newBuilder = Vector.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Vector[B], Any] = Vector.newBuilder[B]
+}
+
+object Vector extends SequenceFactory[Vector] {
+  type Coll = Vector[_]
+  class Impl[A](buf: ArrayBuffer[A]) extends Vector[A] { // todo: insert better vector implementation here
+    def length = buf.length
+    def apply(idx: Int) = buf.apply(idx)
+  }
+  implicit def builderFactory[A]: BuilderFactory[A, Vector[A], Coll] = new BuilderFactory[A, Vector[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Vector[A], Any] = new ArrayBuffer[A] mapResult (buf => new Impl(buf))
+}
diff --git a/src/library/scala/collection/jcl/ArrayList.scala b/src/library/scala/collection/jcl/ArrayList.scala
deleted file mode 100644
index 90eaa93050..0000000000
--- a/src/library/scala/collection/jcl/ArrayList.scala
+++ /dev/null
@@ -1,21 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Creates a buffer backed by a Java array list.
- *
- *  @author Sean McDirmid
- */
-class ArrayList[A](override val underlying : java.util.ArrayList[A]) extends BufferWrapper[A]  {
-  def this() = this(new java.util.ArrayList[A]);
-  override def clone: ArrayList[A] =
-    new ArrayList[A](underlying.clone().asInstanceOf[java.util.ArrayList[A]])
-}
diff --git a/src/library/scala/collection/jcl/Buffer.scala b/src/library/scala/collection/jcl/Buffer.scala
deleted file mode 100644
index 5f6d898db1..0000000000
--- a/src/library/scala/collection/jcl/Buffer.scala
+++ /dev/null
@@ -1,229 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** A mutable sequence that supports element insertion and update.
- *
- *  @author Sean McDirmid
- */
-trait Buffer[A] extends RandomAccessSeq.Mutable[A] with Ranged[Int,A] with MutableSeq[A] with Collection[A] {
-  final protected type SortedSelf = Buffer[A];
-
-  override def projection : Buffer.Projection[A] = new Buffer.Projection[A] {
-    override def elements = Buffer.this.elements
-    override def length = Buffer.this.length
-    override def apply(idx : Int) = Buffer.this.apply(idx)
-    override def transform(f : A => A) = Buffer.this.transform(f)
-  }
-
-  protected class DefaultBufferIterator extends DefaultSeqIterator with BufferIterator[Int,A] {
-    override def set(a : A) = {
-      if (index == 0) throw new NoSuchElementException
-      Buffer.this.set(index - 1, a)
-    }
-    override def add(a : A) = {
-      Buffer.this.add(index, a)
-    }
-  }
-  override def elements : BufferIterator[Int,A] = new DefaultBufferIterator
-
-  /** The first index of a buffer is 0. */
-  override def firstKey = 0;
-
-  /** The last index of a buffer is its size - 1. */
-  override def lastKey = size - 1;
-
-  /** Indices are compared through subtraction. */
-  final def compare(k0 : Int, k1 : Int) = k0 - k1;
-
-  /** Removes the element at index <code>idx</code> */
-  def remove(idx : Int) = {
-    val i = elements;
-    val ret = i.seek(idx); i.remove; ret;
-  }
-  /** Removes N elements from index <code>idx</code> */
-  def remove(idx : Int, length : Int) = {
-    val i = elements
-    i.seek(idx)
-    for (j <- 0.until(length)) i.remove
-  }
-  /** replaces */
-  def replace(from : Int, length : Int, added : Seq[A]) = {
-    val min = if (length < added.length) length else added.length
-    val i = added.elements
-    var j = 0
-    while (j < length && i.hasNext) {
-      set(from + j, i.next); j = j + 1
-    }
-    assert(j == min)
-    if (i.hasNext) {
-      val slice = added.drop(length)
-      assert(!slice.isEmpty)
-      addAll(from + min, slice)
-    } else if (j < length) {
-      assert(length > min)
-      remove(from + min, length - min)
-    }
-  }
-
-  /** Replaces the element at index "idx" with "a."
-    * @returns the element replaced.
-    */
-  def set(idx : Int, a : A) : A = {
-    val i = elements;
-    val ret = i.seek(idx); i.set(a); ret;
-  }
-
-  /** Equivalent to set except the replaced element is not returned. */
-  def update(idx : Int, a : A) : Unit = set(idx, a);
-
-  /** @returns always true. */
-  def add(a : A) : Boolean = {
-    val i = elements;
-    while (i.hasNext) i.next;
-    i.add(a);
-    true;
-  }
-
-  /** Inserts "a" into this buffer just before the element at index "idx." */
-  def add(idx: Int, a: A): Unit = {
-    val i = elements; i.seek(idx);
-    i.add(a);
-  }
-
-  /** Inserts all elements of <code>that</code> into this buffer just before
-   *  the element at index <code>idx</code>.
-   *
-   *  @param idx  ..
-   *  @param that ..
-   */
-  def addAll(idx: Int, that: Iterable[A]): Unit = {
-    val i = elements; i.seek(idx);
-    for (that <- that) {
-      i.add(that); i.next;
-    }
-  }
-
-  override def transform(f: A => A): Boolean = {
-    var changed = false;
-    val i = elements;
-    while (i.hasNext) {
-      val a0 = i.next;
-      val a1 = f(a0);
-      if (a0 != a1) {
-        i.set(a1); changed = true;
-      }
-    }
-    changed;
-  }
-  override def +(a : A) : this.type = super[Collection].+(a);
-  override def -=(a : A) = super[Collection].-=(a);
-  override def isEmpty = super[MutableSeq].isEmpty;
-  override def rangeImpl(from : Option[Int], until : Option[Int]) : Buffer[A] = new Range(from, until);
-
-
-  protected class Range(var from : Option[Int], var until : Option[Int]) extends Buffer[A] {
-    if (from == None && until == None) throw new IllegalArgumentException;
-    if (from != None && until != None && !(from.get < until.get)) throw new IllegalArgumentException;
-    override def add(a : A) =
-      if (until == None) Buffer.this.add(a);
-      else {
-        Buffer.this.add(until.get, a);
-        true;
-      }
-    private def translate(idx : Int) = {
-      if (until != None && idx > until.get) throw new IllegalArgumentException;
-      else if (from != None) from.get + idx;
-      else idx;
-    }
-    override def apply(idx : Int) : A = Buffer.this.apply(translate(idx));
-    override def set(idx : Int, a : A) = Buffer.this.set(translate(idx), a);
-    override def add(idx : Int, a : A) = Buffer.this.add(translate(idx), a);
-    override def remove(idx : Int) = Buffer.this.remove(translate(idx));
-    override def length = {
-      if (until != None) {
-        if (from != None) until.get - from.get;
-        else until.get;
-      } else super.length;
-    }
-    override def elements : BufferIterator[Int,A] = new RangeIterator;
-    class RangeIterator extends BufferIterator[Int,A] {
-      val underlying = Buffer.this.elements;
-      if (from != None) underlying.seek(from.get);
-      def hasNext = underlying.hasNext &&
-        (until == None || underlying.nextIndex < until.get);
-      def hasPrevious = underlying.hasPrevious &&
-        (from == None || underlying.previousIndex >= from.get);
-      def next = {
-        if (until != None && underlying.nextIndex >= until.get) throw new NoSuchElementException;
-        underlying.next;
-      }
-      def previous = {
-        if (from != None && underlying.previousIndex < from.get) throw new NoSuchElementException;
-        underlying.previous;
-      }
-      def add(a : A) = {
-        if (until != None && underlying.nextIndex > until.get) throw new NoSuchElementException;
-        if (from != None && underlying.previousIndex < from.get) throw new NoSuchElementException;
-        underlying.add(a);
-        if (until != None) until = Some(until.get + 1);
-      }
-      def set(a : A) = {
-        if (until != None && underlying.nextIndex > until.get) throw new NoSuchElementException;
-        if (from != None && underlying.previousIndex < from.get) throw new NoSuchElementException;
-        underlying.set(a);
-      }
-      def remove = {
-        if (until != None && underlying.nextIndex > until.get) throw new NoSuchElementException;
-        if (from != None && underlying.previousIndex < from.get) throw new NoSuchElementException;
-        underlying.remove;
-      }
-      def nextIndex = {
-        val ret = underlying.nextIndex;
-        if (until != None && ret >= until.get) throw new NoSuchElementException;
-        if (from != None) ret - from.get;
-        else ret;
-      }
-      def previousIndex = {
-        val ret = underlying.previousIndex;
-        if (from != None && ret < from.get) throw new NoSuchElementException;
-        if (from != None) ret - from.get;
-        else ret;
-      }
-    }
-  }
-  /*
-  protected class Map[B](f : A => B) extends super.Map[B](f) with Buffer.Projection[B] {
-    override def elements = Buffer.this.elements.map[B](f);
-    //override def apply(idx : Int) = f(MutableSeq.this.apply(idx));
-    //override def size = length;
-  }
-  */
-}
-object Buffer {
-  def apply[T](list : java.util.List[T]) = new BufferWrapper[T] {
-    val underlying = list
-  }
-
-  trait Projection0[A] extends MutableSeq.Projection[A] with RandomAccessSeq.Projection[A] {
-    override def projection : Projection0[A] = this
-    override def elements : SeqIterator[Int,A] = new DefaultSeqIterator
-
-    protected class MapProjection[B](f : A => B) extends super.MapProjection[B](f) with Projection0[B] {
-      override def projection = this
-    }
-    override def map[B](f: A => B) : Projection0[B] = new MapProjection[B](f)
-  }
-  class Projection[A] extends Collection.Projection[A] with RandomAccessSeq.MutableProjection[A] with Projection0[A] with Buffer[A] {
-    override def elements : BufferIterator[Int,A] = new DefaultBufferIterator
-    override def projection : Buffer.Projection[A] = this
-  }
-}
diff --git a/src/library/scala/collection/jcl/BufferIterator.scala b/src/library/scala/collection/jcl/BufferIterator.scala
deleted file mode 100644
index d9e07d0e23..0000000000
--- a/src/library/scala/collection/jcl/BufferIterator.scala
+++ /dev/null
@@ -1,31 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** An iterator for a buffer that supports element update and insertion.
- *
- *  @author Sean McDirmid
- */
-trait BufferIterator[K,A] extends SeqIterator[K,A] {
-
-  /** Sets the element before this iterator's cursor to "a."
-   *  Replaces either the last element returned by "next" or,
-   *  if previous was called,
-   *  the next element that would be return by "previous."
-   */
-  def set(a: A): Unit;
-
-  /** Inserts "a" after the iterator's cursor.
-   *  If next was last called, "a" is inserted after the element returned.
-   *  If previous was last called, "a" is inserted before the element returned.
-   */
-  def add(a: A): Unit;
-}
diff --git a/src/library/scala/collection/jcl/BufferWrapper.scala b/src/library/scala/collection/jcl/BufferWrapper.scala
deleted file mode 100644
index c422bb6448..0000000000
--- a/src/library/scala/collection/jcl/BufferWrapper.scala
+++ /dev/null
@@ -1,52 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Wraps Java lists.
- *
- *  @author Sean McDirmid
- */
-trait BufferWrapper[A] extends Buffer[A] with CollectionWrapper[A] {
-  def underlying : java.util.List[A];
-  override def elements : BufferIterator[Int,A] = new IteratorWrapper(underlying.listIterator);
-  override def remove(idx : Int) = underlying.remove(idx).asInstanceOf[A];
-  override def add(a : A) = underlying.add(a);
-  override def add(idx : Int, a : A) = underlying.add(idx,a);
-  override def addAll(idx : Int, that : Iterable[A]) = that match {
-  case that : CollectionWrapper[_] => underlying.addAll(idx, that.underlying); {}
-  case _ => super.addAll(idx, that);
-  }
-  override def indexOf(a : A) = {
-    val result = underlying.indexOf(a);
-    if (result == -1) None;
-    else Some(result);
-  }
-  override def apply(idx : Int) = underlying.get(idx).asInstanceOf[A];
-  override def set(idx : Int, a : A) = underlying.set(idx, a).asInstanceOf[A];
-  override def rangeImpl(from : Option[Int], until : Option[Int]) : Buffer[A] = new Range(from, until);
-  protected class Range(from : Option[Int], until : Option[Int]) extends super.Range(from,until) with BufferWrapper[A] {
-    val underlying = {
-      val fromi = if (from == None) 0 else from.get;
-      val toi = if (until == None) BufferWrapper.this.size else until.get;
-      BufferWrapper.this.underlying.subList(fromi, toi);
-    }
-    override def elements = super[BufferWrapper].elements;
-  }
-  class IteratorWrapper(underlying : java.util.ListIterator[A]) extends MutableIterator.Wrapper[A](underlying) with BufferIterator[Int,A] {
-    def add(a : A) = underlying.add(a);
-    def set(a : A) = underlying.set(a);
-    def hasPrevious = underlying.hasPrevious;
-    def previous = underlying.previous.asInstanceOf[A];
-    def previousIndex = underlying.previousIndex;
-    def nextIndex = underlying.nextIndex;
-  }
-  override def length = underlying.size;
-}
diff --git a/src/library/scala/collection/jcl/Collection.scala b/src/library/scala/collection/jcl/Collection.scala
deleted file mode 100644
index 670899f358..0000000000
--- a/src/library/scala/collection/jcl/Collection.scala
+++ /dev/null
@@ -1,67 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-object Collection {
-  val DEFAULT_FILTER : Any => Boolean = x => true;
-  trait Projection[A] extends Collection[A] with MutableIterable.Projection[A] {
-    override def projection = this
-  }
-}
-
-/** Analogous to a Java collection.
- *
- *  @author Sean McDirmid
- */
-trait Collection[A] extends MutableIterable[A] {
-  /** Type-safe version of containsAll.
-   **
-   ** @author Sean McDirmid
-   **/
-  def hasAll(i: Iterable[A]): Boolean = i.forall(elements.has);
-
-  /** Adds "a" to the collection, return true if "a" is actually added. */
-  def add(a: A): Boolean;
-
-  /** Adds all elements in "i" to the collection, return true if any elements are added. */
-  def addAll(i: Iterable[A]): Boolean = {
-    var changed = false;
-    i.foreach(t => changed = add(t) || changed);
-    changed;
-  }
-  /** Operator shortcut for addAll. */
-  def ++(that: Iterable[A]): this.type = {
-    addAll(that); this;
-  }
-
-  /** removes "a" from the collection. */
-  def -=(a : A) : Unit = remove(a);
-
-  /** adds "a" from the collection. */
-  def +=(t : A) : Unit = add(t);
-
-  /** adds "a" from the collection. Useful for chaining. */
-  def +(t : A) : this.type = { add(t); this; }
-
-  /** Transforms each element of the collection in-place according to
-   *  <code>f</code>.
-   *
-   *  @param  f
-   *  @return <code>true</code> if the collection is actually updated.
-   */
-  def transform(f: A => A): Boolean
-  override def projection : Collection.Projection[A] = new Collection.Projection[A] {
-    override def elements = Collection.this.elements
-    override def size = Collection.this.size
-    override def add(a: A): Boolean = Collection.this.add(a)
-    override def transform(f : A => A) = Collection.this.transform(f);
-  }
-}
diff --git a/src/library/scala/collection/jcl/CollectionWrapper.scala b/src/library/scala/collection/jcl/CollectionWrapper.scala
deleted file mode 100644
index 028dbee8d4..0000000000
--- a/src/library/scala/collection/jcl/CollectionWrapper.scala
+++ /dev/null
@@ -1,43 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Used to wrap Java collections in Scala.
- *
- *  @author Sean McDirmid
- */
-trait CollectionWrapper[A] extends Collection[A] with IterableWrapper[A] {
-  /** Override to specify the collection being accessed through this wrapper.
-   ** Collection operations are then routed through the wrapped Java collection.
-   **/
-  def underlying : java.util.Collection[A];
-  override def has(a : A) = underlying.contains(a);
-  override def elements : MutableIterator[A] = super.elements;
-  override def size = underlying.size;
-
-  override def hasAll(that : Iterable[A]) = that match {
-  case that : CollectionWrapper[_] =>
-    val u = underlying;
-    u.containsAll(that.underlying);
-  case _ => super.hasAll(that);
-  }
-  override def add(a : A) = underlying.add(a);
-  override def addAll(that : Iterable[A]) = that match {
-  case that : CollectionWrapper[_] => underlying.addAll(that.underlying);
-  case _ => super.addAll(that);
-  }
-  override def toString = underlying.toString;
-  override def hashCode = underlying.hashCode;
-  override def equals(that : Any) = that match {
-    case that: CollectionWrapper[_] => underlying == that.underlying;
-    case _ => super.equals(that);
-  }
-}
diff --git a/src/library/scala/collection/jcl/Conversions.scala b/src/library/scala/collection/jcl/Conversions.scala
deleted file mode 100644
index edb96322b6..0000000000
--- a/src/library/scala/collection/jcl/Conversions.scala
+++ /dev/null
@@ -1,17 +0,0 @@
-package scala.collection.jcl
-
-object Conversions {
-  implicit def convertSet[T](set : java.util.Set[T]) = Set(set)
-  implicit def convertList[T](set : java.util.List[T]) = Buffer(set)
-  implicit def convertSortedSet[T](set : java.util.SortedSet[T]) = SortedSet(set)
-  implicit def convertMap[T,E](set : java.util.Map[T,E]) = Map(set)
-  implicit def convertSortedMap[T,E](set : java.util.SortedMap[T,E]) = SortedMap(set)
-
-  implicit def unconvertSet[T](set : SetWrapper[T]) = set.underlying
-  implicit def unconvertCollection[T](set : CollectionWrapper[T]) = set.underlying
-  implicit def unconvertList[T](set : BufferWrapper[T]) = set.underlying
-  implicit def unconvertSortedSet[T](set : SortedSetWrapper[T]) = set.underlying
-  implicit def unconvertMap[T,E](set : MapWrapper[T,E]) = set.underlying
-  implicit def unconvertSortedMap[T,E](set : SortedMapWrapper[T,E]) = set.underlying
-
-}
\ No newline at end of file
diff --git a/src/library/scala/collection/jcl/HashMap.scala b/src/library/scala/collection/jcl/HashMap.scala
deleted file mode 100644
index 050da57cff..0000000000
--- a/src/library/scala/collection/jcl/HashMap.scala
+++ /dev/null
@@ -1,21 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A map that is backed by a Java hash map.
- *
- *  @author Sean McDirmid
- */
-class HashMap[K, E](override val underlying: java.util.HashMap[K, E]) extends MapWrapper[K, E] {
-  def this() = this(new java.util.HashMap[K, E])
-  override def clone: HashMap[K, E] =
-    new HashMap[K, E](underlying.clone().asInstanceOf[java.util.HashMap[K, E]])
-}
diff --git a/src/library/scala/collection/jcl/Hashtable.scala b/src/library/scala/collection/jcl/Hashtable.scala
deleted file mode 100644
index 474a3740e4..0000000000
--- a/src/library/scala/collection/jcl/Hashtable.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A hash set that is backed by a Java hash table.
- *
- *  @author Sean McDirmid
- */
-class Hashtable[K,E](override val underlying: java.util.Hashtable[K,E]) extends MapWrapper[K,E] {
-  def this() = this(new java.util.Hashtable[K,E])
-
-  override def clone() : Hashtable[K,E] =
-    new Hashtable[K,E](underlying.clone().asInstanceOf[java.util.Hashtable[K,E]])
-}
diff --git a/src/library/scala/collection/jcl/IdentityHashMap.scala b/src/library/scala/collection/jcl/IdentityHashMap.scala
deleted file mode 100644
index d8ee237777..0000000000
--- a/src/library/scala/collection/jcl/IdentityHashMap.scala
+++ /dev/null
@@ -1,24 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A map that is backed by a Java identity hash map, which compares keys
- *  by their reference-based identity as opposed to using equals and hashCode.
- *  An identity hash map will often perform better than traditional hash map
- *  because it can utilize linear probing.
- *
- *  @author Sean McDirmid
- */
-class IdentityHashMap[K, E](override val underlying : java.util.IdentityHashMap[K, E]) extends MapWrapper[K, E] {
-  def this() = this(new java.util.IdentityHashMap[K, E])
-  override def clone: IdentityHashMap[K, E] =
-    new IdentityHashMap[K, E](underlying.clone().asInstanceOf[java.util.IdentityHashMap[K, E]])
-}
diff --git a/src/library/scala/collection/jcl/IterableWrapper.scala b/src/library/scala/collection/jcl/IterableWrapper.scala
deleted file mode 100644
index 0836350ee3..0000000000
--- a/src/library/scala/collection/jcl/IterableWrapper.scala
+++ /dev/null
@@ -1,32 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** A wrapper around a Java collection that only supports remove mutations.
- *
- *  @author Sean McDirmid
- */
-trait IterableWrapper[A] extends MutableIterable[A] {
-  def underlying: java.util.Collection[A];
-  override def remove(a: A) = underlying.remove(a);
-  override def removeAll(that: Iterable[A]) = that match {
-    case that: IterableWrapper[_] => underlying.removeAll(that.underlying);
-    case _ => super.removeAll(that);
-  }
-  override def retainAll(that : Iterable[A]) = that match {
-    case that : IterableWrapper[_] => underlying.retainAll(that.underlying);
-    case _ => super.retainAll(that);
-  }
-  override def size = underlying.size;
-  override def isEmpty = underlying.isEmpty;
-  override def clear = underlying.clear;
-  override def elements : MutableIterator[A] = new MutableIterator.Wrapper[A](underlying.iterator);
-}
diff --git a/src/library/scala/collection/jcl/LinkedHashMap.scala b/src/library/scala/collection/jcl/LinkedHashMap.scala
deleted file mode 100644
index 039e88ca1c..0000000000
--- a/src/library/scala/collection/jcl/LinkedHashMap.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A map that is backed by a Java linked hash map, which fixes iteration
- *  order in terms of insertion order.
- *
- *  @author Sean McDirmid
- */
-class LinkedHashMap[K, E](override val underlying: java.util.LinkedHashMap[K, E]) extends MapWrapper[K, E] {
-  def this() = this(new java.util.LinkedHashMap[K, E])
-  override def clone: LinkedHashMap[K, E] =
-    new LinkedHashMap[K, E](underlying.clone().asInstanceOf[java.util.LinkedHashMap[K, E]])
-}
diff --git a/src/library/scala/collection/jcl/LinkedHashSet.scala b/src/library/scala/collection/jcl/LinkedHashSet.scala
deleted file mode 100644
index 272c1dd267..0000000000
--- a/src/library/scala/collection/jcl/LinkedHashSet.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A set that is backed by a Java linked hash set, which fixes iteration
- *  order in terms of insertion order.
- *
- *  @author Sean McDirmid
- */
-class LinkedHashSet[A](override val underlying: java.util.LinkedHashSet[A]) extends SetWrapper[A] {
-  def this() = this(new java.util.LinkedHashSet[A])
-  override def clone: LinkedHashSet[A] =
-    new LinkedHashSet[A](underlying.clone().asInstanceOf[java.util.LinkedHashSet[A]])
-}
diff --git a/src/library/scala/collection/jcl/LinkedList.scala b/src/library/scala/collection/jcl/LinkedList.scala
deleted file mode 100644
index 7b7c8cde2c..0000000000
--- a/src/library/scala/collection/jcl/LinkedList.scala
+++ /dev/null
@@ -1,32 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Creates a buffer backed by a Java linked list. Includes additional
- *  peek/poll/removeFirst/removeLast APIs that are useful in implementing
- *  queues and stacks.
- *
- *  @author Sean McDirmid
- */
-class LinkedList[A](override val underlying : java.util.LinkedList[A]) extends BufferWrapper[A]  {
-  def this() = this(new java.util.LinkedList[A]);
-  override def elements = super[BufferWrapper].elements;
-  override def add(idx : Int, a : A) =
-    if (idx == 0) underlying.addFirst(a);
-    else super.add(idx, a);
-  //def peek = underlying.peek.asInstanceOf[A];
-  //def poll = underlying.poll.asInstanceOf[A];
-  //def removeFirst = underlying.removeFirst.asInstanceOf[A];
-  //def removeLast  = underlying.removeLast.asInstanceOf[A];
-
-  override def clone: LinkedList[A] =
-    new LinkedList[A](underlying.clone().asInstanceOf[java.util.LinkedList[A]])
-}
diff --git a/src/library/scala/collection/jcl/Map.scala b/src/library/scala/collection/jcl/Map.scala
deleted file mode 100644
index 22124eabb3..0000000000
--- a/src/library/scala/collection/jcl/Map.scala
+++ /dev/null
@@ -1,129 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** A mutable map that is compatible with Java maps.
- *
- *  @author Sean McDirmid
- */
-trait Map[K,E] extends MutableIterable[Tuple2[K,E]] with scala.collection.mutable.Map[K,E] {
-  override def clear() = super[MutableIterable].clear;
-  override def isEmpty = super[MutableIterable].isEmpty;
-  override def keySet : Set[K] = new KeySet;
-  override final def keys = keySet.elements;
-  /** The values of this map as a projection, which means
-      removals from the returned collection will remove the element from this map.
-      @returns a projection of this map's elements.  */
-  def valueSet : MutableIterable.Projection[E] = projection.map(_._2);
-
-  override def put(key : K, elem : E) : Option[E] = throw new java.lang.AbstractMethodError
-
-  override def ++=(that : Iterable[(K,E)]) : Unit =
-    that.foreach(p => put(p._1, p._2));
-
-  override def removeKey(key : K) : Option[E] = {
-    val i = elements;
-    while (!i.hasNext) {
-      val result = i.next;
-      if (result._1 == key) {
-        i.remove;
-        return Some(result._2);
-      }
-    }
-    return None;
-  }
-  override def has(pair : Tuple2[K,E]) = get(pair._1) match {
-  case Some(e) if e == pair._2 => true;
-  case _ => false;
-  }
-  override def get(key : K) = elements.find(p => p._1 == key).map(_._2);
-  override def update(key : K, e : E) : Unit = put(key,e);
-  override def +(pair : Tuple2[K,E]) : this.type = {
-    put(pair._1,pair._2); this;
-  }
-  override def +=(pair : Tuple2[K,E]) : Unit = put(pair._1, pair._2);
-  override def -(key : K) : this.type = {
-    removeKey(key); this;
-  }
-  override def remove(p : (K,E)) = get(p._1) match {
-  case Some(p._2) => this -= p._1; true
-  case _ => false;
-  }
-
-  override def -=(key : K) : Unit = removeKey(key);
-  override def elements : MutableIterator[Tuple2[K,E]];
-
-  override def projection : Map.Projection[K,E] = new Map.Projection[K,E] {
-    override def elements = Map.this.elements
-    override def size = Map.this.size
-    override def get(k : K) = Map.this.get(k)
-    override def put(k : K, e : E) = Map.this.put(k, e)
-  }
-  /**
-   */
-  def lense[F](f : E => F, g : F => E) : jcl.Map.Projection[K,F] = new Lense[F](f,g);
-
-  protected class Lense[F](f : E => F, g : F => E) extends jcl.Map.Projection[K,F] {
-    override def elements = Map.this.elements.map(k => Tuple2(k._1, f(k._2)));
-    override def removeKey(key : K) = Map.this.removeKey(key).map(f);
-    override def put(key : K, elem : F) = Map.this.put(key, g(elem)).map(f);
-    override def get(key : K) = Map.this.get(key).map(f);
-    override def lense[G](f0 : F => G, g0 : G => F) : jcl.Map.Projection[K,G] =
-      Map.this.lense[G](x => f0(f(x)), y => g(g0(y)));
-    override def size = size0;
-  }
-  protected class KeySet extends Set[K] {
-    override def size = Map.this.size;
-    override def add(k : K) = Map.this.put(k, default(k)) == None;
-    override def elements = Map.this.elements.map(_._1);
-    override def has(k : K) = Map.this.contains(k);
-  }
-  override def filterKeys(p : K => Boolean) : Map.Projection[K,E] = new Filter(p);
-
-  protected class Filter(p : K => Boolean) extends Map.Projection[K,E] {
-    override def elements = {
-      val i = Map.this.elements.filter(e => p(e._1));
-      new MutableIterator[(K,E)] {
-        def next = i.next
-        def hasNext = i.hasNext
-        def remove : Unit = throw new NoSuchMethodException
-      }
-    }
-   override def removeKey(key : K) = {
-      if (!p(key)) throw new IllegalArgumentException;
-      Map.this.removeKey(key);
-    }
-    override def contains(key : K) = p(key) && Map.this.contains(key);
-    override def put(key : K, elem : E) = {
-      if (!p(key)) throw new IllegalArgumentException;
-      Map.this.put(key, elem);
-    }
-    override def get(key : K) = {
-      if (!p(key)) None;
-      else Map.this.get(key);
-    }
-    override def filterKeys(p0 : K => Boolean) : Map.Projection[K,E] =
-      Map.this.filterKeys(e => p(e) && p0(e));
-
-    override def size = size0;
-  }
-}
-
-object Map {
-  trait MutableIterableProjection[A] extends MutableIterable.Projection[A];
-  trait Projection[K,E] extends MutableIterableProjection[(K,E)] with scala.collection.Map.Projection[K,E] with Map[K,E] {
-    override def projection = this
-    override def map[B](f : ((K,E)) => B) : MutableIterable.Projection[B] = super[MutableIterableProjection].map(f);
-  }
-  def apply[T,E](map0 : java.util.Map[T,E]) = new MapWrapper[T,E] {
-    val underlying = map0
-  }
-}
diff --git a/src/library/scala/collection/jcl/MapWrapper.scala b/src/library/scala/collection/jcl/MapWrapper.scala
deleted file mode 100644
index e8b39e8886..0000000000
--- a/src/library/scala/collection/jcl/MapWrapper.scala
+++ /dev/null
@@ -1,76 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A wrapper around a Java map.
- *
- *  @author Sean McDirmid
- */
-trait MapWrapper[K, E] extends jcl.Map[K, E] {
-  def underlying: java.util.Map[K, E]
-  override def size = underlying.size
-  override def isEmpty = underlying.isEmpty
-  override def clear() = underlying.clear
-
-  override def put(key: K, elem: E) = {
-    //if (elem == null) throw new IllegalArgumentException;
-    val ret = underlying.put(key, elem)
-    if (ret == null) None else Some(ret.asInstanceOf[E])
-  }
-
-  override def get(key : K) : Option[E] = {
-    val ret = underlying.get(key);
-    if (ret == null) None else Some(ret.asInstanceOf[E]);
-  }
-
-  override def ++=(that : Iterable[Tuple2[K,E]]) : Unit = that match {
-    case that : MapWrapper[_,_] => underlying.putAll(that.underlying);
-    case _ => super.++=(that)
-  }
-
-  override def removeKey(key: K) = {
-    val ret = underlying.remove(key)
-    if (ret == null) None else Some(ret.asInstanceOf[E])
-  }
-
-  override def contains(key: K) = underlying.containsKey(key)
-  override def keySet: Set.Projection[K] = new KeySet
-  override def valueSet: MutableIterable.Projection[E] = new ValueSet
-  override def elements: MutableIterator[Tuple2[K,E]] = new IteratorWrapper
-
-  class IteratorWrapper extends MutableIterator[Tuple2[K,E]] {
-    val underlying = MapWrapper.this.underlying.entrySet.iterator
-    def hasNext = underlying.hasNext
-    def remove = underlying.remove
-    def next = {
-      val next = underlying.next.asInstanceOf[java.util.Map.Entry[K,E]]
-      Tuple2(next.getKey.asInstanceOf[K],next.getValue.asInstanceOf[E])
-    }
-  }
-
-  class KeySet extends super.KeySet with SetWrapper[K] with Set.Projection[K] {
-    val underlying = MapWrapper.this.underlying.keySet
-  }
-
-  class ValueSet extends IterableWrapper[E] with MutableIterable.Projection[E] {
-    override def size = MapWrapper.this.size
-    val underlying = MapWrapper.this.underlying.values
-    override def has(e : E) = MapWrapper.this.underlying.containsValue(e)
-  }
-
-  override def toString = underlying.toString
-  override def hashCode = underlying.hashCode
-
-  override def equals(that : Any) = that match {
-    case that: MapWrapper[_,_] => underlying == that.underlying
-    case _ => super.equals(that)
-  }
-}
diff --git a/src/library/scala/collection/jcl/MutableIterable.scala b/src/library/scala/collection/jcl/MutableIterable.scala
deleted file mode 100644
index 9a7d078d29..0000000000
--- a/src/library/scala/collection/jcl/MutableIterable.scala
+++ /dev/null
@@ -1,110 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/**
- * An iterable collection that supports remove operations.
- * Useful for representing projections of mutable collections that where only
- * the remove operation makes sense.
- *
- * @author Sean McDirmid
- */
-trait MutableIterable[A] extends scala.Collection[A] {
-  /** @return true if t is in the collection.
-   **/
-  def has(t : A ) : Boolean = elements.contains(t);
-
-  /** @return true if t was removed from this collection.
-   **/
-  def remove(t : A ) : Boolean = elements.remove(t);
-  /** @return true if any element in that was removed from this collection.
-   **/
-  def removeAll(that : Iterable[A]) : Boolean = {
-    var changed = false;
-    that.foreach(t => changed = elements.remove(t) || changed);
-    changed;
-  }
-  /** Operator shortcut for removeAll. */
-  def --(that : Iterable[A]) : this.type = {
-    removeAll(that); this;
-  }
-
-  /** @return the collection that t was removed from.
-   */
-  def -(t : A) : this.type = { remove(t); this; }
-  /** retain only elements in the collection that predicate p is true for.
-   */
-  def retainOnly(p : A => Boolean) : Unit = elements.retain(p);
-  /** retain only elements that are also in that.
-   */
-  def retainAll(that : Iterable[A]) : Boolean = elements.retain(s => that.exists(t => t == s));
-
-  /** @return the current number of elements in the collection.
-   */
-  protected def size0 : Int = {
-    var count = 0;
-    val i = elements;
-    while (i.hasNext) { count = count + 1; i.next; }
-    count;
-  }
-
-  /** clear all elements from the collection.
-   */
-  def clear(): Unit = {
-    val i = elements;
-    while (i.hasNext) {
-      i.next; i.remove;
-    }
-  }
-  override def projection : MutableIterable.Projection[A] = new MutableIterable.Projection[A] {
-    override def elements = MutableIterable.this.elements
-    override def size = MutableIterable.this.size
-    override def remove(t : A ) : Boolean = MutableIterable.this.remove(t)
-    override def filter(p : A => Boolean) : MutableIterable.Projection[A] = super.filter(p)
-  }
-  /** The default implementation of a map over mutable iterable collections.
-   **/
-  override def elements : MutableIterator[A];
-  protected class Map[B](f : A => B) extends MutableIterable.Projection[B] {
-    override def elements = MutableIterable.this.elements.map(f)
-    override def size = MutableIterable.this.size
-  }
-  trait Filter extends MutableIterable.Projection[A] {
-    protected def p(a : A) : Boolean
-    override def has(a : A) = if (!p(a)) false else MutableIterable.this.has(a);
-    override def remove(a : A) = {
-      if (!p(a)) throw new IllegalArgumentException;
-      MutableIterable.this.remove(a);
-    }
-    override def filter(p0 : A => Boolean) : MutableIterable.Projection[A] =
-      MutableIterable.this.projection.filter(a => p(a) && p0(a));
-    def elements = {
-      val i = MutableIterable.this.elements.filter(p);
-      new MutableIterator[A] {
-	def next = i.next
-	def hasNext = i.hasNext
-	def remove : Unit = throw new NoSuchMethodException
-      }
-    }
-    def size = size0;
-  }
-}
-
-object MutableIterable {
-  trait Projection[A] extends MutableIterable[A] with Iterable.Projection[A] {
-    override def projection = this
-    override def map[B](f : A => B) : Projection[B] = new Map[B](f);
-    override def filter(pp : A => Boolean) : Projection[A] = new Filter {
-      def p(a : A) = pp(a)
-    }
-  }
-}
-
diff --git a/src/library/scala/collection/jcl/MutableIterator.scala b/src/library/scala/collection/jcl/MutableIterator.scala
deleted file mode 100644
index 0170939712..0000000000
--- a/src/library/scala/collection/jcl/MutableIterator.scala
+++ /dev/null
@@ -1,70 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-object MutableIterator {
-  class Wrapper[A](val underlying : java.util.Iterator[A]) extends MutableIterator[A] {
-    def hasNext = underlying.hasNext;
-    def next = underlying.next.asInstanceOf[A];
-    def remove = underlying.remove;
-  }
-}
-
-/** An iterator that supports the remove operation.
- *  These iterators wrap Java iterators, and so have the same fail fast
- *  behavior when dealing with concurrent modifications.
- *
- *  @author Sean McDirmid
- */
-trait MutableIterator[A] extends Iterator[A] {
-  def remove : Unit;
-
-  /* filter doesnt' support remove yet.
-  override def filter(f : A => Boolean) : MutableIterator[A] = {
-    val buffered = this.buffered0;
-    new buffered.Filter(f);
-  }
-  */
-
-  override def map[B](f: A => B) : MutableIterator[B] = new Map(f);
-  /** A type-safe version of contains.
-   **/
-  def has(a: A) = exists(b => a == a);
-
-  /** Finds and removes the first instance of "a" through the iterator.
-   *  After execution, the iterator's cursor is located where the removed
-   *  element existed.
-   *
-   * @param  a ..
-   * @return <code>false</code> if "a" is not encountered in the iterator
-   *         and the iterator's cursor is located at the end of its elements.
-   */
-  def remove(a: A): Boolean = {
-    while (hasNext)
-      if (next == a) { remove; return true; }
-    return false;
-  }
-  /** Removes all elements in the iterator that predicate "p" returns false on.
-   **/
-  def retain(p : A => Boolean) : Boolean = {
-    var changed = false;
-    while (hasNext)
-      if (!p(next)) { remove; changed = true; }
-    changed;
-  }
-
-  /** Standard implementation of a mapped iterator. **/
-  class Map[B](f : A => B) extends MutableIterator[B] {
-    def hasNext = MutableIterator.this.hasNext
-    def next = f(MutableIterator.this.next)
-    def remove = MutableIterator.this.remove
-  }
-}
diff --git a/src/library/scala/collection/jcl/MutableSeq.scala b/src/library/scala/collection/jcl/MutableSeq.scala
deleted file mode 100644
index 3971bc0984..0000000000
--- a/src/library/scala/collection/jcl/MutableSeq.scala
+++ /dev/null
@@ -1,123 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** A mutable sequence that supports the remove operation and is ordered.
- *
- *  @author Sean McDirmid
- */
-trait MutableSeq[A] extends Seq[A] with MutableIterable[A]  {
-  protected class DefaultSeqIterator extends SeqIterator[Int,A] {
-    protected var index = 0
-    override def hasNext = index < length
-    override def next = {
-      if (!hasNext) throw new NoSuchElementException("no lookahead")
-      index = index + 1
-      MutableSeq.this.apply(index - 1)
-    }
-    override def hasPrevious = index > 0
-    override def previous = {
-      if (!hasPrevious) throw new NoSuchElementException
-      index = index - 1
-      MutableSeq.this.apply(index)
-    }
-
-    override def nextIndex = index
-    override def previousIndex = {
-      if (index == 0) throw new NoSuchElementException
-      else index - 1
-    }
-    def remove = throw new UnsupportedOperationException
-  }
-  override def elements : SeqIterator[Int,A] = new DefaultSeqIterator
-
-  override def isEmpty = super[MutableIterable].isEmpty;
-
-  override def apply(idx : Int) = elements.seek(idx);
-  override def projection : MutableSeq.Projection[A] = new MutableSeq.Projection[A] {
-    override def length = MutableSeq.this.length
-    override def elements = MutableSeq.this.elements
-    override def apply(idx : Int) = MutableSeq.this.apply(idx)
-  }
-
-  /** Find the index of "a" in this sequence.
-   *  @returns None if the "a" is not in this sequence.
-   */
-  def indexOf(a : A) = elements.indexOf(a);
-
-  override def length = {
-    var i = elements;
-    var sz = 0;
-    while (i.hasNext) {
-      sz = sz + 1;
-      i.next;
-    }
-    sz;
-  }
-  protected trait Filter extends MutableSeq.Projection[A] {
-    protected def p(a : A) : Boolean
-    override def elements : SeqIterator[Int,A] = new FilterIterator(MutableSeq.this.elements);
-    class FilterIterator(underlying : SeqIterator[Int,A]) extends SeqIterator[Int,A] {
-      private var index = 0;
-      protected def seekNext : Option[A] = {
-        while (underlying.hasNext) {
-          val next = underlying.next;
-          if (p(next)) return Some(next);
-        }
-        return None;
-      }
-      protected def seekPrevious : Option[A] = {
-        while (underlying.hasPrevious) {
-          val previous = underlying.previous;
-          if (p(previous)) return Some(previous);
-        }
-        return None;
-      }
-      def hasNext : Boolean = seekNext match {
-      case None => false;
-      case Some(_) => underlying.previous; true;
-      }
-      def nextIndex = index;
-      def next = seekNext match {
-      case None => throw new NoSuchElementException;
-      case Some(result) => index = index + 1; result;
-      }
-      def hasPrevious : Boolean = seekPrevious match {
-      case None => false;
-      case Some(_) => underlying.previous; true;
-      }
-      def previousIndex = {
-        if (index == 0) throw new NoSuchElementException;
-        index - 1;
-      }
-      def previous = seekPrevious match {
-      case None => throw new NoSuchElementException;
-      case Some(result) => index = index - 1; result;
-      }
-      def remove = underlying.remove;
-    }
-  }
-  protected class Map[B](f : A => B) extends super.Map[B](f) with MutableSeq.Projection[B] {
-    override def elements = MutableSeq.this.elements.map(f);
-    override def apply(idx : Int) = f(MutableSeq.this.apply(idx));
-    override def size = length;
-  }
-}
-object MutableSeq {
-  trait Projection[A] extends MutableSeq[A] with MutableIterable.Projection[A] with Seq.Projection[A] {
-    override def projection = this
-    override def filter(pp : A => Boolean) : Projection[A] = new Filter {
-      override def p(a : A) = pp(a)
-    }
-    override def map[B](f : A => B) : Projection[B] = new Map[B](f);
-  }
-}
-
diff --git a/src/library/scala/collection/jcl/Ranged.scala b/src/library/scala/collection/jcl/Ranged.scala
deleted file mode 100644
index c07cc2c6c0..0000000000
--- a/src/library/scala/collection/jcl/Ranged.scala
+++ /dev/null
@@ -1,54 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Any collection (including maps) whose keys (or elements) are ordered.
- *
- *  @author Sean McDirmid
- */
-trait Ranged[K,A] extends scala.collection.Ranged[K,A] with MutableIterable[A] {
-  protected type SortedSelf <: Ranged[K,A];
-
-  /** Comparison function that orders keys. */
-  def compare(k0: K, k1: K): Int;
-
-  /** Creates a ranged projection of this collection. Any mutations in the
-   *  ranged projection will update this collection and vice versa.  Note: keys
-   *  are not garuanteed to be consistent between this collection and the projection.
-   *  This is the case for buffers where indexing is relative to the projection.
-   *
-   *  @param from  The lower-bound (inclusive) of the ranged projection.
-   *               <code>None</code> if there is no lower bound.
-   *  @param until The upper-bound (exclusive) of the ranged projection.
-   *               <code>None</code> if there is no upper bound.
-   */
-  def rangeImpl(from: Option[K], until: Option[K]) : SortedSelf;
-  /** Creates a ranged projection of this collection with no upper-bound.
-   ** @param from The lower-bound (inclusive) of the ranged projection.
-   **/
-  override final def from(from: K): SortedSelf = rangeImpl(Some(from), None);
-  /** Creates a ranged projection of this collection with no lower-bound.
-   ** @param until The upper-bound (exclusive) of the ranged projection.
-   **/
-  override final def until(until: K): SortedSelf = rangeImpl(None, Some(until));
-
-  /** Creates a ranged projection of this collection with both a lower-bound and an upper-bound.
-   ** @param from The upper-bound (exclusive) of the ranged projection.
-   **/
-  override final def range(from: K, until: K) : SortedSelf = rangeImpl(Some(from),Some(until));
-
-  /** A wrapper around Java comparators. */
-  protected class Comparator[K <% Ordered[K]] extends java.util.Comparator[Any] {
-    def compare(x0 : Any, x1 : Any) = {
-      x0.asInstanceOf[K].compare(x1.asInstanceOf[K]); //!!!
-    }
-  }
-}
diff --git a/src/library/scala/collection/jcl/SeqIterator.scala b/src/library/scala/collection/jcl/SeqIterator.scala
deleted file mode 100644
index c3d65dc2a4..0000000000
--- a/src/library/scala/collection/jcl/SeqIterator.scala
+++ /dev/null
@@ -1,58 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** An iterator for a sequence that can move both forwards and backwards.
- *  over a set of ordered keys.
- *
- *  @author Sean McDirmid
- */
-trait SeqIterator[K,A] extends MutableIterator[A] {
-  /** @returns The index at the iterator's cursor. */
-  def nextIndex: K;
-
-  /** @returns The index of the element before the iterator's cursor. */
-  def previousIndex: K;
-
-  /** @return The previous element, will move the iterator's cursor backwards. */
-  def previous: A;
-
-  /** @return True if and only if the iterator's cursor is not at the beging of the iteration. */
-  def hasPrevious : Boolean;
-
-  /** Winds the iteration forward until index "idx" is found */
-  def seek(idx: K) = {
-    while (nextIndex != idx) next;
-    next;
-  }
-  /** finds the index of the next "a" in this iteration.
-   *
-   *  @param  a ..
-   *  @return <code>None</code> if "a" is not found in the iteration.
-   */
-  def indexOf(a: A): Option[K] = {
-    while (hasNext) {
-      val ret = next;
-      if (ret == a) return Some(previousIndex);
-    }
-    return None;
-  }
-
-  override def map[B](f: A => B) : SeqIterator[K,B] = new Map[B](f);
-  class Map[B](f: A => B) extends super.Map[B](f) with SeqIterator[K,B] {
-    override def hasPrevious = SeqIterator.this.hasPrevious;
-    override def previous = f(SeqIterator.this.previous);
-    override def previousIndex = SeqIterator.this.previousIndex;
-    override def nextIndex = SeqIterator.this.nextIndex;
-    override def map[C](g : B => C) : SeqIterator[K,C] =
-      SeqIterator.this.map(a => g(f(a)));
-  }
-}
diff --git a/src/library/scala/collection/jcl/Set.scala b/src/library/scala/collection/jcl/Set.scala
deleted file mode 100644
index 3b39a07f1e..0000000000
--- a/src/library/scala/collection/jcl/Set.scala
+++ /dev/null
@@ -1,72 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** Analogous to a Java set.
- *
- *  @author Sean McDirmid
- */
-trait Set[A] extends scala.collection.mutable.Set[A] with Collection[A] {
-  final def contains(a : A) = has(a)
-
-  /** Add will return false if "a" already exists in the set. **/
-  override def add(a: A): Boolean
-
-  override def ++(i: Iterable[A]) : this.type = super[Collection].++(i)
-  override def --(i: Iterable[A]) : this.type = super[Collection].--(i)
-  override def +(t: A) : this.type = super[Collection].+(t)
-  override def -(t: A) : this.type = super[Collection].-(t)
-  override final def retain(f: A => Boolean) = retainOnly(f)
-  override def isEmpty = super[Collection].isEmpty
-  override def clear() = super.clear()
-  override def subsetOf(set : scala.collection.Set[A]) = set match {
-    case set : Set[_] => set.hasAll(this)
-    case set => super.subsetOf(set)
-  }
-
-  override def transform(f: A => A) = {
-    var toAdd : List[A] = Nil
-    val i = elements
-    while (i.hasNext) {
-      val i0 = i.next
-      val i1 = f(i0)
-      if (i0 != i1) {
-        i.remove; toAdd = i1 :: toAdd
-      }
-    }
-    addAll(toAdd)
-  }
-  class Filter(pp : A => Boolean) extends super.Filter with Set.Projection[A] {
-    override def p(a : A) = pp(a)
-    override def retainOnly(p0 : A => Boolean): Unit =
-      Set.this.retainOnly(e => !p(e) || p0(e))
-    override def add(a : A) = {
-      if (!p(a)) throw new IllegalArgumentException
-      else Set.this.add(a)
-    }
-  }
-  override def projection : Set.Projection[A] = new Set.Projection[A] {
-    override def add(a: A): Boolean = Set.this.add(a)
-    override def elements = Set.this.elements
-    override def size = Set.this.size
-    override def has(a : A) : Boolean = Set.this.has(a)
-  }
-}
-
-object Set {
-  trait Projection[A] extends Collection.Projection[A] with Set[A] {
-    override def filter(p : A => Boolean) : Projection[A] = new Filter(p);
-    override def projection = this
-  }
-  def apply[T](set : java.util.Set[T]) = new SetWrapper[T] {
-    val underlying = set
-  }
-}
diff --git a/src/library/scala/collection/jcl/SetWrapper.scala b/src/library/scala/collection/jcl/SetWrapper.scala
deleted file mode 100644
index 74697b20aa..0000000000
--- a/src/library/scala/collection/jcl/SetWrapper.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Used to wrap Java sets.
- *
- *  @author Sean McDirmid
- */
-trait SetWrapper[A] extends Set[A] with CollectionWrapper[A] {
-  def underlying: java.util.Set[A];
-  override def isEmpty = super[CollectionWrapper].isEmpty;
-  override def clear() = super[CollectionWrapper].clear;
-  override def size = underlying.size;
-}
diff --git a/src/library/scala/collection/jcl/Sorted.scala b/src/library/scala/collection/jcl/Sorted.scala
deleted file mode 100644
index daaffc943c..0000000000
--- a/src/library/scala/collection/jcl/Sorted.scala
+++ /dev/null
@@ -1,46 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** Any collection (including maps) whose keys (or elements) are ordered.
- *
- *  @author Sean McDirmid
- */
-trait Sorted[K,A] extends scala.collection.Sorted[K,A] with Ranged[K,A] {
-  override protected type SortedSelf <: Sorted[K,A];
-  /** return as a projection the set of keys in this collection */
-  override def keySet : SortedSet[K];
-
-  /** Creates a ranged projection of this collection. Any mutations in the
-   *  ranged projection will update this collection and vice versa.  Keys
-   *  are garuanteed to be consistent between the collection and its projection.
-   *
-   *  @param from  The lower-bound (inclusive) of the ranged projection.
-   *               <code>None</code> if there is no lower bound.
-   *  @param until The upper-bound (exclusive) of the ranged projection.
-   *               <code>None</code> if there is no upper bound.
-   */
-  override def rangeImpl(from: Option[K], until: Option[K]) : SortedSelf;
-
-  /** Create a range projection of this collection with no lower-bound.
-   ** @param to The upper-bound (inclusive) of the ranged projection.
-   **/
-  final override def to(to : K): SortedSelf = {
-    // tough!
-    val i = keySet.from(to).elements;
-    if (!i.hasNext) return this.asInstanceOf[SortedSelf];
-    val next = i.next;
-    if (next == to) {
-      if (!i.hasNext) return this.asInstanceOf[SortedSelf];
-      else return until(i.next);
-    } else return until(next);
-  }
-}
diff --git a/src/library/scala/collection/jcl/SortedMap.scala b/src/library/scala/collection/jcl/SortedMap.scala
deleted file mode 100644
index 64091b42fd..0000000000
--- a/src/library/scala/collection/jcl/SortedMap.scala
+++ /dev/null
@@ -1,103 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-object SortedMap {
-  trait Projection[K,E] extends Map.Projection[K,E] with SortedMap[K,E] {
-    override def projection = this
-  }
-  def apply[T,E](map0 : java.util.SortedMap[T,E]) = new SortedMapWrapper[T,E] {
-    val underlying = map0
-  }
-}
-/** A map whose keys are sorted.
- *
- *  @author Sean McDirmid
- */
-trait SortedMap[K,E] extends scala.collection.SortedMap[K,E] with Map[K,E] with Sorted[K,Tuple2[K,E]] {
-  final protected type SortedSelf = SortedMap[K,E];
-  override def compare(k0 : K, k1 : K) : Int;
-  override def firstKey : K = elements.next._1;
-  override def lastKey : K = {
-    val i = elements;
-    var last : K = i.next._1;
-    while (i.hasNext) last = i.next._1;
-    last;
-  }
-  override def rangeImpl(from : Option[K], until : Option[K]) : SortedMap[K,E] = Range(from, until);
-  override def keySet : SortedSet.Projection[K] = new KeySet;
-
-  override def projection : SortedMap.Projection[K,E] = new SortedMap.Projection[K,E] {
-    override def elements = SortedMap.this.elements
-    override def size = SortedMap.this.size
-    override def get(k : K) = SortedMap.this.get(k)
-    override def put(k : K, e : E) = SortedMap.this.put(k, e)
-    override def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0, k1)
-  }
-
-  override def lense[F](f : E => F, g : F => E) : jcl.SortedMap.Projection[K,F] = new Lense[F](f,g);
-
-  protected class Lense[F](f : E => F, g : F => E) extends super.Lense[F](f,g) with SortedMap.Projection[K,F] {
-    def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0, k1);
-    override def filterKeys(p : K => Boolean) : SortedMap.Projection[K,F] =
-      SortedMap.this.projection.filterKeys(p).lense(f,g);
-    override def lense[G](f0 : F => G, g0 : G => F) : jcl.SortedMap.Projection[K,G] =
-      SortedMap.this.lense[G]({x:E => f0(f(x))}, {y:G => g(g0(y))});
-    override def rangeImpl(from : Option[K], until : Option[K]) =
-      SortedMap.this.rangeImpl(from,until).lense(f,g);
-  }
-  protected class KeySet extends super.KeySet with SortedSet.Projection[K] {
-    def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0,k1);
-    override def firstKey = SortedMap.this.firstKey;
-    override def lastKey = SortedMap.this.lastKey;
-    override def rangeImpl(from : Option[K], until : Option[K]) =
-      SortedMap.this.rangeImpl(from,until).keySet;
-  }
-  override def filterKeys(p : K => Boolean) : SortedMap.Projection[K,E] = new Filter(p);
-  protected class Filter(p : K => Boolean) extends super.Filter(p) with SortedMap.Projection[K,E] {
-    def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0,k1);
-    override def filterKeys(p0 : K => Boolean) : SortedMap.Projection[K,E] =
-      SortedMap.this.filterKeys(k => p(k) && p0(k));
-    override def rangeImpl(from : Option[K], until : Option[K]) : SortedMap.Projection[K,E] =
-      SortedMap.this.Range(from, until).projection.filterKeys(p);
-  }
-  protected def Range(from : Option[K], until : Option[K]) : SortedMap.Projection[K,E] = new Range(from,until);
-  protected class Range(from : Option[K], until : Option[K]) extends super.Filter(key => {
-    ((from == None || (compare(from.get,key) <= 0)) &&
-      (until == None || (compare(key,until.get) < 0)));
-  }) with SortedMap.Projection[K,E] {
-    def compare(k0 : K, k1 : K) = SortedMap.this.compare(k0,k1);
-    private def contains0(key : K) =
-      (from == None || (compare(from.get,key) <= 0)) &&
-        (until == None || (compare(key,until.get) < 0));
-
-    override def contains(key : K) = SortedMap.this.contains(key) && contains0(key);
-    override def get(key : K) = if (!contains0(key)) None else SortedMap.this.get(key);
-    override def put(key : K, elem : E) = {
-      if (!contains0(key)) throw new IllegalArgumentException;
-      SortedMap.this.put(key, elem);
-    }
-    override def rangeImpl(from : Option[K], until : Option[K]) : SortedMap[K,E] = {
-      if (this.from != None && from == None) return rangeImpl(this.from, until);
-      if (this.until != None && until == None) return rangeImpl(from, this.until);
-      if (from != None && compare(this.from.get, from.get) > 0) return rangeImpl(this.from, until);
-      if (until != None && compare(this.until.get, until.get) < 0) return rangeImpl(from, this.until);
-      SortedMap.this.Range(from, until);
-    }
-    override def filterKeys(p : K => Boolean) : SortedMap.Projection[K,E] = new Filter(p);
-    protected class Filter(p : K => Boolean) extends super.Filter(p) with SortedMap.Projection[K,E] {
-      //def compare(k0 : K, k1 : K) = Range.this.compare(k0, k1);
-      override def filterKeys(p0 : K => Boolean) = Range.this.projection.filterKeys(k => p(k) && p0(k));
-      override def rangeImpl(from : Option[K], until : Option[K]) : SortedMap.Projection[K,E] =
-        Range.this.rangeImpl(from,until).projection.filterKeys(p);
-    }
-  }
-}
diff --git a/src/library/scala/collection/jcl/SortedMapWrapper.scala b/src/library/scala/collection/jcl/SortedMapWrapper.scala
deleted file mode 100644
index e4edff0f82..0000000000
--- a/src/library/scala/collection/jcl/SortedMapWrapper.scala
+++ /dev/null
@@ -1,39 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** A sorted map that wraps an underlying Java sorted map.
- *
- *  @author Sean McDirmid
- */
-trait SortedMapWrapper[K,E] extends SortedMap[K,E] with MapWrapper[K,E] {
-  override def underlying : java.util.SortedMap[K,E];
-  /** the comparator function of this sorted map is defined in terms
-    * of the underlying sorted map's comparator.
-    */
-  def compare(k0 : K, k1 : K) = underlying.comparator.compare(k0,k1);
-  override def firstKey = underlying.firstKey.asInstanceOf[K];
-  override def lastKey = underlying.lastKey.asInstanceOf[K];
-  override def keySet : SortedSet.Projection[K] = new KeySet;
-  override protected def Range(from : Option[K], until : Option[K]) = new Range(from,until);
-  protected class Range(from : Option[K], until : Option[K]) extends super.Range(from,until) with SortedMapWrapper[K,E] {
-    val underlying = Tuple2(from,until) match {
-    case Tuple2(None,None) => throw new IllegalArgumentException;
-    case Tuple2(Some(from),None) => SortedMapWrapper.this.underlying.tailMap(from);
-    case Tuple2(None,Some(until)) => SortedMapWrapper.this.underlying.headMap(until);
-    case Tuple2(Some(from),Some(until)) => SortedMapWrapper.this.underlying.subMap(from,until);
-    }
-    override def compare(k0 : K, k1 : K) = super[SortedMapWrapper].compare(k0, k1);
-  }
-  protected class KeySet extends super[SortedMap].KeySet with SetWrapper[K] with SortedSet.Projection[K] {
-    val underlying = SortedMapWrapper.this.underlying.keySet;
-  }
-}
diff --git a/src/library/scala/collection/jcl/SortedSet.scala b/src/library/scala/collection/jcl/SortedSet.scala
deleted file mode 100644
index f658ffae0a..0000000000
--- a/src/library/scala/collection/jcl/SortedSet.scala
+++ /dev/null
@@ -1,99 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-import Predef._
-
-object SortedSet {
-  trait Projection[A] extends Set.Projection[A] with SortedSet[A] {
-    override def projection = this
-    override def filter(p : A => Boolean) : Projection[A] = new Filter(p);
-  }
-  def apply[T](set : java.util.SortedSet[T]) = new SortedSetWrapper[T] {
-    val underlying = set
-  }
-
-}
-
-/** Analogous to a Java sorted set.
- *
- *  @author Sean McDirmid
- */
-trait SortedSet[A] extends scala.collection.SortedSet[A] with jcl.Set[A] with Sorted[A,A] {
-  final protected type SortedSelf = SortedSet[A];
-  override def keySet = this;
-  def compare(a0 : A, a1 : A) : Int;
-  override def firstKey : A = {
-    val i = elements;
-    if (i.hasNext) i.next;
-    else throw new NoSuchElementException;
-  }
-  override def subsetOf(that : scala.collection.Set[A]) = super[SortedSet].subsetOf(that);
-  override def hasAll(that : Iterable[A]) = super[Sorted].hasAll(that.elements);
-
-  override def lastKey : A = {
-    var last : A = null.asInstanceOf[A];
-    val i = elements;
-    while (i.hasNext) last = i.next;
-    if (last == null) throw new NoSuchElementException;
-    else last;
-  }
-  override def rangeImpl(from : Option[A], until : Option[A]) : SortedSet[A] = new Range(from, until);
-  override def projection : SortedSet.Projection[A] = new SortedSet.Projection[A] {
-    override def compare(a0 : A, a1 : A) = SortedSet.this.compare(a0, a1)
-    override def add(a: A): Boolean = SortedSet.this.add(a)
-    override def elements = SortedSet.this.elements
-    override def size = SortedSet.this.size
-    override def has(a : A) : Boolean = SortedSet.this.has(a)
-  }
-
-  protected class Filter(pp : A => Boolean) extends super.Filter(pp) with SortedSet.Projection[A] {
-    override def p(a : A) = pp(a)
-    def compare(a0 : A, a1 : A) : Int = SortedSet.this.compare(a0, a1);
-    override def filter(p0 : A => Boolean) = SortedSet.this.projection.filter(k => p(k) && p0(k));
-  }
-  protected class Range(from : Option[A], until : Option[A]) extends Filter(key => {
-    (from == None || (compare(from.get,key) <= 0)) &&
-      (until == None || (compare(key,until.get) < 0));
-  }) with SortedSet.Projection[A] {
-    if (from == None && until == None) throw new IllegalArgumentException;
-    if (from != None && until != None && !(SortedSet.this.compare(from.get, until.get) < 0))
-      throw new IllegalArgumentException;
-    //override def elements : MutableIterator[A] =
-    //  new RangeIterator(SortedSet.this.elements.buffered0);
-    private def contains1(key : A) =
-      (from == None || (compare(from.get,key) <= 0)) &&
-        (until == None || (compare(key,until.get) < 0));
-    override def has(elem : A) = contains1(elem) && SortedSet.this.has(elem);
-    override def rangeImpl(from : Option[A], until : Option[A]) : SortedSet[A] = {
-      if (this.from != None && from == None) return rangeImpl(this.from, until);
-      if (this.until != None && until == None) return rangeImpl(from, this.until);
-      if (from != None && compare(this.from.get, from.get) > 0) return rangeImpl(this.from, until);
-      if (until != None && compare(this.until.get, until.get) < 0) return rangeImpl(from, this.until);
-      SortedSet.this.rangeImpl(from, until);
-    }
-    /*
-    class RangeIterator(underlying : MutableIterator[A]#Buffered) extends MutableIterator[A] {
-      if (from != None)
-        underlying.seekNext(a => compare(from.get, a) <= 0);
-
-      private def okNext(a : A) =
-        if (until == None) true;
-        else compare(a, until.get) < 0;
-
-      def hasNext = underlying.hasNext && okNext(underlying.peekNext);
-      def next = underlying.seekNext(okNext) match {
-      case Some(result) => underlying.next; result;
-      case None => throw new NoSuchElementException;
-      }
-      def remove = underlying.remove;
-    }*/
-  }
-}
diff --git a/src/library/scala/collection/jcl/SortedSetWrapper.scala b/src/library/scala/collection/jcl/SortedSetWrapper.scala
deleted file mode 100644
index c44a2274a0..0000000000
--- a/src/library/scala/collection/jcl/SortedSetWrapper.scala
+++ /dev/null
@@ -1,39 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-/** <p>
- *    A wrapper around a Java sorted set.
- *  </p>
- *  <p>
- *    The comparator of the sorted set matches the comparator of this set.
- *  </p>
- *
- *  @author Sean McDirmid
- */
-trait SortedSetWrapper[A] extends SortedSet[A] with SetWrapper[A] {
-  def underlying : java.util.SortedSet[A];
-  /** delegates to the comparator of the underlying Java sorted set */
-  override def compare(a0 : A, a1 : A) = underlying.comparator.compare(a0, a1);
-  override def firstKey = underlying.first.asInstanceOf[A];
-  override def lastKey  = underlying.last .asInstanceOf[A];
-  override def rangeImpl(from : Option[A], until : Option[A]) : SortedSet[A] = new Range(from,until);
-  protected class Range(from : Option[A], until : Option[A]) extends super.Range(from, until) with SortedSetWrapper[A] {
-    val underlying = Tuple2(from,until) match {
-    case Tuple2(None,Some(until)) => SortedSetWrapper.this.underlying.headSet(until);
-    case Tuple2(Some(from),None)  => SortedSetWrapper.this.underlying.tailSet(from);
-    case Tuple2(Some(from),Some(until)) => SortedSetWrapper.this.underlying.subSet(from,until);
-    case _ => throw new IllegalArgumentException;
-    }
-    override def elements : MutableIterator[A] = super[SortedSetWrapper].elements;
-  }
-  override def toString = super.toString;
-}
diff --git a/src/library/scala/collection/jcl/Tests.scala b/src/library/scala/collection/jcl/Tests.scala
deleted file mode 100644
index 0d69de623f..0000000000
--- a/src/library/scala/collection/jcl/Tests.scala
+++ /dev/null
@@ -1,79 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl;
-
-import java.lang.Integer;
-
-private[jcl] object Tests {
-
-  def main(args : Array[String]) : Unit = {
-    hashSet;
-    treeSet;
-    treeMap;
-  }
-
-  def treeSet : Unit = {
-    val set = new TreeSet[String];
-    set + "aaa" + "bbb" + "ccc" + "ddd" + "eee" + "fff";
-    Console.println(set);
-    val rset : SortedSet[String] = set.range("b", "e");
-    Console.println(rset);
-    rset + "bad";
-    Console.println(rset);
-    Console.println(set);
-    val fset : SortedSet[String] = rset.projection.filter(_.endsWith("d"));
-    Console.println(fset);
-    fset += "cd";
-    Console.println(set);
-    //set.projection.map(_.length).retain(x => x == 3);
-    Console.println(set);
-    Console.println(rset);
-    Console.println(fset);
-  }
-
-  def treeMap : Unit = {
-    val map = new TreeMap[String,Integer];
-    map + ("bb" -> 3) + ("cc" -> 4) + ("aa" -> 2) + ("dd" -> 5);
-    //Console.println(map);
-    val rmap : SortedMap[String,Integer] = map.range("b", "d");
-    rmap + ("bad" -> 10);
-    Console.println(rmap);
-    //Console.println(map);
-    val fmap : SortedMap[String,Integer] = rmap.projection.filterKeys(k => k.length == 2);
-    Console.println(fmap);
-  }
-
-  def hashSet = {
-    val set = new HashSet[String];
-    set + "hello" + "world" + "you" + "to";
-    Console.println(set);
-    val fset = set.projection.filter(s => s.length <= 3);
-    Console.println(fset);
-    fset += "xxx";
-    Console.println(set);
-    try {
-      fset += "xxxx";
-      throw new Error;
-    } catch {
-      case e : IllegalArgumentException =>
-      case _ => throw new Error;
-    }
-    //val mset : MutableIterable[Int] = set // set.projection.map(s => s.length);
-    //Console.println(mset);
-    //mset.retain(n => n < 5);
-    Console.println(set);
-    val set1 = new HashSet[String] + "1" + "2" + "3";
-    set ++ (set1);
-    Console.println(set);
-    set.transform(s => "x_" + s);
-    Console.println(set);
-  }
-}
diff --git a/src/library/scala/collection/jcl/TreeMap.scala b/src/library/scala/collection/jcl/TreeMap.scala
deleted file mode 100644
index 1cbacabc8d..0000000000
--- a/src/library/scala/collection/jcl/TreeMap.scala
+++ /dev/null
@@ -1,24 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** A sorted map that is backed by a Java tree map.
- *
- * @author Sean McDirmid
- */
-class TreeMap[K <% Ordered[K], E] extends SortedMapWrapper[K, E] { tm =>
-  val underlying = (new java.util.TreeMap[K, E](new Comparator[K]))
-  override def clone: TreeMap[K, E] =
-    new TreeMap[K, E] {
-      override val underlying =
-        tm.underlying.clone().asInstanceOf[java.util.TreeMap[K, E]]
-    }
-}
diff --git a/src/library/scala/collection/jcl/TreeSet.scala b/src/library/scala/collection/jcl/TreeSet.scala
deleted file mode 100644
index 9ea94dcdfd..0000000000
--- a/src/library/scala/collection/jcl/TreeSet.scala
+++ /dev/null
@@ -1,26 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** Creates a sorted set that is backed by an underlying Java tree set.
- *  Elements of the sorted set are ordered with respect to the ordered
- *  view bound of <code>A</code>.
- *
- *  @author Sean McDirmid
- */
-class TreeSet[A <% Ordered[A]] extends SortedSetWrapper[A] { ts =>
-  val underlying = new java.util.TreeSet[A](new Comparator[A])
-  override def clone: TreeSet[A] =
-    new TreeSet[A] {
-      override val underlying =
-        ts.underlying.clone().asInstanceOf[java.util.TreeSet[A]]
-    }
-}
diff --git a/src/library/scala/collection/jcl/WeakHashMap.scala b/src/library/scala/collection/jcl/WeakHashMap.scala
deleted file mode 100644
index 77ec0ab44d..0000000000
--- a/src/library/scala/collection/jcl/WeakHashMap.scala
+++ /dev/null
@@ -1,31 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-package scala.collection.jcl
-
-/** <p>
- *    A map that is backed by a Java weak hash map, whose keys are maintained
- *    as weak references.
- *  </p>
- *  <p>
- *    Because keys are weak references, the garbage collector can collect
- *    them if they are not referred to elsewhere.
- *  </p>
- *  <p>
- *    Useful for implementing caches.
- *  </p>
- *
- *  @author Sean McDirmid
- */
-class WeakHashMap[K, E](override val underlying: java.util.WeakHashMap[K, E]) extends MapWrapper[K, E] {
-  def this() = this(new java.util.WeakHashMap[K, E])
-  override def clone: WeakHashMap[K, E] =
-    throw new CloneNotSupportedException("The underlying map doesn't implement the Cloneable interface")
-}
diff --git a/src/library/scala/collection/mutable/ArrayBuffer.scala b/src/library/scala/collection/mutable/ArrayBuffer.scala
index a9aa2db978..82864cc7ee 100644
--- a/src/library/scala/collection/mutable/ArrayBuffer.scala
+++ b/src/library/scala/collection/mutable/ArrayBuffer.scala
@@ -11,8 +11,7 @@
 
 package scala.collection.mutable
 
-
-import Predef._
+import generic._
 
 /** An implementation of the <code>Buffer</code> class using an array to
  *  represent the assembled sequence internally. Append, update and random
@@ -20,10 +19,32 @@ import Predef._
  *  linear in the buffer size.
  *
  *  @author  Matthias Zenger
- *  @version 1.0, 15/03/2004
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
 @serializable
-class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with ResizableArray[A] {
+class ArrayBuffer[A](override protected val initialSize: Int)
+  extends Buffer[A]
+     with BufferTemplate[A, ArrayBuffer[A]]
+     with VectorTemplate[A, ArrayBuffer[A]]
+     with Builder[A, ArrayBuffer[A], Any]
+     with ResizableArray[A] {
+
+  import collection.Traversible
+
+  def this() = this(16)
+
+  def clear() { reduceToSize(0) }
+
+  override def sizeHint(len: Int) {
+    val newarray = new Array[AnyRef](len min 1)
+    Array.copy(array, 0, newarray, 0, size0)
+    array = newarray
+  }
+
+  override protected[this] def newBuilder = ArrayBuffer.newBuilder
+  override def traversibleBuilder[B]: Builder[B, ArrayBuffer[B], Any] = ArrayBuffer.newBuilder[B]
+
   /** Appends a single element to this buffer and returns
    *  the identity of the buffer. It takes constant time.
    *
@@ -39,28 +60,17 @@ class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with Resi
    *  via its <code>elements</code> method. The identity of the
    *  buffer is returned.
    *
-   *  @param iter  the iterable object.
+   *  @param iter  the iterfable object.
    *  @return      the updated buffer.
    */
-  override def ++=(iter: Iterable[A]) { iter copyToBuffer this }
-
-  override def ++[B >: A](that: Iterable[B]) : ArrayBuffer[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf
-  }
-
-  /** Appends a number of elements in an array
-   *
-   *  @param src    the array
-   *  @param start  the first element to append
-   *  @param len    the number of elements to append
-   */
-  override def ++=(src: Array[A], start: Int, len: Int) {
-    ensureSize(size0 + len)
-    Array.copy(src, start, array, size0, len)
-    size0 += len
+  override def ++=(iter: Traversible[A]) = iter match {
+    case v: Vector[_] =>
+      val n = v.length
+      ensureSize(size0 + n)
+      v.copyToArray(array.asInstanceOf[scala.Array[Any]], size0, n)
+      size0 += n
+    case _ =>
+      super.++=(iter)
   }
 
   /** Prepends a single element to this buffer and return
@@ -70,7 +80,7 @@ class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with Resi
    *  @param elem  the element to append.
    *  @return      the updated buffer.
    */
-  def +:(elem: A): Buffer[A] = {
+  def +:(elem: A): this.type = {
     ensureSize(size0 + 1)
     copy(0, 1, size0)
     array(0) = elem.asInstanceOf[AnyRef]
@@ -78,19 +88,6 @@ class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with Resi
     this
   }
 
-  /** Returns the i-th element of this ArrayBuffer. It takes constant time.
-   *
-   *  @param i  the specified index.
-   *  @return   the i-th element.
-   *  @throws Predef.IndexOutOfBoundException if <code>i</code> is out of bounds.
-   */
-  override def apply(i: Int) = {
-    if ((i < 0) || (i >= size0))
-      throw new IndexOutOfBoundsException(i.toString())
-    else
-      array(i).asInstanceOf[A]
-  }
-
   /** Prepends a number of elements provided by an iterable object
    *  via its <code>elements</code> method. The identity of the
    *  buffer is returned.
@@ -98,7 +95,7 @@ class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with Resi
    *  @param iter  the iterable object.
    *  @return      the updated buffer.
    */
-  override def ++:(iter: Iterable[A]): Buffer[A] = { insertAll(0, iter); this }
+  override def ++:(iter: Traversible[A]): this.type = { insertAll(0, iter); this }
 
   /** Inserts new elements at the index <code>n</code>. Opposed to method
    *  <code>update</code>, this method will not replace an element with a
@@ -108,81 +105,60 @@ class ArrayBuffer[A] extends RandomAccessSeq.Mutable[A] with Buffer[A] with Resi
    *  @param iter  the iterable object providing all elements to insert.
    *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
    */
-  def insertAll(n: Int, iter: Iterable[A]) {
+  def insertAll(n: Int, seq: Traversible[A]) {
     if ((n < 0) || (n > size0))
-      throw new IndexOutOfBoundsException("cannot insert element at " + n);
-    val xs = iter.elements.toList
+      throw new IndexOutOfBoundsException(n.toString)
+    val xs = seq.toList
     val len = xs.length
     ensureSize(size0 + len)
     copy(n, n + len, size0 - n)
-    xs.copyToArray(array.asInstanceOf[Array[Any]], n)
+    xs.copyToArray(array.asInstanceOf[scala.Array[Any]], n)
     size0 += len
   }
 
-  /** Replace element at index <code>n</code> with the new element
-   *  <code>newelem</code>. It takes constant time.
-   *
-   *  @param n       the index of the element to replace.
-   *  @param newelem the new element.
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  def update(n: Int, newelem: A) {
-    if ((n < 0) || (n >= size0))
-      throw new IndexOutOfBoundsException("cannot update element at " + n)
-    else {
-      val res = array(n).asInstanceOf[A]
-      array(n) = newelem.asInstanceOf[AnyRef]
-      res
-    }
-  }
-
   /** Removes the element on a given index position. It takes time linear in
    *  the buffer size.
    *
-   *  @param n  the index which refers to the element to delete.
+   *  @param n  the index which refers to the first element to delete.
+   *  @param count   the number of elemenets to delete
    *  @return   the updated array buffer.
    *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
    */
-  def remove(n: Int): A = {
+  override def remove(n: Int, count: Int) {
     if ((n < 0) || (n >= size0))
-      throw new IndexOutOfBoundsException("cannot remove element at " + n);
-    val res = array(n).asInstanceOf[A]
-    copy(n + 1, n, size0 - n - 1)
-    size0 -= 1
-    res
+      throw new IndexOutOfBoundsException(n.toString)
+    copy(n + count, n, size0 - (n + count))
+    size0 -= count
   }
 
-  /** Clears the buffer contents.
+  /** Removes the element on a given index position
+   *
+   *  @param n  the index which refers to the element to delete.
+   *  @return  The element that was formerly at position `n`
    */
-  def clear() {
-    size0 = 0
+  def remove(n: Int): A = {
+    val result = apply(n)
+    remove(n, 1)
+    result
   }
 
   /** Return a clone of this buffer.
    *
    *  @return an <code>ArrayBuffer</code> with the same elements.
    */
-  override def clone(): Buffer[A] = {
-    val res = new ArrayBuffer[A]
-    res ++= this
-    res
-  }
+  override def clone(): ArrayBuffer[A] = new ArrayBuffer[A] ++ this
 
-  /** Checks if two buffers are structurally identical.
-   *
-   *  @return true, iff both buffers contain the same sequence of elements.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: ArrayBuffer[_] =>
-      this.length == that.length &&
-    elements.zip(that.elements).forall {
-      case (thiselem, thatelem) => thiselem == thatelem
-    }
-    case _ =>
-      false
-  }
+  def result: ArrayBuffer[A] = this
 
   /** Defines the prefix of the string representation.
    */
-  override protected def stringPrefix: String = "ArrayBuffer"
+  override def stringPrefix: String = "ArrayBuffer"
 }
+
+/* Factory object for `ArrayBuffer` class */
+object ArrayBuffer extends SequenceFactory[ArrayBuffer] {
+  type Coll = ArrayBuffer[_]
+  implicit def builderFactory[A]: BuilderFactory[A, ArrayBuffer[A], Coll] = new BuilderFactory[A, ArrayBuffer[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, ArrayBuffer[A], Any] = new ArrayBuffer[A]
+}
+
diff --git a/src/library/scala/collection/mutable/ArrayStack.scala b/src/library/scala/collection/mutable/ArrayStack.scala
index f4abec337b..984f8a4c0a 100644
--- a/src/library/scala/collection/mutable/ArrayStack.scala
+++ b/src/library/scala/collection/mutable/ArrayStack.scala
@@ -8,7 +8,7 @@
 
 // $Id$
 
-
+// !!! todo: integrate in collections framework
 package scala.collection.mutable;
 
 private object Utils{
@@ -32,7 +32,7 @@ private object Utils{
  * @author David MacIver
  */
 class ArrayStack[T] private(private var table : Array[AnyRef],
-                            private var index : Int) extends Collection[T]{
+                            private var index : Int) extends Iterable[T]{
   def this() = this(new Array[AnyRef](1), 0);
 
   /**
@@ -59,13 +59,19 @@ class ArrayStack[T] private(private var table : Array[AnyRef],
 
   /**
    * View the top element of the stack.
+   * @deprecated use top instead
+   */
+  def peek = top
+
+  /**
+   * View the top element of the stack.
    */
-  def peek = table(index - 1).asInstanceOf[T]
+  def top = table(index - 1).asInstanceOf[T]
 
   /**
    * Duplicate the top element of the stack.
    */
-  def dup = push(peek);
+  def dup = push(top);
 
   /**
    * Empties the stack.
@@ -121,7 +127,7 @@ class ArrayStack[T] private(private var table : Array[AnyRef],
    */
   def reduceWith(f : (T, T) => T) = while(size > 1) combine(f)
 
-  def size = index;
+  override def size = index;
 
   /**
    * Evaluates the expression, preserving the contents of the stack so that
diff --git a/src/library/scala/collection/mutable/BitSet.scala b/src/library/scala/collection/mutable/BitSet.scala
index bfc02a5767..5ec33a059c 100644
--- a/src/library/scala/collection/mutable/BitSet.scala
+++ b/src/library/scala/collection/mutable/BitSet.scala
@@ -1,100 +1,50 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
 package scala.collection.mutable
 
+import generic._
 
-/**
- * The class <code>BitSet</code> implements mutable, resizable Bit sets
- *
- * @author  Burak Emir, Nikolay Mihaylov
- * @version 1.1
- *
- * @param initSize: initial size in bits
- */
+/** A class for mutable bitsets */
+class BitSet(initSize: Int) extends Set[Int] with collection.BitSet with BitSetTemplate[BitSet] {
 
-@serializable
-class BitSet(initSize: Int) extends collection.BitSet with Set[Int] {
+  override def empty = BitSet.empty
 
-  import compat.Platform.{arraycopy, arrayclear}
-
-  /** default constructor, initial size of 512 bits. */
   def this() = this(0)
 
-  /** Ensures that this bitset can store at least <code>n</code> bits.
-   *
-   *  @param n ...
-   */
-  def ensureCapacity(n: Int): Unit =
-    if (capacity < n) {
-      if (nbits(arr.length) < n) {
-        val newn = memsize(n)
-        var newsize = if (arr.length == 0) newn else arr.length * 2
-        while (newn > newsize)
-          newsize = newsize * 2;
-        val newarr = new Array[Int](newsize)
-        arraycopy(arr, 0, newarr, 0, arr.length)
-        arr = newarr
-      }
-      capacity = n
-    }
-
-  /**
-   * Sets <code>i-th</code> bit to true.
-   * No restriction on <code>i</code>
-   */
-  def +=(i: Int): Unit = {
-    ensureCapacity(i+1)
-    val oldInt = arr(offset(i))
-    val newInt = oldInt | mask(i)
-    if (oldInt != newInt) {
-      arr(offset(i)) = newInt
-      size = size + 1
+  protected var elems: Array[Long] = new Array[Long]((initSize + 63) >> 6 max 1)
+
+  protected def nwords = elems.length
+  protected def word(idx: Int): Long =
+    if (idx < nwords) elems(idx) else 0L
+  protected def updateWord(idx: Int, w: Long): BitSet = {
+    if (idx >= nwords) {
+      var newlen = nwords
+      while (idx >= newlen) newlen = newlen * 2
+      val elems1 = new Array[Long](newlen)
+      Array.copy(elems, 0, elems1, 0, nwords)
+      elems = elems1
     }
+    elems(idx) = w
+    this
   }
 
-  /** Clears the <code>i</code>-th bit.
-   *
-   *  @param i the <code>i</code>-th element of the bit set.
-   */
-  def -=(i: Int): Unit = {
-    if (i >= capacity) return;
-    val oldInt = arr(offset(i))
-    val newInt = oldInt & ~mask(i)
-    if (oldInt != newInt) {
-      arr(offset(i)) = newInt
-      size = size - 1
-    }
-  }
-
-  /** Clears all bits of the set.
-   */
-  override def clear(): Unit = {
-    arrayclear(arr)
-    size = 0
+  protected def fromArray(words: Array[Long]): BitSet = {
+    val s = new BitSet; s.elems = words; s
   }
 
-  def toImmutable: collection.immutable.BitSet =
-    new immutable.BitSet(size, capacity, arr, true)
+  override def += (elem: Int) { super.+(elem) }
 
-  override def clone(): BitSet = new BitSet(capacity) {
-    arraycopy(BitSet.this.arr, 0, arr, 0, arr.length)
-    size = BitSet.this.size
-    capacity = BitSet.this.capacity
-  }
+  override def -= (elem: Int) { super.-(elem) }
 
-  var size: Int = 0
+  override def + (elem: Int): this.type = { +=(elem); this }
 
-  var capacity: Int = initSize
+  override def - (elem: Int): this.type = { -=(elem); this }
 
-  protected var arr: Array[Int] = new Array[Int](memsize(initSize))
+  def toImmutable = immutable.BitSet.fromArray(elems)
+}
 
+/** A factory object for mutable bitsets */
+object BitSet {
+  def empty: BitSet = new BitSet
+  def apply(bits: Int*): BitSet = {
+    var s = empty; for (b <- bits) s += b; s
+  }
 }
diff --git a/src/library/scala/collection/mutable/Buffer.scala b/src/library/scala/collection/mutable/Buffer.scala
index 9e56d841d0..5fed53ae04 100644
--- a/src/library/scala/collection/mutable/Buffer.scala
+++ b/src/library/scala/collection/mutable/Buffer.scala
@@ -11,276 +11,27 @@
 
 package scala.collection.mutable
 
-
-import Predef._
+import generic._
 
 /** Buffers are used to create sequences of elements incrementally by
  *  appending, prepending, or inserting new elements. It is also
  *  possible to access and modify elements in a random access fashion
  *  via the index of the element in the current sequence.
- *
- *  @author  Matthias Zenger
- *  @version 1.1, 02/03/2004
- */
+  *
+ *  @author Matthias Zenger
+ *  @author Martin Odersky
+ *  @version 2.8
+  */
 @cloneable
-trait Buffer[A] extends AnyRef
-      with Seq[A]
-      with Scriptable[Message[(Location, A)]]
-      with CloneableCollection
-{
-
-  /** Append a single element to this buffer.
-   *
-   *  @param elem  the element to append.
-   */
-  def +=(elem: A): Unit
-
-  /** Append a two or more elements to this buffer.
-   *
-   *  enable this for 2.8.0!
-   *
-   *  @param elem1 the first element to append.
-   *  @param elem2 the second element to append.
-   *  @param elems the remaining elements to append.
-  def +=(elem1: A, elem2: A, elems: A*): Unit = {
-    this += elem1
-    this += elem2
-    this ++= elems
-  }
-   */
-
-  /** Append a single element to this buffer and return
-   *  the identity of the buffer.
-   *
-   *  @param elem  the element to append.
-   */
-  def +(elem: A): Buffer[A] = { this += elem; this }
-
-  /** Append two or more elements to this buffer and return
-   *  the identity of the buffer.
-   *
-   *  enable this for 2.8.0!
-   *
-   *  @param elem1 the first element to append.
-   *  @param elem2 the second element to append.
-   *  @param elems the remaining elements to append.
-  def +(elem1: A, elem2: A, elems: A*): Buffer[A] =
-    this + elem1 + elem2 ++ elems
-   */
-
-  /** Prepend a single element to this buffer and return
-   *  the identity of the buffer.
-   *
-   *  @param elem  the element to append.
-   */
-  def +:(elem: A): Buffer[A]
-
-  /** Appends a number of elements provided by an iterator
-   *
-   *  @param iter  the iterator.
-   */
-  def ++=(iter: Iterator[A]) { iter foreach += }
-
-  /** Appends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method.
-   *
-   *  @param iter  the iterable object.
-   */
-  def ++=(iter: Iterable[A]) { ++=(iter.elements) }
-
-  /** Appends a number of elements in an array
-   *
-   *  @param src    the array
-   *  @param start  the first element to append
-   *  @param len    the number of elements to append
-   */
-  def ++=(src: Array[A], start: Int, len: Int) {
-    var i = start
-    val end = i + len
-    while (i < end) {
-      this += src(i)
-      i += 1
-    }
-  }
-  /** return a read only alias of this buffer
-   */
-  def readOnly : Seq[A]
-
-  /** Appends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter     the iterable object.
-   *  @return       the updated buffer.
-   */
-  def ++(iter: Iterable[A]): Buffer[A] = { this ++= iter; this }
-
-  override def ++[B >: A](that : Iterable[B]) : Seq[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf
-  }
-
-  /** Appends a number of elements provided by an iterator
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter   the iterator
-   *  @return       the updated buffer.
-   */
-  def ++(iter: Iterator[A]): Buffer[A] = { this ++= iter; this }
-
-  /** Prepends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter  the iterable object.
-   */
-  def ++:(iter: Iterable[A]): Buffer[A] = {
-    iter.elements.toList.reverse.foreach(e => e +: this)
-    this
-  }
-
-  /** Removes a single element from this buffer, at its first occurrence.
-   *  If the list does not contain that element, it is unchanged
-   *
-   *  @param x  the element to remove.
-   */
-  def -= (x: A) {
-    val i = indexOf(x)
-    if(i != -1) remove(i)
-  }
-
-  /** Appends a sequence of elements to this buffer.
-   *
-   *  @param elems  the elements to append.
-   */
-  def append(elems: A*) { this ++= elems }
-
-  /** Appends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method.
-   *
-   *  @param iter  the iterable object.
-   */
-  def appendAll(iter: Iterable[A]) { this ++= iter }
-
-  /** Prepend an element to this list.
-   *
-   *  @param elem  the element to prepend.
-   */
-  def prepend(elems: A*) { elems ++: this }
-
-  /** Prepends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter  the iterable object.
-   */
-  def prependAll(iter: Iterable[A]) { iter ++: this }
-
-  /** Inserts new elements at the index <code>n</code>. Opposed to method
-   *  <code>update</code>, this method will not replace an element with a
-   *  one. Instead, it will insert the new elements at index <code>n</code>.
-   *
-   *  @param n      the index where a new element will be inserted.
-   *  @param elems  the new elements to insert.
-   */
-  def insert(n: Int, elems: A*) { insertAll(n, elems) }
-
-  /** Inserts new elements at the index <code>n</code>. Opposed to method
-   *  <code>update</code>, this method will not replace an element with a
-   *  one. Instead, it will insert a new element at index <code>n</code>.
-   *
-   *  @param n     the index where a new element will be inserted.
-   *  @param iter    the iterable object providing all elements to insert.
-   */
-  def insertAll(n: Int, iter: Iterable[A]): Unit
-
-  /** Replace element at index <code>n</code> with the new element
-   *  <code>newelem</code>.
-   *
-   *  @param n       the index of the element to replace.
-   *  @param newelem the new element.
-   */
-  def update(n: Int, newelem: A): Unit
-
-  /** Removes the element on a given index position.
-   *
-   *  @param n  the index which refers to the element to delete.
-   */
-  def remove(n: Int): A
-
-  /** Removes the first <code>n</code> elements.
-   *
-   *  @param n  the number of elements to remove from the beginning
-   *            of this buffer.
-   */
-  def trimStart(n: Int) {
-    var i = n
-    while (i > 0) { remove(0); i -= 1 }
-  }
-
-  /** Removes the last <code>n</code> elements.
-   *
-   *  @param n  the number of elements to remove from the end
-   *            of this buffer.
-   */
-  def trimEnd(n: Int) {
-    var i = n
-    while (i > 0) { remove(length - 1); i -= 1 }
-  }
-
-  /** Clears the buffer contents.
-   */
-  def clear(): Unit
-
-  /** Send a message to this scriptable object.
-   *
-   *  @param cmd  the message to send.
-   */
-  def <<(cmd: Message[(Location, A)]) {
-    cmd match {
-      case Include((l, elem)) => l match {
-        case Start => prepend(elem)
-        case End => append(elem)
-        case Index(n) => insert(n, elem)
-        case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-      }
-      case Update((l, elem)) => l match {
-        case Start => update(0, elem)
-        case End => update(length - 1, elem)
-        case Index(n) => update(n, elem)
-        case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-      }
-      case Remove((l, _)) => l match {
-        case Start => remove(0)
-        case End => remove(length - 1)
-        case Index(n) => remove(n)
-        case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-      }
-      case Reset() => clear
-      case s: Script[_] => s.elements foreach <<
-      case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-    }
-  }
-
-  /** Return a clone of this buffer.
-   *
-   *  @return a buffer with the same elements.
-   */
-  override def clone(): Buffer[A] = super.clone().asInstanceOf[Buffer[A]]
-
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use buffers as keys in hash tables.
-   *
-   *  @return never.
-   */
-  override def hashCode(): Int =
-    throw new UnsupportedOperationException("unsuitable as hash key")
-
-  /** Defines the prefix of the string representation.
-   */
-  override protected def stringPrefix: String = "Buffer"
+trait Buffer[A] extends Sequence[A] with BufferTemplate[A, Buffer[A]] {
+  override protected[this] def newBuilder = Buffer.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Buffer[B], Any] = Buffer.newBuilder[B]
+}
 
+/* Factory object for `Buffer` trait */
+object Buffer extends SequenceFactory[Buffer] {
+  type Coll = Buffer[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Buffer[A], Coll] = new BuilderFactory[A, Buffer[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Buffer[A], Any] = new ArrayBuffer
 }
+
diff --git a/src/library/scala/collection/mutable/BufferProxy.scala b/src/library/scala/collection/mutable/BufferProxy.scala
index 92d26ab2b9..e6406e2bb2 100644
--- a/src/library/scala/collection/mutable/BufferProxy.scala
+++ b/src/library/scala/collection/mutable/BufferProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -154,3 +155,4 @@ trait BufferProxy[A] extends Buffer[A] with Proxy {
     def self = BufferProxy.this.self.clone()
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/CloneableCollection.scala b/src/library/scala/collection/mutable/CloneableCollection.scala
index c49fcf308c..8dea90eb2a 100644
--- a/src/library/scala/collection/mutable/CloneableCollection.scala
+++ b/src/library/scala/collection/mutable/CloneableCollection.scala
@@ -13,7 +13,8 @@ package scala.collection.mutable
 
 /** The J2ME version of the library defined this trait with a clone method
  * to substitute for the lack of Object.clone there
+ *  @deprecated use Cloneable instead
  */
-trait CloneableCollection {
+@deprecated trait CloneableCollection {
   override def clone(): AnyRef = super.clone()
 }
diff --git a/src/library/scala/collection/mutable/DefaultEntry.scala b/src/library/scala/collection/mutable/DefaultEntry.scala
index 5d0c64fc27..16a4448650 100644
--- a/src/library/scala/collection/mutable/DefaultEntry.scala
+++ b/src/library/scala/collection/mutable/DefaultEntry.scala
@@ -11,8 +11,6 @@
 
 package scala.collection.mutable
 
-import Predef._
-
 @serializable
 final class DefaultEntry[A, B](val key: A, var value: B)
       extends HashEntry[A, DefaultEntry[A, B]]
diff --git a/src/library/scala/collection/mutable/DefaultMapModel.scala b/src/library/scala/collection/mutable/DefaultMapModel.scala
index 803849b70b..de515ded7d 100644
--- a/src/library/scala/collection/mutable/DefaultMapModel.scala
+++ b/src/library/scala/collection/mutable/DefaultMapModel.scala
@@ -11,8 +11,6 @@
 
 package scala.collection.mutable
 
-import Predef._
-
 /** This class is used internally. It implements the mutable <code>Map</code>
  *  class in terms of three functions: <code>findEntry</code>,
  *  <code>addEntry</code>, and <code>entries</code>.
diff --git a/src/library/scala/collection/mutable/DoubleLinkedList.scala b/src/library/scala/collection/mutable/DoubleLinkedList.scala
index db2a6299b4..6b8174357a 100644
--- a/src/library/scala/collection/mutable/DoubleLinkedList.scala
+++ b/src/library/scala/collection/mutable/DoubleLinkedList.scala
@@ -1,7 +1,7 @@
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
 ** /____/\___/_/ |_/____/_/ | |                                         **
 **                          |/                                          **
 \*                                                                      */
@@ -11,42 +11,26 @@
 
 package scala.collection.mutable
 
+import generic._
 
-/** This extensible class may be used as a basis for implementing double
- *  linked lists. Type variable <code>A</code> refers to the element type
- *  of the list, type variable <code>This</code> is used to model self
- *  types of linked lists.
+/** This class implements single linked lists where both the head (<code>elem</code>)
+ *  and the tail (<code>next</code>) are mutable.
  *
- *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
+ *  @author Matthias Zenger
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-abstract class DoubleLinkedList[A, This >: Null <: DoubleLinkedList[A, This]]
-         extends SingleLinkedList[A, This]
-{ self: This =>
-
-  var prev: This
-
-  override def append(that: This): Unit =
-    if (that eq null)
-      ()
-    else if (next eq null) {
-      next = that
-      that.prev = this
-    } else
-      next.append(that)
-
-  override def insert(that: This): Unit = if (that ne null) {
-    that.append(next)
-    next = that
-    that.prev = this
-  }
-
-  def remove() {
-    if (next ne null)
-      next.prev = prev
-    if (prev ne null)
-      prev.next = next
-    prev = null
-    next = null
-  }
+@serializable
+class DoubleLinkedList[A]/*(_elem: A, _next: DoubleLinkedList[A])*/ extends LinearSequence[A] with DoubleLinkedListTemplate[A, DoubleLinkedList[A]] {
+  override protected[this] def newBuilder = DoubleLinkedList.newBuilder
+  override def traversibleBuilder[B]: Builder[B, DoubleLinkedList[B], Any] = DoubleLinkedList.newBuilder[B]
 }
+
+object DoubleLinkedList extends SequenceFactory[DoubleLinkedList] {
+  type Coll = DoubleLinkedList[_]
+  implicit def builderFactory[A]: BuilderFactory[A, DoubleLinkedList[A], Coll] = new BuilderFactory[A, DoubleLinkedList[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, DoubleLinkedList[A], Any] = null // !!!
+}
+
+
+
diff --git a/src/library/scala/collection/mutable/FlatHashTable.scala b/src/library/scala/collection/mutable/FlatHashTable.scala
index fa31d81d2c..c4ea42a3dd 100644
--- a/src/library/scala/collection/mutable/FlatHashTable.scala
+++ b/src/library/scala/collection/mutable/FlatHashTable.scala
@@ -113,7 +113,7 @@ trait FlatHashTable[A] {
   def elements = new Iterator[A] {
     private var i = 0
     def hasNext: Boolean = {
-      while (i < table.length && (null == table(i))) i += 1;
+      while (i < table.length && (null == table(i))) i += 1
       i < table.length
     }
     def next(): A =
diff --git a/src/library/scala/collection/jcl/HashSet.scala b/src/library/scala/collection/mutable/HashEntry.scala
index fb910fdd45..01cd59f8d8 100644..100755
--- a/src/library/scala/collection/jcl/HashSet.scala
+++ b/src/library/scala/collection/mutable/HashEntry.scala
@@ -1,21 +1,13 @@
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
 **  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
 ** /____/\___/_/ |_/____/_/ | |                                         **
 **                          |/                                          **
 \*                                                                      */
+package scala.collection.mutable
 
-// $Id$
-
-package scala.collection.jcl
-
-/** A hash set that is backed by a Java hash set.
- *
- *  @author Sean McDirmid
- */
-class HashSet[A](override val underlying: java.util.HashSet[A]) extends SetWrapper[A] {
-  def this() = this(new java.util.HashSet[A])
-  override def clone: HashSet[A] =
-    new HashSet[A](underlying.clone().asInstanceOf[java.util.HashSet[A]])
+trait HashEntry [A, E] {
+  val key: A
+  var next: E = _
 }
diff --git a/src/library/scala/collection/mutable/HashMap.scala b/src/library/scala/collection/mutable/HashMap.scala
index 2b3ce51cc1..654c6f7529 100644
--- a/src/library/scala/collection/mutable/HashMap.scala
+++ b/src/library/scala/collection/mutable/HashMap.scala
@@ -11,30 +11,30 @@
 
 package scala.collection.mutable
 
-import Predef._
+import generic._
 
-/** This class implements mutable maps using a hashtable.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-object HashMap {
-
-  /** The empty map of this type */
-  def empty[A, B] = new HashMap[A, B]
-
-  /** The canonical factory for this type
-   */
-  def apply[A, B](elems: (A, B)*) = empty[A, B] ++ elems
-}
 
 @serializable
-class HashMap[A, B] extends Map[A,B] with HashTable[A] with DefaultMapModel[A,B] {
+class HashMap[A, B] extends Map[A, B] with MutableMapTemplate[A, B, HashMap[A, B]] with HashTable[A] with DefaultMapModel[A, B] {
+
+  override def empty: HashMap[A, B] = HashMap.empty[A, B]
+  override def mapBuilder[A, B]: Builder[(A, B), HashMap[A, B], Any] = HashMap.newBuilder[A, B]
 
   def -= (key: A) { removeEntry(key) }
 
   override def clear() = super.clear()
 
-  override def clone(): Map[A, B] = new HashMap[A, B] ++ this
+  override def size: Int = super[HashTable].size
+}
+
+/** This class implements mutable maps using a hashtable.
+ *
+ *  @author  Matthias Zenger
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+object HashMap extends MutableMapFactory[HashMap] {
+  type Coll = HashMap[_, _]
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), HashMap[A, B], Coll] = new BuilderFactory[(A, B), HashMap[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
+  def empty[A, B]: HashMap[A, B] = new HashMap[A, B]
 }
diff --git a/src/library/scala/collection/mutable/HashSet.scala b/src/library/scala/collection/mutable/HashSet.scala
index 019d79ed09..14f2d00013 100644
--- a/src/library/scala/collection/mutable/HashSet.scala
+++ b/src/library/scala/collection/mutable/HashSet.scala
@@ -11,24 +11,21 @@
 
 package scala.collection.mutable
 
+import generic._
+
 /** This class implements mutable sets using a hashtable.
  *
  *  @author  Matthias Zenger
  *  @author  Martin Odersky
  *  @version 2.0, 31/12/2006
  */
-object HashSet {
+@serializable
+class HashSet[A] extends Set[A] with SetTemplate[A, HashSet[A]] with FlatHashTable[A] {
 
-  /** The empty map of this type */
-  def empty[A] = new HashSet[A]
+  override def empty = HashSet.empty
+  override def traversibleBuilder[B]: Builder[B, HashSet[B], Any] = HashSet.newBuilder[B]
 
-  /** The canonical factory for this type
-   */
-  def apply[A](elems: A*) = empty[A] ++ elems
-}
-
-@serializable
-class HashSet[A] extends Set[A] with FlatHashTable[A] {
+  override def size = super.size
 
   def contains(elem: A): Boolean = containsEntry(elem)
 
@@ -38,6 +35,23 @@ class HashSet[A] extends Set[A] with FlatHashTable[A] {
 
   override def clear() = super.clear()
 
-  override def clone(): Set[A] = new HashSet[A] ++ this
+  override def foreach(f: A => Unit) {
+    var i = 0
+    val len = table.length
+    while (i < len) {
+      val elem = table(i)
+      if (elem ne null) f(elem.asInstanceOf[A])
+      i += 1
+    }
+  }
+
+  override def clone(): HashSet[A] = new HashSet[A] ++ this
+}
+
+/** Factory object for `HashSet` class */
+object HashSet extends SetFactory[HashSet] {
+  type Coll = HashSet[_]
+  implicit def builderFactory[A]: BuilderFactory[A, HashSet[A], Coll] = new BuilderFactory[A, HashSet[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def empty[A]: HashSet[A] = new HashSet[A]
 }
 
diff --git a/src/library/scala/collection/mutable/HashTable.scala b/src/library/scala/collection/mutable/HashTable.scala
index a66d30cf44..1cd4698b01 100644
--- a/src/library/scala/collection/mutable/HashTable.scala
+++ b/src/library/scala/collection/mutable/HashTable.scala
@@ -163,10 +163,4 @@ trait HashTable[A] extends AnyRef {
   protected final def index(hcode: Int) = improve(hcode) & (table.length - 1)
 }
 
-trait HashEntry[A, E] {
-  val key: A
-  var next: E = _
-}
-
-
 
diff --git a/src/library/scala/collection/mutable/History.scala b/src/library/scala/collection/mutable/History.scala
index fe5d1beca2..e90f570c53 100644
--- a/src/library/scala/collection/mutable/History.scala
+++ b/src/library/scala/collection/mutable/History.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -46,3 +47,4 @@ class History[A, B] extends AnyRef with Subscriber[A, B] with Collection[(B, A)]
 
   def clear(): Unit = log.clear
 }
+*/
diff --git a/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala b/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala
index b62904da2d..0aa3dddcaa 100644
--- a/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala
+++ b/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala
@@ -1,4 +1,5 @@
-/*                     __                                               *\
+/* TODO: Reintegrate
+* /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
 **  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
@@ -63,3 +64,4 @@ extends Map[A, B]
 
   override def toString() = imap.toString()
 }
+*/
diff --git a/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala b/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
index fc1f63903f..894802cecf 100644
--- a/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
+++ b/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -47,3 +48,4 @@ class ImmutableSetAdaptor[A](protected var set: immutable.Set[A]) extends Set[A]
   override def clear(): Unit = { set = set.empty }
 
 }
+*/
diff --git a/src/library/scala/collection/mutable/Iterable.scala b/src/library/scala/collection/mutable/Iterable.scala
new file mode 100755
index 0000000000..52a42c5e09
--- /dev/null
+++ b/src/library/scala/collection/mutable/Iterable.scala
@@ -0,0 +1,29 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.mutable
+
+import generic._
+
+/** A subtrait of collection.Iterable which represents iterables
+ *  that can be mutated.
+ *
+ *  @autor   Martin Odersky
+ *  @version 2.8
+ */
+trait Iterable[A] extends Traversible[A] with collection.Iterable[A] with IterableTemplate[A, Iterable[A]] { self =>
+  override protected[this] def newBuilder = Iterable.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Iterable[B], Any] = Iterable.newBuilder[B]
+}
+
+/* A factory object for the trait `Iterable` */
+object Iterable extends TraversibleFactory[Iterable] {
+  type Coll = Iterable[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Iterable[A], Coll] = new BuilderFactory[A, Iterable[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Iterable[A], Any] = new ArrayBuffer
+}
+
diff --git a/src/library/scala/collection/mutable/JavaMapAdaptor.scala b/src/library/scala/collection/mutable/JavaMapAdaptor.scala
index dbf49c0f41..cb5d8b8931 100644
--- a/src/library/scala/collection/mutable/JavaMapAdaptor.scala
+++ b/src/library/scala/collection/mutable/JavaMapAdaptor.scala
@@ -21,7 +21,7 @@ package scala.collection.mutable
  */
 @deprecated class JavaMapAdaptor[A, B](jmap: java.util.Map[A, B]) extends Map[A, B] {
 
-  def size: Int = jmap.size()
+  override def size: Int = jmap.size()
 
   def get(key: A): Option[B] =
     if (jmap.containsKey(key)) Some(jmap.get(key).asInstanceOf[B]) else None
@@ -55,7 +55,7 @@ package scala.collection.mutable
     }
   }
 
-  def update(key: A, value: B): Unit = { val x = jmap.put(key, value); }
+  def update(key: A, value: B) { jmap.put(key, value) }
 
   def -= (key: A): Unit = { val x = jmap.remove(key); }
 
diff --git a/src/library/scala/collection/mutable/JavaSetAdaptor.scala b/src/library/scala/collection/mutable/JavaSetAdaptor.scala
index 8cc1e024ee..ae82f3fd0f 100644
--- a/src/library/scala/collection/mutable/JavaSetAdaptor.scala
+++ b/src/library/scala/collection/mutable/JavaSetAdaptor.scala
@@ -21,7 +21,7 @@ package scala.collection.mutable
  */
 @deprecated class JavaSetAdaptor[A](jset: java.util.Set[A]) extends Set[A] {
 
-  def size: Int = jset.size()
+  override def size: Int = jset.size()
 
   override def isEmpty: Boolean = jset.isEmpty()
 
@@ -45,3 +45,4 @@ package scala.collection.mutable
     res
   }
 }
+
diff --git a/src/library/scala/collection/mutable/LinearSequence.scala b/src/library/scala/collection/mutable/LinearSequence.scala
new file mode 100755
index 0000000000..d31da40386
--- /dev/null
+++ b/src/library/scala/collection/mutable/LinearSequence.scala
@@ -0,0 +1,17 @@
+package scala.collection.mutable
+
+import generic._
+
+/** A subtrait of collection.Sequence which represents sequences
+ *  that cannot be mutated.
+ */
+trait LinearSequence[A] extends Sequence[A] with collection.LinearSequence[A] with LinearSequenceTemplate[A, LinearSequence[A]] {
+  override protected[this] def newBuilder = LinearSequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, LinearSequence[B], Any] = LinearSequence.newBuilder[B]
+}
+
+object LinearSequence extends SequenceFactory[LinearSequence] {
+  type Coll = LinearSequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, LinearSequence[A], Coll] = new BuilderFactory[A, LinearSequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, LinearSequence[A], Any] = new MutableList[A]
+}
diff --git a/src/library/scala/collection/mutable/LinkedHashMap.scala b/src/library/scala/collection/mutable/LinkedHashMap.scala
index 302c3de9b4..bee3da8472 100644
--- a/src/library/scala/collection/mutable/LinkedHashMap.scala
+++ b/src/library/scala/collection/mutable/LinkedHashMap.scala
@@ -31,6 +31,10 @@ object LinkedHashMap {
 
 @serializable
 class LinkedHashMap[A, B] extends Map[A,B] with HashTable[A] with DefaultMapModel[A,B] {
+
+  override def empty = LinkedHashMap.empty
+  override def size = super[HashTable].size
+
   private var ordered = List[Entry]()
 
   def remove(key: A): Option[B] = removeEntry(key) match {
diff --git a/src/library/scala/collection/mutable/LinkedHashSet.scala b/src/library/scala/collection/mutable/LinkedHashSet.scala
index d4962f34cb..620cd31c15 100644
--- a/src/library/scala/collection/mutable/LinkedHashSet.scala
+++ b/src/library/scala/collection/mutable/LinkedHashSet.scala
@@ -10,18 +10,25 @@
 
 package scala.collection.mutable
 
+import generic._
 
+//!!! todo make inherit from HashSet.
 object LinkedHashSet {
   /** The empty map of this type */
   def empty[A] = new LinkedHashSet[A]
 
   /** The canonical factory for this type
    */
-  def apply[A](elems: A*) = empty[A] ++ elems
+  def apply[A](elems: A*) = empty[A] ++ collection.Iterable.fromOld(elems)
 }
 
 @serializable
-class LinkedHashSet[A] extends Set[A] with FlatHashTable[A] {
+class LinkedHashSet[A] extends Set[A] with SetTemplate[A, LinkedHashSet[A]] with FlatHashTable[A] {
+
+  override def empty = LinkedHashSet.empty
+
+  override def size = super.size
+
   private var ordered = List[A]()
 
   def contains(elem: A): Boolean = containsEntry(elem)
@@ -45,5 +52,6 @@ class LinkedHashSet[A] extends Set[A] with FlatHashTable[A] {
     super.clear()
   }
   override def clone(): Set[A] = new LinkedHashSet[A] ++ this
-  override def elements = ordered.reverse.elements
+  override def elements = Iterator.fromOld(ordered.reverse.elements)
 }
+
diff --git a/src/library/scala/collection/mutable/LinkedList.scala b/src/library/scala/collection/mutable/LinkedList.scala
index 9765ae1f1e..8c8ebd3b0f 100644
--- a/src/library/scala/collection/mutable/LinkedList.scala
+++ b/src/library/scala/collection/mutable/LinkedList.scala
@@ -11,36 +11,27 @@
 
 package scala.collection.mutable
 
+import generic._
+
 /** This class implements single linked lists where both the head (<code>elem</code>)
  *  and the tail (<code>next</code>) are mutable.
  *
- *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
+ *  @author Matthias Zenger
+ *  @author Martin Odersky
+ *  @version 2.8
  */
 @serializable
-class LinkedList[A](var elem: A, var next: LinkedList[A])
-  extends SingleLinkedList[A, LinkedList[A]]
-{
-
-  /** Compares two lists structurally; i.e. checks if all elements
-   *  contained in this list are also contained in the other list,
-   *  and vice versa.
-   *
-   *  @param that the other list
-   *  @return     <code>true</code> iff both lists contain exactly the
-   *              same mappings.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: LinkedList[_] => this.toList equals that.toList
-    case _ => false
-  }
-
-  /** A hash method compatible with <code>equals</code>
-   */
-  override def hashCode(): Int =
-    (0 /: elements) ((hash, kv) => hash + kv.hashCode)
-
-  override protected def stringPrefix: String = "LinkedList"
+class LinkedList[A](_elem: A, _next: LinkedList[A]) extends LinearSequence[A] with LinkedListTemplate[A, LinkedList[A]] {
+  elem = _elem
+  next = _next
+  override protected[this] def newBuilder = LinkedList.newBuilder
+  override def traversibleBuilder[B]: Builder[B, LinkedList[B], Any] = LinkedList.newBuilder[B]
+}
+
+object LinkedList extends SequenceFactory[LinkedList] {
+  type Coll = LinkedList[_]
+  implicit def builderFactory[A]: BuilderFactory[A, LinkedList[A], Coll] = new BuilderFactory[A, LinkedList[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, LinkedList[A], Any] = (new MutableList) mapResult ((l: MutableList[A]) => l.toLinkedList)
 }
 
 
diff --git a/src/library/scala/collection/mutable/ListBuffer.scala b/src/library/scala/collection/mutable/ListBuffer.scala
index 2fb8e39bdf..9374afc3db 100644
--- a/src/library/scala/collection/mutable/ListBuffer.scala
+++ b/src/library/scala/collection/mutable/ListBuffer.scala
@@ -11,144 +11,40 @@
 
 package scala.collection.mutable
 
-
-import Predef._
+import generic._
+// import immutable.{List, Nil, ::}
 
 /** A Buffer implementation back up by a list. It provides constant time
  *  prepend and append. Most other operations are linear.
  *
  *  @author  Matthias Zenger
- *  @version 1.0, 15/03/2004
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
 @serializable
-final class ListBuffer[A] extends Buffer[A] {
+final class ListBuffer[A]
+      extends Buffer[A]
+         with BufferTemplate[A, ListBuffer[A]]
+         with Builder[A, List[A], Any]
+         with SequenceForwarder[A]
+{
+  import collection.Traversible
+
   private var start: List[A] = Nil
   private var last0: ::[A] = _
   private var exported: Boolean = false
+  private var len = 0
 
-  /** Prepends a single element to this buffer. It takes constant
-   *  time.
-   *
-   *  @param x  the element to prepend.
-   *  @return   this buffer.
-   */
-  def +: (x: A): Buffer[A] = {
-    if (exported) copy()
-    val newElem = new scala.:: (x, start)
-    if (start.isEmpty) last0 = newElem
-    start = newElem
-    this
-  }
-
-
-
-  /** Appends a single element to this buffer. It takes constant
-   *  time.
-   *
-   *  @param x  the element to append.
-   */
-  override def += (x: A) {
-    if (exported) copy()
-    if (start.isEmpty) {
-      last0 = new scala.:: (x, Nil)
-      start = last0
-    } else {
-      val last1 = last0
-      last0 = new scala.:: (x, Nil)
-      last1.tl = last0
-    }
-  }
-
-  /** Removes a single element from the buffer and return
-   *  the identity of the buffer. Same as <code>this -= x; this</code>. It
-   *  takes linear time (except removing the first element, which is done
-   *  in constant time).
-   *
-   *  @param x  the element to remove.
-   *  @return   this buffer.
-   */
-  def - (x: A): Buffer[A] = { this -= x; this }
-
-  /** Remove a single element from this buffer. It takes linear time
-   *  (except removing the first element, which is done  in constant time).
-   *
-   *  @param x  the element to remove.
-   */
-  override def -= (x: A) {
-    if (exported) copy()
-    if (start.isEmpty) {}
-    else if (start.head == x) start = start.tail
-    else {
-      var cursor = start
-      while (!cursor.tail.isEmpty && cursor.tail.head != x) { cursor = cursor.tail }
-      if (!cursor.tail.isEmpty) {
-        val z = cursor.asInstanceOf[scala.::[A]]
-        if (z.tl == last0)
-          last0 = z
-        z.tl = cursor.tail.tail
-      }
-    }
-  }
-
-  /** Converts this buffer to a list. Takes constant time. The buffer is
-   *  copied lazily, the first time it is mutated.
-   */
-  override def toList: List[A] = {
-    exported = !start.isEmpty
-    start
-  }
-  /** expose the underlying list but do not mark it as exported */
-  override def readOnly : List[A] = start
+  protected def underlying: immutable.Sequence[A] = start
 
-  /** Prepends the elements of this buffer to a given list
-   *
-   *  @param xs   the list to which elements are prepended
-   */
-  def prependToList(xs: List[A]): List[A] =
-    if (start.isEmpty) xs
-    else { last0.tl = xs; toList }
+  override protected[this] def newBuilder = ListBuffer.newBuilder[A]
+  override def traversibleBuilder[B]: Builder[B, ListBuffer[B], Any] = ListBuffer.newBuilder[B]
 
-  /** Clears the buffer contents.
+  /** The current length of the buffer
    */
-  def clear() {
-    start = Nil
-    exported = false
-  }
+  override def length = len
 
-  /** Copy contents of this buffer */
-  private def copy() {
-    var cursor = start
-    val limit = last0.tail
-    clear
-    while (cursor ne limit) {
-      this += cursor.head
-      cursor = cursor.tail
-    }
-  }
-
-  /** Returns the length of this buffer. It takes linear time.
-   *
-   *  @return the length of this buffer.
-   */
-  def length: Int = start.length
-
-  // will be faster since this is a list
-  override def isEmpty = start.isEmpty
-
-  /** Returns the n-th element of this list. This method
-   *  yields an error if the element does not exist. Takes time
-   *  linear in the buffer size.
-   *
-   *  @param n  the position of the element to be returned.
-   *  @return   the n-th element of this buffer.
-   *  @throws Predef.IndexOutOfBoundsException
-   */
-  def apply(n: Int): A = try {
-    start(n)
-  } catch {
-    case ex: Exception =>
-      throw new IndexOutOfBoundsException(n.toString())
-  }
+  // Implementations of abstract methods in Buffer
 
   /** Replaces element at index <code>n</code> with the new element
    *  <code>newelem</code>. Takes time linear in the buffer size. (except the first
@@ -162,8 +58,11 @@ final class ListBuffer[A] extends Buffer[A] {
     try {
       if (exported) copy()
       if (n == 0) {
-        val newElem = new scala.:: (x, start.tail);
-        if (last0 eq start) last0 = newElem
+        val newElem = new :: (x, start.tail);
+        if (last0 eq start) {
+          last0 = newElem
+          len += 1
+        }
         start = newElem
       } else {
         var cursor = start
@@ -172,15 +71,58 @@ final class ListBuffer[A] extends Buffer[A] {
           cursor = cursor.tail
           i += 1
         }
-        val newElem = new scala.:: (x, cursor.tail.tail)
-        if (last0 eq cursor.tail) last0 = newElem
-        cursor.asInstanceOf[scala.::[A]].tl = newElem
+        val newElem = new :: (x, cursor.tail.tail)
+        if (last0 eq cursor.tail) {
+          last0 = newElem
+          len += 1
+        }
+        cursor.asInstanceOf[::[A]].tl = newElem
       }
     } catch {
       case ex: Exception => throw new IndexOutOfBoundsException(n.toString())
     }
   }
 
+  /** Appends a single element to this buffer. This operation takes constant time.
+   *
+   *  @param x  the element to append.
+   */
+  def += (x: A) {
+    if (exported) copy()
+    if (start.isEmpty) {
+      last0 = new :: (x, Nil)
+      start = last0
+    } else {
+      val last1 = last0
+      last0 = new :: (x, Nil)
+      last1.tl = last0
+    }
+    len += 1
+  }
+
+  /** Clears the buffer contents.
+   */
+  def clear() {
+    start = Nil
+    exported = false
+    len = 0
+  }
+
+  /** Prepends a single element to this buffer. This operation takes constant
+   *  time.
+   *
+   *  @param x  the element to prepend.
+   *  @return   this buffer.
+   */
+  def +: (x: A): this.type = {
+    if (exported) copy()
+    val newElem = new :: (x, start)
+    if (start.isEmpty) last0 = newElem
+    start = newElem
+    len += 1
+    this
+  }
+
   /** Inserts new elements at the index <code>n</code>. Opposed to method
    *  <code>update</code>, this method will not replace an element with a new
    *  one. Instead, it will insert a new element at index <code>n</code>.
@@ -189,13 +131,14 @@ final class ListBuffer[A] extends Buffer[A] {
    *  @param  iter  the iterable object providing all elements to insert.
    *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
    */
-  def insertAll(n: Int, iter: Iterable[A]) {
+  def insertAll(n: Int, seq: Traversible[A]) {
     try {
       if (exported) copy()
-      var elems = iter.elements.toList.reverse
+      var elems = seq.toList.reverse
+      len += elems.length
       if (n == 0) {
         while (!elems.isEmpty) {
-          val newElem = new scala.:: (elems.head, start)
+          val newElem = new :: (elems.head, start)
           if (start.isEmpty) last0 = newElem
           start = newElem
           elems = elems.tail
@@ -208,9 +151,9 @@ final class ListBuffer[A] extends Buffer[A] {
           i += 1
         }
         while (!elems.isEmpty) {
-          val newElem = new scala.:: (elems.head, cursor.tail)
+          val newElem = new :: (elems.head, cursor.tail)
           if (cursor.tail.isEmpty) last0 = newElem
-          cursor.asInstanceOf[scala.::[A]].tl = newElem
+          cursor.asInstanceOf[::[A]].tl = newElem
           elems = elems.tail
         }
       }
@@ -220,9 +163,66 @@ final class ListBuffer[A] extends Buffer[A] {
     }
   }
 
-  /** Removes the element on a given index position. Takes time linear in
-   *  the buffer size (except for the first element, which is removed in constant
-   *  time).
+  /** Removes a given number of elements on a given index position. May take time linear in
+   *  the buffer size.
+   *
+   *  @param n         the index which refers to the first element to remove.
+   *  @param count     the number of elements to remove.
+   */
+  override def remove(n: Int, count: Int) {
+    if (exported) copy()
+    val n1 = n max 0
+    val count1 = count min (len - n1)
+    var old = start.head;
+    if (n1 == 0) {
+      var c = count1
+      while (c > 0) {
+        start = start.tail
+        c -= 1
+      }
+    } else {
+      var cursor = start
+      var i = 1
+      while (i < n1) {
+        cursor = cursor.tail
+        i += 1
+      }
+      var c = count1
+      while (c > 0) {
+        if (last0 eq cursor.tail) last0 = cursor.asInstanceOf[::[A]]
+        cursor.asInstanceOf[::[A]].tl = cursor.tail.tail
+        c -= 1
+      }
+    }
+    len -= count1
+  }
+
+// Implementation of abstract method in Builder
+
+  def result: List[A] = toList
+
+  /** Converts this buffer to a list. Takes constant time. The buffer is
+   *  copied lazily, the first time it is mutated.
+   */
+  override def toList: List[A] = {
+    exported = !start.isEmpty
+    start
+  }
+
+// New methods in ListBuffer
+
+  /** Prepends the elements of this buffer to a given list
+   *
+   *  @param xs   the list to which elements are prepended
+   */
+  def prependToList(xs: List[A]): List[A] =
+    if (start.isEmpty) xs
+    else { last0.tl = xs; toList }
+
+// Overrides of methods in Buffer
+
+  /** Removes the element on a given index position. May take time linear in
+   *  the buffer size
    *
    *  @param  n  the index which refers to the element to delete.
    *  @return n  the element that was formerly at position <code>n</code>.
@@ -230,6 +230,7 @@ final class ListBuffer[A] extends Buffer[A] {
    *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
    */
   def remove(n: Int): A = try {
+    if (n < 0 || n >= len) throw new IndexOutOfBoundsException(n.toString())
     if (exported) copy()
     var old = start.head;
     if (n == 0) {
@@ -242,27 +243,38 @@ final class ListBuffer[A] extends Buffer[A] {
         i += 1
       }
       old = cursor.tail.head
-      if (last0 eq cursor.tail) last0 = cursor.asInstanceOf[scala.::[A]]
-      cursor.asInstanceOf[scala.::[A]].tl = cursor.tail.tail
+      if (last0 eq cursor.tail) last0 = cursor.asInstanceOf[::[A]]
+      cursor.asInstanceOf[::[A]].tl = cursor.tail.tail
     }
+    len -= 1
     old
-  } catch {
-    case ex: Exception =>
-      throw new IndexOutOfBoundsException(n.toString())
   }
 
-  /** <p>
-   *    Returns an iterator over all elements of this list.
-   *  </p>
-   *  <blockquote>
-   *    Note: the iterator can be affected by insertions, updates and
-   *    deletions that are performed afterwards on the buffer. To get
-   *    iterator an over the current buffer snapshot, use
-   *    <code>toList.elements</code>.
-   *  </blockquote>
+  /** Remove a single element from this buffer. May take time linear in the buffer size.
    *
-   *  @throws Predef.NoSuchElementException if buffer is empty
+   *  @param x  the element to remove.
    */
+  override def -= (elem: A) {
+    if (exported) copy()
+    if (start.isEmpty) {}
+    else if (start.head == elem) {
+      start = start.tail
+      len -= 1
+    } else {
+      var cursor = start
+      while (!cursor.tail.isEmpty && cursor.tail.head != elem) {
+        cursor = cursor.tail
+      }
+      if (!cursor.tail.isEmpty) {
+        val z = cursor.asInstanceOf[::[A]]
+        if (z.tl == last0)
+          last0 = z
+        z.tl = cursor.tail.tail
+        len -= 1
+      }
+    }
+  }
+
   override def elements = new Iterator[A] {
     var cursor: List[A] = null
     def hasNext: Boolean = !start.isEmpty && cursor != last0
@@ -275,31 +287,39 @@ final class ListBuffer[A] extends Buffer[A] {
       }
   }
 
+  /** expose the underlying list but do not mark it as exported */
+  def readOnly: List[A] = start
+
+  // Private methods
+
+  /** Copy contents of this buffer */
+  private def copy() {
+    var cursor = start
+    val limit = last0.tail
+    clear
+    while (cursor ne limit) {
+      this += cursor.head
+      cursor = cursor.tail
+    }
+  }
+
   /** Returns a clone of this buffer.
    *
    *  @return a <code>ListBuffer</code> with the same elements.
    */
-  override def clone(): Buffer[A] = (new ListBuffer[A]) ++ this
-
-  /** Checks if two buffers are structurally identical.
-   *
-   *  @return <code>true</code>, iff both buffers contain the same sequence
-   *          of elements.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: ListBuffer[_] =>
-      (this.length == that.length &&
-       elements.zip(that.elements).forall {
-         case (thiselem, thatelem) => thiselem == thatelem
-       })
-    case _ =>
-      false
-  }
+  override def clone(): ListBuffer[A] = (new ListBuffer[A]) ++ this
 
   /** Defines the prefix of the string representation.
    *
    *  @return the string representation of this buffer.
    */
-  override protected def stringPrefix: String = "ListBuffer"
+  override def stringPrefix: String = "ListBuffer"
+}
+
+/* Factory object for `ListBuffer` class */
+object ListBuffer extends SequenceFactory[ListBuffer] {
+  type Coll = ListBuffer[_]
+  implicit def builderFactory[A]: BuilderFactory[A, ListBuffer[A], Coll] = new BuilderFactory[A, ListBuffer[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, ListBuffer[A], Any] = new AddingBuilder(new ListBuffer[A])
 }
 
diff --git a/src/library/scala/collection/mutable/Location.scala b/src/library/scala/collection/mutable/Location.scala
index ff121b357e..cbe180f163 100644
--- a/src/library/scala/collection/mutable/Location.scala
+++ b/src/library/scala/collection/mutable/Location.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -27,3 +28,4 @@ case object Start extends Location
 case object End extends Location
 
 case class Index(n: Int) extends Location
+*/
diff --git a/src/library/scala/collection/mutable/Map.scala b/src/library/scala/collection/mutable/Map.scala
index 4c8fb7c1cd..cfa6ae5f1c 100644
--- a/src/library/scala/collection/mutable/Map.scala
+++ b/src/library/scala/collection/mutable/Map.scala
@@ -11,264 +11,35 @@
 
 package scala.collection.mutable
 
-import Predef._
-
-
-/** The canonical factory methods for <a href="Map.html">mutable maps</a>.
- *  These currently return <a href="HashMap.html">HashMap's</a>.
+import generic._
+
+trait Map[A, B]
+  extends Iterable[(A, B)]
+     with collection.Map[A, B]
+     with MutableMapTemplate[A, B, Map[A, B]]
+     with Unhashable {
+
+  override def empty: Map[A, B] = Map.empty
+  override def mapBuilder[A, B]: Builder[(A, B), Map[A, B], Any] = Map.newBuilder[A, B]
+
+  /** Return a read-only projection of this map.  !!! or just use an (immutable) MapProxy?
+  def readOnly : collection.Map[A, B] = new collection.Map[A, B] {
+    override def size = self.size
+    override def update(key: A, value: B) = self.update(key, value)
+    override def - (elem: A) = self - elem
+    override def elements = self.elements
+    override def foreach(f: ((A, B)) => Unit) = self.foreach(f)
+    override def empty[C] = self.empty[C]
+    def get(key: A) = self.get(key)
+  }
+  */
+}
+/* Factory object for `Map` class
+ * Currently this returns a HashMap.
  */
-object Map {
-
-  /** The empty map of this type; this is implemented as a hashtable */
+object Map extends MutableMapFactory[Map] {
+  type Coll = Map[_, _]
+  implicit def builderFactory[A, B]: BuilderFactory[(A, B), Map[A, B], Coll] = new BuilderFactory[(A, B), Map[A, B], Coll] { def apply(from: Coll) = from.mapBuilder[A, B] }
   def empty[A, B]: Map[A, B] = new HashMap[A, B]
-
-  /** The canonical factory for this type
-   */
-  def apply[A, B](elems: (A, B)*) = empty[A, B] ++ elems
 }
 
-/** This trait represents mutable maps. Concrete map implementations
- *  just have to provide functionality for the abstract methods in
- *  <code>scala.collection.Map</code> as well as for <code>update</code>,
- *  and <code>-=</code>.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-@cloneable
-trait Map[A, B] extends AnyRef
-      with collection.Map[A, B]
-      with Scriptable[Message[(A, B)]]
-      with CloneableCollection
-{
-  /** This method allows one to add a new mapping from <code>key</code>
-   *  to <code>value</code> to the map. If the map already contains a
-   *  mapping for <code>key</code>, it will be overridden by this
-   *  function.
-   *
-   * @param key    The key to update
-   * @param value  The new value
-   */
-  def update(key: A, value: B)
-
-  /** Add a key/value pair to this map.
-   *  @param    kv the key/value pair.
-   */
-  def += (kv: (A, B)) { update(kv._1, kv._2) }
-
-  /** Add two or more key/value pairs to this map.
-   *  @param    kv1 the first key/value pair.
-   *  @param    kv2 the second key/value pair.
-   *  @param    kvs the remaining key/value pairs.
-   */
-  def += (kv1: (A, B), kv2: (A, B), kvs: (A, B)*) {
-    this += kv1; this += kv2; this ++= kvs
-  }
-
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterable object containing all key/value pairs.
-   */
-  def ++= (kvs: Iterable[(A, B)]) { this ++= kvs.elements }
-
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterator containing all key/value pairs.
-   */
-  def ++= (kvs: Iterator[(A, B)]) { kvs foreach += }
-
-  /** Add a key/value pair to this map.
-   *  @param    kv the key/value pair.
-   *  @return   The map itself with the new binding added in place.
-   */
-  def + (kv: (A, B)): Map[A, B] = { this += kv; this }
-
-  /** Add two or more key/value pairs to this map.
-   *  @param    kv1 the first key/value pair.
-   *  @param    kv2 the second key/value pair.
-   *  @param    kvs the remaining key/value pairs.
-   *  @return   The map itself with the new bindings added in place.
-   */
-  def + (kv1: (A, B), kv2: (A, B), kvs: (A, B)*): Map[A, B] = {
-    this.+=(kv1, kv2, kvs: _*); this
-  }
-
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterable object containing all key/value pairs.
-   *  @return   The itself map with the new bindings added in place.
-   */
-  def ++ (kvs: Iterable[(A, B)]): Map[A, B] = { this ++= kvs; this }
-
-  /** Add a sequence of key/value pairs to this map.
-   *  @param    kvs the iterator containing all key/value pairs.
-   *  @return   The itself map with the new bindings added in place.
-   */
-  def ++ (kvs: Iterator[(A, B)]): Map[A, B] = { this ++= kvs; this }
-
-  /** Remove a key from this map, noop if key is not present.
-   *  @param    key the key to be removed
-   */
-  def -= (key: A)
-
-  /** Remove two or more keys from this map
-   *  @param    key1 the first key to be removed
-   *  @param    key2 the second key to be removed
-   *  @param    keys the remaining keys to be removed
-   */
-  def -= (key1: A, key2: A, keys: A*) { this -= key1; this -= key2; this --= keys }
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   */
-  def --= (keys: Iterable[A]) { this --= keys.elements }
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   */
-  def --= (keys: Iterator[A]) { keys foreach -= }
-
-  /** Remove a key from this map
-   *  @param    key the key to be removed
-   *  @return   The map itself with the binding for <code>key</code> removed if
-   *            it existed.
-   */
-  def - (key: A): Map[A, B] = { this -= key; this }
-
-  /** Remove <code>key</code> from this map and return the element
-   *  that the key was previously mapped to (if any).
-   */
-  def removeKey(key: A): Option[B] = {
-    val ret = get(key)
-    this -= key
-    ret
-  }
-
-  /** Map <code>key</code> to <code>elem</code> in this map and return the element
-   *  that the key was previously mapped to (if any).
-   */
-  def put(key: A, elem: B): Option[B] = {
-    val ret = get(key)
-    this(key) = elem
-    ret
-  }
-
-  /** Remove two or more keys from this map
-   *  @param    key1 the first key to be removed
-   *  @param    key2 the second key to be removed
-   *  @param    keys the remaining keys to be removed
-   *  @return   The map itself with all bindings for the given keys removed.
-   */
-  def - (key1: A, key2: A, keys: A*): Map[A, B] = { this.-=(key1, key2, keys: _*); this }
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   *  @return   The map itself with all bindings for <code>keys</code> removed.
-   */
-  def -- (keys: Iterable[A]): Map[A, B] = { this --= keys; this }
-
-  /** Remove a sequence of keys from this map
-   *  @param    keys the keys to be removed
-   *  @return   The map itself with all bindings for <code>keys</code> removed.
-   */
-  def -- (keys: Iterator[A]): Map[A, B] = { this --= keys; this }
-
-  /** Removes all mappings from the map. After this operation is
-   *  completed, the map is empty.
-   */
-  def clear() { keys foreach -= }
-
-  /** Check if this map maps <code>key</code> to a value.
-    * Return that value if it exists, otherwise put <code>default</code>
-    * as that key's value and return it.
-    */
-  def getOrElseUpdate(key: A, default: => B): B =
-    get(key) match {
-      case Some(v) => v
-      case None => val d = default; this(key) = d; d
-    }
-
-  /** This function transforms all the values of mappings contained
-   *  in this map with function <code>f</code>.
-   *
-   * @param f  The transformation to apply
-   */
-  def transform(f: (A, B) => B) {
-    elements foreach {
-      case (key, value) => update(key, f(key, value))
-    }
-  }
-
-  /** This method retains only those mappings for which the predicate
-   *  <code>p</code> returns <code>true</code>.
-   *
-   * @param p  The test predicate
-   * @deprecated cannot be type inferred because if retain in Iterable.
-   */
-  def retain(p: (A, B) => Boolean) {
-    toList foreach {
-      case (key, value) => if (!p(key, value)) -=(key)
-    }
-  }
-
-  /** Send a message to this scriptable object.
-   *
-   *  @param cmd  the message to send.
-   */
-  def <<(cmd: Message[(A, B)]): Unit = cmd match {
-    case Include((k, v)) => update(k, v)
-    case Update((k, v)) => update(k, v)
-    case Remove((k, _)) => this -= k
-    case Reset() => clear
-    case s: Script[_] => s.elements foreach <<
-    case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-  }
-
-  /** Return a clone of this map.
-   *
-   *  @return a map with the same elements.
-   */
-  override def clone(): Map[A, B] = super.clone().asInstanceOf[Map[A, B]]
-
-  /** Return a read-only projection of this map */
-  def readOnly: scala.collection.Map[A, B] = new scala.collection.Map[A, B] {
-    override def toString = "ro-" + Map.this.toString
-    override def size = Map.this.size
-    override def elements = Map.this.elements
-    override def get(key: A) = Map.this.get(key)
-  }
-
-  /** This method defines syntactic sugar for adding or modifying
-   *  mappings. It is typically used in the following way:
-   *  <pre>
-   *  map += key -> value
-   *  </pre>
-   *  @deprecated   use <code>+= Pair(key, value)</code>
-   */
-  @deprecated
-  def +=(key: A): MapTo = new MapTo(key)
-
-  /** <code>incl</code> can be used to add many mappings at the same time
-   *  to the map. The method assumes that a mapping is represented
-   *  by a <code>Pair</code> object who's first component denotes the
-   *  key, and who's second component refers to the value.
-   *
-   * @param mappings
-   * @deprecated   use <code>+=</code>
-   */
-  @deprecated
-  def incl(mappings: (A, B)*) { this ++= mappings.elements }
-
-  /** This method will remove all the mappings for the given sequence
-   *  of keys from the map.
-   *
-   * @param keys
-   * @deprecated    use <code>-=</code>
-   */
-  @deprecated
-  def excl(keys: A*) { this --= keys.elements }
-
-  @deprecated
-  class MapTo(key: A) {
-    def ->(value: B) { update(key, value) }
-  }
-
-}
diff --git a/src/library/scala/collection/mutable/MapProxy.scala b/src/library/scala/collection/mutable/MapProxy.scala
index 228b9daac3..a215702f19 100644
--- a/src/library/scala/collection/mutable/MapProxy.scala
+++ b/src/library/scala/collection/mutable/MapProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -55,3 +56,4 @@ trait MapProxy[A, B] extends Map[A, B] with collection.MapProxy[A, B] {
   @deprecated
   override def excl(keys: A*): Unit = self.excl(keys: _*)
 }
+*/
diff --git a/src/library/scala/collection/mutable/Message.scala b/src/library/scala/collection/mutable/Message.scala
index 1874a1d3b7..7b5ad7b2a0 100644
--- a/src/library/scala/collection/mutable/Message.scala
+++ b/src/library/scala/collection/mutable/Message.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -80,3 +81,4 @@ class Script[A] extends ArrayBuffer[Message[A]] with Message[A] {
   override def hashCode(): Int =
     throw new UnsupportedOperationException("scripts are not suitable as hash keys")
 }
+*/
diff --git a/src/library/scala/collection/mutable/MultiMap.scala b/src/library/scala/collection/mutable/MultiMap.scala
index 297568872e..7f7a8e9b07 100644
--- a/src/library/scala/collection/mutable/MultiMap.scala
+++ b/src/library/scala/collection/mutable/MultiMap.scala
@@ -17,23 +17,30 @@ package scala.collection.mutable
  *  <code>B</code> objects.
  *
  *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
 trait MultiMap[A, B] extends Map[A, Set[B]] {
   protected def makeSet: Set[B] = new HashSet[B]
 
-  def add(key: A, value: B): Unit = get(key) match {
-    case None =>
-      val set = makeSet
-      set += value
-      this(key) = set
-    case Some(set) =>
-      set += value
+  def addBinding(key: A, value: B): this.type = {
+    get(key) match {
+      case None =>
+        val set = makeSet
+        set += value
+        this(key) = set
+      case Some(set) =>
+        set += value
+    }
+    this
   }
 
-  def remove(key: A, value: B) = get(key) match {
-    case None =>
-    case Some(set) => set -= value
+  def removeBinding(key: A, value: B): this.type = {
+    get(key) match {
+      case None =>
+        case Some(set) => set -= value
+    }
+    this
   }
 
   def entryExists(key: A, p: B => Boolean): Boolean = get(key) match {
diff --git a/src/library/scala/collection/mutable/MutableList.scala b/src/library/scala/collection/mutable/MutableList.scala
index b4f6e59a33..c2ef583b98 100644
--- a/src/library/scala/collection/mutable/MutableList.scala
+++ b/src/library/scala/collection/mutable/MutableList.scala
@@ -11,36 +11,63 @@
 
 package scala.collection.mutable
 
+import generic._
+// import immutable.{List, Nil, ::}
 
 //import Predef.NoSuchElementException
 
 /** This class is used internally to represent mutable lists. It is the
- *  basis for the implementation of the classes <code>Buffer</code>,
+ *  basis for the implementation of the classes
  *  <code>Stack</code>, and <code>Queue</code>.
- *
+ *  !!! todo: convert to LinkedListBuffer?
  *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
-trait MutableList[A] extends Seq[A] with PartialFunction[Int, A] {
+class MutableList[A] extends LinearSequence[A] with LinearSequenceTemplate[A, MutableList[A]] with Builder[A, MutableList[A], Any] {
+
+  override protected[this] def newBuilder = new MutableList[A]
 
   protected var first0: LinkedList[A] = null
   protected var last0: LinkedList[A] = null
   protected var len: Int = 0
 
-  /** Returns the length of this list.
+  /** Is the list empty?
+   */
+  override def isEmpty = len == 0
+
+  /** Returns the first element in this list
    */
-  def length: Int = len
+  override def head: A = first0.head
 
-  /** Returns the <code>n</code>th element of this list. This method
-   *  yields an error if the element does not exist.
+  /** Returns the rest of this list
    */
-  def apply(n: Int): A = get(n) match {
-    case None => throw new NoSuchElementException("element not found")
-    case Some(value) => value
+  override def tail: MutableList[A] = {
+    val tl = new MutableList[A]
+    if (first0 ne last0) {
+      tl.first0 = first0.tail
+      tl.last0 = last0
+    }
+    tl.len = len - 1
+    tl
   }
 
+  /** Returns the length of this list.
+   */
+  override def length: Int = len
+
+  /** Returns the <code>n</code>th element of this list.
+   *  @throws IndexOutofBoundsException if index does not exist.
+   */
+  override def apply(n: Int): A = first0.apply(n)
+
+  /** Updates the <code>n</code>th element of this list to a new value.
+   *  @throws IndexOutofBoundsException if index does not exist.
+   */
+  def update(n: Int, x: A): Unit = first0.update(n, x)
+
   /** Returns the <code>n</code>th element of this list or <code>None</code>
-   *  if this element does not exist.
+   *  if index does not exist.
    */
   def get(n: Int): Option[A] = first0.get(n)
 
@@ -60,16 +87,13 @@ trait MutableList[A] extends Seq[A] with PartialFunction[Int, A] {
       len = len + 1
     }
 
-  protected def reset() {
-    first0 = null
-    last0 = null
-    len = 0
-  }
+  /** @deprecated use clear instead */
+  @deprecated def reset() { clear() }
 
   /** Returns an iterator over all elements of this list.
    */
   override def elements: Iterator[A] =
-    if (first0 eq null) Nil.elements else first0.elements
+    if (first0 eq null) Iterator.empty else first0.elements
 
   override def last = last0.elem
 
@@ -78,5 +102,22 @@ trait MutableList[A] extends Seq[A] with PartialFunction[Int, A] {
    */
   override def toList: List[A] = if (first0 eq null) Nil else first0.toList
 
-  override protected def stringPrefix: String = "MutableList"
+  /** Returns the current list of elements as a linked List
+   *  sequence of elements.
+   */
+  private[mutable] def toLinkedList: LinkedList[A] = first0
+
+  /** Appends a single element to this buffer. This takes constant time.
+   *
+   *  @param elem  the element to append.
+   */
+  def +=(elem: A) = appendElem(elem)
+
+  def clear() {
+    first0 = null
+    last0 = null
+    len = 0
+  }
+
+  def result = this
 }
diff --git a/src/library/scala/collection/mutable/ObservableBuffer.scala b/src/library/scala/collection/mutable/ObservableBuffer.scala
index cc39c4180c..40e8bf3641 100644
--- a/src/library/scala/collection/mutable/ObservableBuffer.scala
+++ b/src/library/scala/collection/mutable/ObservableBuffer.scala
@@ -1,4 +1,5 @@
-/*                     __                                               *\
+/* TODO: Reintegrate
+* /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
 **  __\ \/ /__/ __ |/ /__/ __ |                                         **
@@ -80,3 +81,4 @@ trait ObservableBuffer[A, This <: ObservableBuffer[A, This]]
     })
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/ObservableMap.scala b/src/library/scala/collection/mutable/ObservableMap.scala
index d86caf715d..1fd5c0dbca 100644
--- a/src/library/scala/collection/mutable/ObservableMap.scala
+++ b/src/library/scala/collection/mutable/ObservableMap.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -56,3 +57,4 @@ trait ObservableMap[A, B, This <: ObservableMap[A, B, This]]
     })
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/ObservableSet.scala b/src/library/scala/collection/mutable/ObservableSet.scala
index a9b30fb18c..6885c368fd 100644
--- a/src/library/scala/collection/mutable/ObservableSet.scala
+++ b/src/library/scala/collection/mutable/ObservableSet.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -43,3 +44,4 @@ trait ObservableSet[A, This <: ObservableSet[A, This]]
     })
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/OpenHashMap.scala b/src/library/scala/collection/mutable/OpenHashMap.scala
index b0b35960e2..f4ae7204aa 100644
--- a/src/library/scala/collection/mutable/OpenHashMap.scala
+++ b/src/library/scala/collection/mutable/OpenHashMap.scala
@@ -18,6 +18,8 @@ object OpenHashMap{
     dict;
   }
 
+  def empty[K, V] = new OpenHashMap[K, V];
+
   private[mutable] class Entry[Key, Value](val key : Key,
                                            val hash : Int,
                                            var value : Option[Value])
@@ -48,6 +50,8 @@ import OpenHashMap.Entry;
 class OpenHashMap[Key, Value](initialSize : Int) extends scala.collection.mutable.Map[Key, Value]{
   def this() = this(8);
 
+  override def empty = OpenHashMap.empty
+
   private[this] val actualInitialSize = OpenHashMap.nextPowerOfTwo(initialSize);
 
   private var mask = actualInitialSize - 1;;
@@ -58,7 +62,7 @@ class OpenHashMap[Key, Value](initialSize : Int) extends scala.collection.mutabl
   // Used for tracking inserts so that iterators can determine in concurrent modification has occurred.
   private[this] var modCount = 0;
 
-  def size = _size;
+  override def size = _size;
   private[this] def size_=(s : Int) = _size = s;
 
   protected def hashOf(key : Key) = {
@@ -200,12 +204,15 @@ class OpenHashMap[Key, Value](initialSize : Int) extends scala.collection.mutabl
   private[this] def foreachUndeletedEntry(f : Entry[Key, Value] => Unit){
     table.foreach(entry => if (entry != null && entry.value != None) f(entry));
   }
-
-  override def transform(f : (Key, Value) => Value) =
+  override def transform(f : (Key, Value) => Value) = {
     foreachUndeletedEntry(entry => entry.value = Some(f(entry.key, entry.value.get)));
+    this
+  }
 
-  override def retain(f : (Key, Value) => Boolean) =
+  override def retain(f : (Key, Value) => Boolean) = {
     foreachUndeletedEntry(entry => if (!f(entry.key, entry.value.get)) {entry.value = None; size -= 1; deleted += 1} );
+    this
+  }
 
   override def stringPrefix = "OpenHashMap"
 }
diff --git a/src/library/scala/collection/mutable/PriorityQueue.scala b/src/library/scala/collection/mutable/PriorityQueue.scala
index 1a3d1c2f56..70dfd56fff 100644
--- a/src/library/scala/collection/mutable/PriorityQueue.scala
+++ b/src/library/scala/collection/mutable/PriorityQueue.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -195,3 +196,4 @@ class PriorityQueue[A <% Ordered[A]] extends ResizableArray[A] with CloneableCol
     res
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/PriorityQueueProxy.scala b/src/library/scala/collection/mutable/PriorityQueueProxy.scala
index 47e4bbd9ad..7eab4df05e 100644
--- a/src/library/scala/collection/mutable/PriorityQueueProxy.scala
+++ b/src/library/scala/collection/mutable/PriorityQueueProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -98,3 +99,4 @@ abstract class PriorityQueueProxy[A <% Ordered[A]] extends PriorityQueue[A]
     def self = PriorityQueueProxy.this.self.clone()
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/Publisher.scala b/src/library/scala/collection/mutable/Publisher.scala
index 2a5e05b48e..77c9dff282 100644
--- a/src/library/scala/collection/mutable/Publisher.scala
+++ b/src/library/scala/collection/mutable/Publisher.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -46,3 +47,4 @@ trait Publisher[A, This <: Publisher[A, This]] { self: This =>
     filters.keys.foreach(sub =>
       if (filters.entryExists(sub, p => p(event))) sub.notify(this, event))
 }
+*/
diff --git a/src/library/scala/collection/mutable/Queue.scala b/src/library/scala/collection/mutable/Queue.scala
index 2bda38481c..f4fcab4abf 100644
--- a/src/library/scala/collection/mutable/Queue.scala
+++ b/src/library/scala/collection/mutable/Queue.scala
@@ -11,6 +11,7 @@
 
 package scala.collection.mutable
 
+import generic._
 
 //import Predef.{NoSuchElementException, UnsupportedOperationException}
 
@@ -18,44 +19,17 @@ package scala.collection.mutable
  *  insert and retrieve elements in a first-in-first-out (FIFO) manner.
  *
  *  @author  Matthias Zenger
- *  @version 1.1, 03/05/2004
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
 @serializable @cloneable
-class Queue[A] extends MutableList[A] with CloneableCollection {
-
-  /** Checks if the queue is empty.
-   *
-   *  @return true, iff there is no element in the queue.
-   */
-  override def isEmpty: Boolean = (first0 eq null)
-
-  /** Inserts a single element at the end of the queue.
-   *
-   *  @param  elem        the element to insert
-   */
-  def +=(elem: A): Unit = appendElem(elem)
-
-  /** Adds all elements provided by an <code>Iterable</code> object
-   *  at the end of the queue. The elements are prepended in the order they
-   *  are given out by the iterator.
-   *
-   *  @param  iter        an iterable object
-   */
-  def ++=(iter: Iterable[A]): Unit = this ++= iter.elements
-
-  /** Adds all elements provided by an iterator
-   *  at the end of the queue. The elements are prepended in the order they
-   *  are given out by the iterator.
-   *
-   *  @param  it        an iterator
-   */
-  def ++=(it: Iterator[A]): Unit = it foreach appendElem
+class Queue[A] extends MutableList[A] with Cloneable[Queue[A]] {
 
   /** Adds all elements to the queue.
    *
    *  @param  elems       the elements to add.
    */
-  def enqueue(elems: A*): Unit = (this ++= elems)
+  def enqueue(elems: A*): Unit = (this ++= collection.Iterable.fromOld(elems))
 
   /** Returns the first element in the queue, and removes this element
    *  from the queue.
@@ -106,9 +80,9 @@ class Queue[A] extends MutableList[A] with CloneableCollection {
    *  @return    a sequence of all elements in the queue for which
    *             p yields true.
    */
-  def dequeueAll(p: A => Boolean): Seq[A] = {
+  def dequeueAll(p: A => Boolean): Sequence[A] = {
     if (first0 eq null)
-      Seq.empty
+      Sequence.empty
     else {
       val res = new ArrayBuffer[A]
       while ((first0 ne null) && p(first0.elem)) {
@@ -156,47 +130,4 @@ class Queue[A] extends MutableList[A] with CloneableCollection {
    *  @return the first element.
    */
   def front: A = first0.elem
-
-  /** Removes all elements from the queue. After this operation is completed,
-   *  the queue will be empty.
-   */
-  def clear(): Unit = reset
-
-  /** Checks if two queues are structurally identical.
-   *
-   *  @return true, iff both queues contain the same sequence of elements.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: Queue[_] =>
-      (this.elements zip that.elements) forall {
-        case (thiselem, thatelem) => thiselem == thatelem
-      }
-    case _ =>
-      false
-  }
-
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use mutable queues as keys in hash tables.
-   *
-   *  @throws Predef.UnsupportedOperationException
-   *  @return never.
-   */
-  override def hashCode(): Int =
-    throw new UnsupportedOperationException("unsuitable as hash key")
-
-  /** Returns a textual representation of a queue as a string.
-   *
-   *  @return the string representation of this queue.
-   */
-  override def toString() = toList.mkString("Queue(", ", ", ")")
-
-  /** This method clones the queue.
-   *
-   *  @return  a queue with the same elements.
-   */
-  override def clone(): Queue[A] = {
-    val res = new Queue[A]
-    res ++= this
-    res
-  }
 }
diff --git a/src/library/scala/collection/mutable/QueueProxy.scala b/src/library/scala/collection/mutable/QueueProxy.scala
index 8480671b0b..cfe364108a 100644
--- a/src/library/scala/collection/mutable/QueueProxy.scala
+++ b/src/library/scala/collection/mutable/QueueProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -99,3 +100,4 @@ trait QueueProxy[A] extends Queue[A] with SeqProxy[A] {
     def self = QueueProxy.this.self.clone()
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/ResizableArray.scala b/src/library/scala/collection/mutable/ResizableArray.scala
index dc34ba87c0..1d260cc275 100644
--- a/src/library/scala/collection/mutable/ResizableArray.scala
+++ b/src/library/scala/collection/mutable/ResizableArray.scala
@@ -11,37 +11,43 @@
 
 package scala.collection.mutable
 
-import Predef._
+import generic._
 
 /** This class is used internally to implement data structures that
  *  are based on resizable arrays.
- *  //todo enrich with more efficient operations
  *
  *  @author  Matthias Zenger, Burak Emir
- *  @version 1.0, 03/05/2004
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-trait ResizableArray[A] extends RandomAccessSeq[A] {
+trait ResizableArray[A] extends Vector[A] with VectorTemplate[A, ResizableArray[A]] { self =>
+
+  import scala.Array // !!!
+  import collection.Iterable // !!!
+
+  override protected[this] def newBuilder = ResizableArray.newBuilder
+  override def traversibleBuilder[B]: Builder[B, ResizableArray[B], Any] = ResizableArray.newBuilder[B]
 
   protected def initialSize: Int = 16
-  protected var array: Array[AnyRef] = new Array[AnyRef](initialSize min 1)
-  private var size1: Int = 0
-  protected def size0: Int = size1
-  protected def size0_=(sz: Int) { size1 = sz }
+  protected var array: Array[AnyRef] = new Array[AnyRef](initialSize max 1)
+
+  protected var size0: Int = 0
 
   //##########################################################################
-  // implement/override methods of Seq[A]
+  // implement/override methods of Vector[A]
 
   /** Returns the length of this resizable array.
    */
   def length: Int = size0
 
-  def apply(i: Int) = array(i).asInstanceOf[A]
+  def apply(idx: Int) = {
+    if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
+    array(idx).asInstanceOf[A]
+  }
 
-  /** remove elements of this array at indices after <code>sz</code>
-   */
-  def reduceToSize(sz: Int) {
-    if (sz > size0) throw new IllegalArgumentException
-    size0 = sz
+  def update(idx: Int, elem: A) {
+    if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
+    array(idx) = elem.asInstanceOf[AnyRef]
   }
 
   /** Fills the given array <code>xs</code> with the elements of
@@ -56,25 +62,35 @@ trait ResizableArray[A] extends RandomAccessSeq[A] {
 
   /** Copy all elements to a buffer
    *  @param   The buffer to which elements are copied
-   */
   override def copyToBuffer[B >: A](dest: Buffer[B]) {
-    dest.++=(runtime.ScalaRunTime.boxArray(array).asInstanceOf[Array[B]], 0, size0)
+    dest ++= (array: Sequence[AnyRef]).asInstanceOf[Sequence[B]]
   }
-
-  /** Returns a new iterator over all elements of this resizable array.
    */
-  override def elements: Iterator[A] = new Iterator[A] {
+
+  override def foreach(f: A => Unit) {
     var i = 0
-    def hasNext: Boolean = i < size0
-    def next(): A = { i = i + 1; array(i - 1).asInstanceOf[A] }
+    while (i < size) {
+      f(array(i).asInstanceOf[A])
+      i += 1
+    }
   }
 
   //##########################################################################
 
+  /** remove elements of this array at indices after <code>sz</code>
+   */
+  def reduceToSize(sz: Int) {
+    require(sz <= size0)
+    while (size0 > sz) {
+      size0 -= 1
+      array(size0) = null
+    }
+  }
+
   /** ensure that the internal array has at n cells */
   protected def ensureSize(n: Int) {
     if (n > array.length) {
-      var newsize = if (array.length == 0) 2 else array.length * 2
+      var newsize = array.length * 2
       while (n > newsize)
         newsize = newsize * 2
       val newar: Array[AnyRef] = new Array(newsize)
@@ -97,3 +113,9 @@ trait ResizableArray[A] extends RandomAccessSeq[A] {
     Array.copy(array, m, array, n, len)
   }
 }
+
+object ResizableArray extends SequenceFactory[ResizableArray] {
+  type Coll = Vector[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Vector[A], Coll] = new BuilderFactory[A, Vector[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, ResizableArray[A], Any] = new ArrayBuffer[A]
+}
diff --git a/src/library/scala/collection/mutable/RevertableHistory.scala b/src/library/scala/collection/mutable/RevertibleHistory.scala
index 0996eb64c8..6561a74c2c 100644..100755
--- a/src/library/scala/collection/mutable/RevertableHistory.scala
+++ b/src/library/scala/collection/mutable/RevertibleHistory.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -6,7 +7,7 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id$
+// $Id: RevertableHistory.scala 16893 2009-01-13 13:09:22Z cunei $
 
 
 package scala.collection.mutable
@@ -31,3 +32,4 @@ class RevertableHistory[A <: Undoable, B] extends History[A, B] with Undoable {
     old.foreach { case (sub, event) => event.undo }
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/Scriptable.scala b/src/library/scala/collection/mutable/Scriptable.scala
index 0a9b9b8525..f2341d4e4f 100644
--- a/src/library/scala/collection/mutable/Scriptable.scala
+++ b/src/library/scala/collection/mutable/Scriptable.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -24,3 +25,4 @@ trait Scriptable[A] {
      */
     def <<(cmd: A): Unit
 }
+*/
diff --git a/src/library/scala/collection/mutable/Sequence.scala b/src/library/scala/collection/mutable/Sequence.scala
new file mode 100755
index 0000000000..01293924ac
--- /dev/null
+++ b/src/library/scala/collection/mutable/Sequence.scala
@@ -0,0 +1,27 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.mutable
+
+import generic._
+
+/** A subtrait of collection.Sequence which represents sequences
+ *  that can be mutated.
+ *  The class adds an `update` method to collection.Sequence.
+ */
+trait Sequence[A] extends Iterable[A] with collection.Sequence[A] with SequenceTemplate[A, Sequence[A]] with Unhashable {
+  override protected[this] def newBuilder = Sequence.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Sequence[B], Any] = Sequence.newBuilder[B]
+
+  def update(idx: Int, elem: A)
+}
+
+object Sequence extends SequenceFactory[Sequence] {
+  type Coll = Sequence[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Sequence[A], Coll] = new BuilderFactory[A, Sequence[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Sequence[A], Any] = new ArrayBuffer
+}
diff --git a/src/library/scala/collection/mutable/Set.scala b/src/library/scala/collection/mutable/Set.scala
index 7bc6be9292..d75b816564 100644
--- a/src/library/scala/collection/mutable/Set.scala
+++ b/src/library/scala/collection/mutable/Set.scala
@@ -11,21 +11,7 @@
 
 package scala.collection.mutable
 
-import Predef._
-
-
-/** The canonical factory methods for <a href="Set.html">mutable sets</a>.
- *  Currently these return <a href="HashSet.html">HashSet's</a>.
- */
-object Set {
-
-  /** The empty map of this type; this is implemented as a hashtable */
-  def empty[A]: Set[A] = new HashSet[A]
-
-  /** The canonical factory for this type
-   */
-  def apply[A](elems: A*) = empty[A] ++ elems
-}
+import generic._
 
 /** This class represents mutable sets. Concrete set implementations
  *  just have to provide functionality for the abstract methods in
@@ -33,11 +19,22 @@ object Set {
  *  <code>scala.collection.Set</code></a> as well as for <code>+=</code>,
  *  <code>-= and <code>clear</code>.
  *
- *  @author  Matthias Zenger
- *  @version 1.1, 09/05/2004
+ *  @author Matthias Zenger
+ *  @author Martin Odersky
+ *  @version 2.8
  */
-@cloneable
-trait Set[A] extends collection.Set[A] with Scriptable[Message[A]] with CloneableCollection {
+trait Set[A] extends Iterable[A]
+                with collection.Set[A]
+                with SetTemplate[A, Set[A]]
+                with Growable[A]
+                with Shrinkable[A]
+                with Cloneable[Set[A]]
+                with Unhashable {
+self =>
+
+  override def empty = Set.empty
+
+  override def traversibleBuilder[B]: Builder[B, Set[B], Any] = Set.newBuilder[B]
 
   /** This method allows one to add or remove an element <code>elem</code>
    *  from this set depending on the value of parameter <code>included</code>.
@@ -49,168 +46,69 @@ trait Set[A] extends collection.Set[A] with Scriptable[Message[A]] with Cloneabl
     if (included) this += elem else this -= elem
   }
 
-  /** Add a new element to the set.
+  /** Adds a new element to the set.
    *
    *  @param elem the element to be added
    */
   def +=(elem: A)
 
-  /** Add two or more elements to this set.
-   *  @param    elem1 the first element.
-   *  @param    elem2 the second element.
-   *  @param    elems the remaining elements.
-   */
-  def += (elem1: A, elem2: A, elems: A*) { this += elem1; this += elem2; this ++= elems }
-
-  /** Add all the elements provided by an iterator
-   *  of the iterable object <code>that</code> to the set.
-   *  @param elems  the iterable object containing the elements to be added
-   */
-  def ++=(elems: Iterable[A]): Unit = ++=(elems.elements)
-
-  /** Add all the elements provided by an iterator
-   *  <code>elems</code> to the set.
-   *  @param elems  the iterator containing the elements to be added
-   */
-  def ++=(elems: Iterator[A]) { elems foreach += }
-
-  /** Add a new element to the set.
-   *  @return the set itself with the element added.
-   *
-   *  @param elem the element to be added
-   */
-  def + (elem: A): Set[A] = { +=(elem); this }
-
-  /** Add two or more elements to this set.
-   *  @param    elem1 the first element.
-   *  @param    kv2 the second element.
-   *  @param    kvs the remaining elements.
-   *  @return the set itself with the elements added.
-   */
-  def + (elem1: A, elem2: A, elems: A*): Set[A] = { this.+=(elem1, elem2, elems: _*); this }
-
-  /** Add all the elements provided by an iterator
-   *  of the iterable object <code>elems</code> to the set.
-   *
-   *  @param elems  the iterable object containing the elements to be added
-   *  @return the set itself with the elements added.
-   */
-  def ++ (elems: Iterable[A]): Set[A] = { this ++= elems; this }
-
-  /** Add all the elements provided by an iterator
-   *  <code>elems</code> to the set.
-   *  @param elems  the iterator containing the elements to be added
-   */
-  def ++ (elems: Iterator[A]): Set[A] = { this ++= elems; this }
-
-  /** <code>incl</code> can be used to add many elements to the set
-   *  at the same time.
-   *  @deprecated   use <code>++=</code> instead
-   */
-  @deprecated
-  def incl(elems: A*): Unit = ++=(elems.elements)
-
   /** Removes a single element from a set.
    *  @param elem  The element to be removed.
    */
   def -=(elem: A)
 
-  /** Remove two or more elements from this set.
-   *  @param    elem1 the first element.
-   *  @param    elem2 the second element.
-   *  @param    elems the remaining elements.
-   */
-  def -= (elem1: A, elem2: A, elems: A*) { this -= elem1; this -= elem2; this --= elems }
-
-  /** Remove all the elements provided by an iterator
-   *  of the iterable object <code>elems</code> from the set.
-   */
-  def --=(elems: Iterable[A]): Unit = --=(elems.elements)
-
-  /** Remove all the elements provided by an iterator
-   *  <code>elems</code> from the set.
-   */
-  def --=(elems: Iterator[A]) { elems foreach -= }
-
-  /** Remove a new element from the set.
-   *  @return the set itself with the element removed.
+  /** Adds a new element to the set and returns the set itself.
    *
-   *  @param elem the element to be removed
-   */
-  def - (elem: A): Set[A] = { -=(elem); this }
-
-  /** Remove two or more elements from this set.
-   *  @param    elem1 the first element.
-   *  @param    elem2 the second element.
-   *  @param    elems the remaining elements.
-   *  @return the set itself with the elements removed.
+   *  @param elem the element to be added
    */
-  def - (elem1: A, elem2: A, elems: A*): Set[A] = { this.-=(elem1, elem2, elems: _*); this }
+  override def +(elem: A): this.type = { +=(elem); this }
 
-  /** Remove all the elements provided by an iterator
-   *  of the iterable object <code>elems</code> from the set.
+  /** Removed a new element from the set and returns the set itself.
    *
-   *  @param elems An iterable object containing the elements to remove from the set.
-   *  @return the set itself with the elements removed.
-   */
-  def -- (elems: Iterable[A]): Set[A] = { this --= elems; this }
-
-  /** Remove all the elements provided by an iterator
-   *  <code>elems</code> from the set.
-   *  @param elems An iterator containing the elements to remove from the set.
-   *  @return the set itself with the elements removed.
-   */
-  def -- (elems: Iterator[A]): Set[A] = { this --= elems; this }
-
-  /** <code>excl</code> removes many elements from the set.
+   *  @param elem the element to be added
    */
-  @deprecated
-  def excl(elems: A*): Unit = --=(elems.elements)
+  override def -(elem: A): this.type = { -=(elem); this }
 
   /** This method computes an intersection with set <code>that</code>.
    *  It removes all the elements that are not present in <code>that</code>.
    *
    *  @param that the set to intersect with.
    */
-  def intersect(that: Set[A]) { retain(that.contains) }
+  override def intersect(that: collection.Set[A]): this.type = { retain(that.contains); this }
 
   /** Method <code>retain removes all elements from the set for
    *  which the predicate <code>p</code> yields the value <code>false</code>.
    */
-  def retain(p: A => Boolean): Unit = toList.foreach {
-    elem => if (!p(elem)) -=(elem)
-  }
+  def retain(p: A => Boolean): Unit = for (elem <- this.toList) if (!p(elem)) this -= elem
 
   /** Removes all elements from the set. After this operation is completed,
    *  the set will be empty.
    */
-  def clear() { elements foreach -= }
+  def clear() { foreach(-=) }
+
+  override def clone(): Set[A] = { val b = newBuilder; b ++= this; b.result }
 
   /** Send a message to this scriptable object.
    *
    *  @param cmd  the message to send.
    *  @throws <code>Predef.UnsupportedOperationException</code>
    *  if the message was not understood.
-   */
-  def <<(cmd: Message[A]): Unit = cmd match {
+   def <<(cmd: Message[A]): Unit = cmd match {
     case Include(elem) => this += elem
     case Remove(elem) => this -= elem
     case Reset() => clear
     case s: Script[_] => s.elements foreach <<
     case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
   }
+  */
+}
 
-  /** Return a clone of this set.
-   *
-   *  @return  a set with the same elements.
-   */
-  override def clone(): Set[A] = super.clone().asInstanceOf[Set[A]]
-
-  /** Return a read-only projection of this set */
-  def readOnly : scala.collection.Set[A] = new scala.collection.Set[A] {
-    def contains(item : A) = Set.this.contains(item)
-    override def toString = "ro-" + Set.this.toString
-    override def size = Set.this.size
-    override def elements = Set.this.elements
-  }
+/** The canonical factory methods for <a href="Set.html">mutable sets</a>.
+ *  Currently this returns a HashSet.
+ */
+object Set extends SetFactory[Set] {
+  type Coll = Set[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Set[A], Coll] = new BuilderFactory[A, Set[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def empty[A]: Set[A] = HashSet.empty[A]
 }
+
diff --git a/src/library/scala/collection/mutable/SetProxy.scala b/src/library/scala/collection/mutable/SetProxy.scala
index 0e693b7302..e13f18691b 100644
--- a/src/library/scala/collection/mutable/SetProxy.scala
+++ b/src/library/scala/collection/mutable/SetProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -54,3 +55,4 @@ trait SetProxy[A] extends Set[A] with collection.SetProxy[A] {
     def self = SetProxy.this.self.clone()
   }
 }
+*/
diff --git a/src/library/scala/collection/mutable/SingleLinkedList.scala b/src/library/scala/collection/mutable/SingleLinkedList.scala
deleted file mode 100644
index ac07066432..0000000000
--- a/src/library/scala/collection/mutable/SingleLinkedList.scala
+++ /dev/null
@@ -1,62 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala.collection.mutable
-
-/** This extensible class may be used as a basis for implementing linked
- *  list. Type variable <code>A</code> refers to the element type of the
- *  list, type variable <code>This</code> is used to model self types of
- *  linked lists.
- *
- *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
- */
-abstract class SingleLinkedList[A, This >: Null <: SingleLinkedList[A, This]]
-         extends AnyRef with Seq[A]
-{ self: This =>
-
-  var elem: A
-
-  var next: This
-
-  def length: Int = 1 + (if (next eq null) 0 else next.length)
-
-  def append(that: This): Unit =
-    if (next eq null) next = that else next.append(that)
-
-  def insert(that: This): Unit = if (that ne null) {
-    that.append(next)
-    next = that
-  }
-
-  def apply(n: Int): A =
-    if (n == 0) elem
-    else if (next eq null) throw new IndexOutOfBoundsException("unknown element")
-    else next.apply(n - 1)
-
-  def get(n: Int): Option[A] =
-    if (n == 0) Some(elem)
-    else if (next eq null) None
-    else next.get(n - 1)
-
-  override def elements: Iterator[A] = new Iterator[A] {
-    var elems = SingleLinkedList.this
-    def hasNext = (elems ne null)
-    def next = {
-      val res = elems.elem
-      elems = elems.next
-      res;
-    }
-  }
-
-  override def toList: List[A] = elements toList
-
-}
diff --git a/src/library/scala/collection/mutable/Stack.scala b/src/library/scala/collection/mutable/Stack.scala
index 2faf1964c8..0d554e01da 100644
--- a/src/library/scala/collection/mutable/Stack.scala
+++ b/src/library/scala/collection/mutable/Stack.scala
@@ -11,57 +11,70 @@
 
 package scala.collection.mutable
 
+import generic._
 
 /** A stack implements a data structure which allows to store and retrieve
  *  objects in a last-in-first-out (LIFO) fashion.
  *
  *  @author  Matthias Zenger
- *  @version 1.1, 03/05/2004
+ *  @author  Martin Odersky
+ *  @version 2.8
  */
 @serializable @cloneable
-class Stack[A] extends Seq[A] with CloneableCollection {
-  private var stack: immutable.Stack[A] = immutable.Stack.Empty
+class Stack[A] private (var elems: List[A]) extends collection.Sequence[A] with Cloneable[Stack[A]] {
+
+  def this() = this(Nil)
 
   /** Checks if the stack is empty.
    *
    *  @return true, iff there is no element on the stack
    */
-  override def isEmpty: Boolean = stack.isEmpty
+  override def isEmpty: Boolean = elems.isEmpty
 
-  override def length = stack.length
+  /** The number of elements in the stack */
+  override def length = elems.length
 
-  override def apply(index: Int) = stack(index)
+  /** Retrieve n'th element from stack, where top of stack has index 0 */
+  override def apply(index: Int) = elems(index)
 
-  /** Pushes a single element on top of the stack.
+  /** Push an element on the stack.
    *
-   *  @param  elem        the element to push onto the stack
+   *  @param   elem       the element to push on the stack.
+   *  @return the stack with the new element on top.
    */
-  def +=(elem: A) {
-    this push elem
-  }
+  def push(elem: A): this.type = { elems = elem :: elems; this }
 
-  /** Pushes all elements provided by an <code>Iterable</code> object
-   *  on top of the stack. The elements are pushed in the order they
-   *  are given out by the iterator.
+  /** Push two or more elements onto the stack. The last element
+   *  of the sequence will be on top of the new stack.
    *
-   *  @param  iter        an iterable object
+   *  @param   elems      the element sequence.
+   *  @return the stack with the new elements on top.
    */
-  def ++=(iter: Iterable[A]): Unit = stack = stack ++ iter
+  def push(elem1: A, elem2: A, elems: A*): this.type = this.push(elem1).push(elem2).pushAll(elems)
 
-  /** Pushes all elements provided by an iterator
-   *  on top of the stack. The elements are pushed in the order they
-   *  are given out by the iterator.
+  /** Push all elements provided by the given iterator object onto
+   *  the stack. The last element returned by the iterator
+   *  will be on top of the new stack.
    *
-   *  @param  iter        an iterator
+   *  @param   elems      the iterator object.
+   *  @return the stack with the new elements on top.
+   *  @deprecated
    */
-  def ++=(it: Iterator[A]): Unit = stack = stack ++ it
+  def pushAll(elems: Iterator[A]): this.type = { for (elem <- elems) { push(elem); () }; this }
 
-  /** Pushes a sequence of elements on top of the stack. The first element
-   *  is pushed first, etc.
+  /** Push all elements provided by the given iterable object onto
+   *  the stack. The last element returned by the traversible object
+   *  will be on top of the new stack.
    *
-   *  @param  elems       a sequence of elements
+   *  @param   elems      the iterable object.
+   *  @return the stack with the new elements on top.
    */
-  def push(elems: A*): Unit = (this ++= elems)
+  def pushAll(elems: collection.Traversible[A]): this.type = { for (elem <- elems) { push(elem); () }; this }
+
+  /** @deprecated use pushAll */
+  @deprecated def ++=(it: Iterator[A]): Unit = pushAll(it)
+  /** @deprecated use pushAll */
+  @deprecated def ++=(it: Iterable[A]): Unit = pushAll(it)
 
   /** Returns the top element of the stack. This method will not remove
    *  the element from the stack. An error is signaled if there is no
@@ -71,7 +84,7 @@ class Stack[A] extends Seq[A] with CloneableCollection {
    *  @return the top element
    */
   def top: A =
-    stack.top
+    elems.head
 
   /** Removes the top element from the stack.
    *
@@ -79,8 +92,8 @@ class Stack[A] extends Seq[A] with CloneableCollection {
    *  @return the top element
    */
   def pop(): A = {
-    val res = stack.top
-    stack = stack.pop
+    val res = elems.head
+    elems = elems.tail
     res
   }
 
@@ -88,52 +101,27 @@ class Stack[A] extends Seq[A] with CloneableCollection {
    * Removes all elements from the stack. After this operation completed,
    * the stack will be empty.
    */
-  def clear(): Unit = stack = immutable.Stack.Empty
+  def clear(): Unit = elems = Nil
 
   /** Returns an iterator over all elements on the stack. This iterator
    *  is stable with respect to state changes in the stack object; i.e.
    *  such changes will not be reflected in the iterator. The iterator
-   *  issues elements in the order they were inserted into the stack
-   *  (FIFO order).
+   *  issues elements in the reversed order they were inserted into the stack
+   *  (LIFO order).
    *
    *  @return an iterator over all stack elements.
    */
-  override def elements: Iterator[A] = stack.elements
+  override def elements: Iterator[A] = elems.elements
 
-  /** Creates a list of all stack elements in FIFO order.
+  /** Creates a list of all stack elements in LIFO order.
    *
    *  @return the created list.
    */
-  override def toList: List[A] = stack.toList
-
-  /** Checks if two stacks are structurally identical.
-   *
-   *  @return true, iff both stacks contain the same sequence of elements.
-   */
-  override def equals(obj: Any): Boolean = obj match {
-    case that: Stack[_] =>
-      this.stack == that.stack
-    case _ =>
-      false
-  }
-
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use mutable stacks as keys in hash tables.
-   *
-   *  @return never.
-   */
-  override def hashCode(): Int =
-    throw new UnsupportedOperationException("unsuitable as hash key")
+  override def toList: List[A] = elems
 
   /** This method clones the stack.
    *
    *  @return  a stack with the same elements.
    */
-  override def clone(): Stack[A] = {
-    val res = new Stack[A]
-    res ++= this
-    res
-  }
-
-  override protected def stringPrefix: String = "Stack"
+  override def clone(): Stack[A] = new Stack[A](elems)
 }
diff --git a/src/library/scala/collection/mutable/StackProxy.scala b/src/library/scala/collection/mutable/StackProxy.scala
index 2fedc50542..1833af0f33 100644
--- a/src/library/scala/collection/mutable/StackProxy.scala
+++ b/src/library/scala/collection/mutable/StackProxy.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -109,3 +110,4 @@ trait StackProxy[A] extends Stack[A] with SeqProxy[A] {
     def self = StackProxy.this.self.clone()
   }
 }
+*/
diff --git a/src/library/scalax/collection/mutable/StringBuilder.scala b/src/library/scala/collection/mutable/StringBuilder.scala
index 386f316f27..d70261f84b 100755
--- a/src/library/scalax/collection/mutable/StringBuilder.scala
+++ b/src/library/scala/collection/mutable/StringBuilder.scala
@@ -9,17 +9,16 @@
 // $Id: StringBuilder.scala 16884 2009-01-09 16:52:09Z cunei $
 
 
-package scalax.collection.mutable
-
-import scalax.collection.generic._
-import scalax.runtime._
+package scala.collection.mutable
 
+import collection.generic._
+import scala.runtime.RichString
 
 /** <p>
  *    A mutable sequence of characters.  This class provides an API compatible
  *    with <a class="java/lang/StringBuilder" href="" target="_top">
  *    <code>java.lang.StringBuilder</code></a>.
- *  </p>
+ *  </p>generic/
  *
  *  @author Stephane Micheloud
  *  @author Martin Odersky
@@ -28,12 +27,10 @@ import scalax.runtime._
 @serializable
 @SerialVersionUID(0 - 8525408645367278351L)
 final class StringBuilder(initCapacity: Int, private val initValue: String)
-      extends PartialFunction[Int, Char]
-         with Growable[Any]
-         with java.lang.CharSequence {
-  require(initCapacity > 0)
+      extends Builder[Char, String, Any]
+         with Vector[Char] {
 
-  type Array[T] = scala.Array[T] // !!!
+  require(initCapacity > 0)
 
   /** The value is used for character storage. */
   private var array = new Array[Char](initCapacity + initValue.length)
@@ -147,10 +144,6 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
   /** Same as <code>charAt</code>. */
   def apply(i: Int): Char = charAt(i)
 
-  /** Does builder contain an element at given index `idx`?
-   */
-  def isDefinedAt(i: Int): Boolean = 0 <= i && i < count
-
   /** <p>
    *    Removes the <code>Char</code> at the specified position in this
    *    sequence. This sequence is shortened by one <code>Char</code>.
@@ -233,7 +226,10 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
 
   /* Appends the string representation of the <code>Any</code> argument.
    */
-  def +=(x: Any) { append(x) }
+  def +=(x: Char) { append(x) }
+
+  def +(x: Char): this.type = { +=(x); this }
+
 
   /** <p>
    *    Appends the string representation of the <code>Any</code>
@@ -367,7 +363,7 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
    *   @param  x  a <code>Boolean</code>.
    *   @return    a reference to this object.
    */
-  def append(x: Boolean): StringBuilder = append(String.valueOf(this))
+  def append(x: Boolean): StringBuilder = append(String.valueOf(x))
   def append(x: Byte): StringBuilder = append(String.valueOf(x))
 
   def append(x: Char): StringBuilder = {
@@ -807,7 +803,7 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
    *
    *  @return  a reference to this object.
    */
-  def reverse(): StringBuilder = {
+  override def reverse(): StringBuilder = {
     var hasSurrogate = false
     val n = count - 1
     var j = (n-1) >> 1
@@ -816,8 +812,8 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
       val temp2 = array(n - j)
       if (!hasSurrogate)
         hasSurrogate =
-          (temp >= Character.MIN_HIGH_SURROGATE && temp <= Character.MAX_LOW_SURROGATE) ||
-       	  (temp2 >= Character.MIN_HIGH_SURROGATE && temp2 <= Character.MAX_LOW_SURROGATE)
+          (temp >= StringBuilder.MIN_SURROGATE && temp <= StringBuilder.MAX_SURROGATE) ||
+       	  (temp2 >= StringBuilder.MIN_SURROGATE && temp2 <= StringBuilder.MAX_SURROGATE)
       array(j) = temp2
       array(n - j) = temp
       j -= 1
@@ -827,9 +823,9 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
       var i = 0
       while (i < count - 1) {
         val c2 = array(i)
-	if (Character.isLowSurrogate(c2)) {
+	if (StringBuilder.isLowSurrogate(c2)) {
           val c1 = array(i + 1)
-          if (Character.isHighSurrogate(c1)) {
+          if (StringBuilder.isHighSurrogate(c1)) {
             array(i) = c1; i += 1
             array(i) = c2
           }
@@ -849,7 +845,9 @@ final class StringBuilder(initCapacity: Int, private val initValue: String)
    *
    *  @return  a string representation of this sequence of characters.
    */
-  override def toString(): String = new String(array, 0, count)
+  override def toString: String = new String(array, 0, count)
+
+  def result(): String = toString
 }
 
 
@@ -857,6 +855,23 @@ object StringBuilder {
 
   type Array[T] = scala.Array[T] // !!!
 
+  private val MIN_HIGH_SURROGATE = '\uD800'
+  private val MAX_HIGH_SURROGATE = '\uDBFF'
+
+  private val MIN_LOW_SURROGATE = '\uDC00'
+  private val MAX_LOW_SURROGATE = '\uDFFF'
+
+  // constants <code>java.langCharacter.MIN-/MAX_SURROGATE</code> exist since 1.5
+  private val MIN_SURROGATE = MIN_HIGH_SURROGATE
+  private val MAX_SURROGATE = MAX_LOW_SURROGATE
+
+  // methods <code>java.langCharacter.isLow-/isHighSurrogate</code> exist since 1.5
+  private def isLowSurrogate(ch: Char): Boolean =
+    MIN_LOW_SURROGATE <= ch && ch <= MAX_LOW_SURROGATE
+
+  private def isHighSurrogate(ch: Char): Boolean =
+    MIN_HIGH_SURROGATE <= ch && ch <= MAX_HIGH_SURROGATE
+
   // method <code>java.util.Arrays.copyOf</code> exists since 1.6
   private def copyOf(src: Array[Char], newLength: Int): Array[Char] = {
     val dest = new Array[Char](newLength)
diff --git a/src/library/scala/collection/mutable/Subscriber.scala b/src/library/scala/collection/mutable/Subscriber.scala
index 751fe12498..c3d5723660 100644
--- a/src/library/scala/collection/mutable/Subscriber.scala
+++ b/src/library/scala/collection/mutable/Subscriber.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -23,3 +24,4 @@ package scala.collection.mutable
 trait Subscriber[-A, -B] {
   def notify(pub: B, event: A): Unit
 }
+*/
diff --git a/src/library/scala/collection/mutable/SynchronizedBuffer.scala b/src/library/scala/collection/mutable/SynchronizedBuffer.scala
index 199c44db67..03978d9d71 100644
--- a/src/library/scala/collection/mutable/SynchronizedBuffer.scala
+++ b/src/library/scala/collection/mutable/SynchronizedBuffer.scala
@@ -20,6 +20,8 @@ package scala.collection.mutable
  */
 trait SynchronizedBuffer[A] extends Buffer[A] {
 
+  import collection.Traversible
+
   abstract override def length: Int = synchronized {
     super.length
   }
@@ -55,7 +57,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *
    *  @param iter  the iterable object.
    */
-  override def ++(iter: Iterable[A]): Buffer[A] = synchronized {
+  override def ++(iter: Traversible[A]): Buffer[A] = synchronized {
     super.++(iter)
   }
 
@@ -64,7 +66,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *
    *  @param iter  the iterable object.
    */
-  override def ++=(iter: Iterable[A]): Unit = synchronized {
+  override def ++=(iter: Traversible[A]): Unit = synchronized {
     super.++=(iter)
   }
 
@@ -81,7 +83,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *
    *  @param iter  the iterable object.
    */
-  override def appendAll(iter: Iterable[A]): Unit = synchronized {
+  override def appendAll(iter: Traversible[A]): Unit = synchronized {
     super.appendAll(iter)
   }
 
@@ -100,7 +102,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *
    *  @param iter  the iterable object.
    */
-  override def ++:(iter: Iterable[A]): Buffer[A] = synchronized {
+  override def ++:(iter: Traversible[A]): Buffer[A] = synchronized {
     super.++:(iter)
   }
 
@@ -118,7 +120,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *
    *  @param iter  the iterable object.
    */
-  override def prependAll(elems: Iterable[A]): Unit = synchronized {
+  override def prependAll(elems: Traversible[A]): Unit = synchronized {
     super.prependAll(elems)
   }
 
@@ -140,7 +142,7 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
    *  @param n     the index where a new element will be inserted.
    *  @param iter  the iterable object providing all elements to insert.
    */
-  abstract override def insertAll(n: Int, iter: Iterable[A]): Unit = synchronized {
+  abstract override def insertAll(n: Int, iter: Traversible[A]): Unit = synchronized {
      super.insertAll(n, iter)
   }
 
@@ -167,11 +169,11 @@ trait SynchronizedBuffer[A] extends Buffer[A] {
   abstract override def clear(): Unit = synchronized {
     super.clear
   }
-
+/* TODO: Reintegrate
   override def <<(cmd: Message[(Location, A)]): Unit = synchronized {
     super.<<(cmd)
   }
-
+*/
   /** Return a clone of this buffer.
    *
    *  @return an <code>ArrayBuffer</code> with the same elements.
diff --git a/src/library/scala/collection/mutable/SynchronizedMap.scala b/src/library/scala/collection/mutable/SynchronizedMap.scala
index 450eaa5814..6ca07f4fa5 100644
--- a/src/library/scala/collection/mutable/SynchronizedMap.scala
+++ b/src/library/scala/collection/mutable/SynchronizedMap.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -20,6 +21,10 @@ package scala.collection.mutable
  */
 trait SynchronizedMap[A, B] extends Map[A, B] {
 
+  import collection.Traversible
+
+  override def mapBuilder[A, B]: Builder[(A, B), SynchronizedMap[A, B], Any] = SynchronizedMap.newBuilder[A, B]
+
   abstract override def size: Int = synchronized {
     super.size
   }
@@ -81,7 +86,7 @@ trait SynchronizedMap[A, B] extends Map[A, B] {
     super.+=(kv1, kv2, kvs: _*)
   }
 
-  override def ++=(map: Iterable[(A, B)]): Unit = synchronized {
+  override def ++=(map: Traversible[(A, B)]): Unit = synchronized {
     super.++=(map)
   }
 
@@ -89,11 +94,6 @@ trait SynchronizedMap[A, B] extends Map[A, B] {
     super.++=(it)
   }
 
-  @deprecated
-  override def incl(mappings: (A, B)*): Unit = synchronized {
-    super.incl(mappings: _*)
-  }
-
   abstract override def -=(key: A): Unit = synchronized {
     super.-=(key)
   }
@@ -102,7 +102,7 @@ trait SynchronizedMap[A, B] extends Map[A, B] {
     super.-=(key1, key2, keys: _*)
   }
 
-  override def --=(keys: Iterable[A]): Unit = synchronized {
+  override def --=(keys: Traversible[A]): Unit = synchronized {
     super.--=(keys)
   }
 
@@ -110,24 +110,19 @@ trait SynchronizedMap[A, B] extends Map[A, B] {
     super.--=(it)
   }
 
-  @deprecated
-  override def excl(keys: A*): Unit = synchronized {
-    super.excl(keys: _*)
-  }
-
   override def clear(): Unit = synchronized {
     super.clear
   }
-
+/* TODO: Reintegrate
   override def getOrElseUpdate(key: A, default: => B): B = synchronized {
     super.getOrElseUpdate(key, default)
   }
-
-  override def transform(f: (A, B) => B): Unit = synchronized {
+*/
+  override def transform(f: (A, B) => B): this.type = synchronized[this.type] {
     super.transform(f)
   }
 
-  override def retain(p: (A, B) => Boolean): Unit = synchronized {
+  override def retain(p: (A, B) => Boolean): this.type = synchronized[this.type] {
     super.retain(p)
   }
 
@@ -139,15 +134,23 @@ trait SynchronizedMap[A, B] extends Map[A, B] {
     super.equals(that)
   }
 
-  override def hashCode(): Int = synchronized {
-    super.hashCode()
-  }
-
+/* TODO: Reintegrate
   override def <<(cmd: Message[(A, B)]): Unit = synchronized {
     super.<<(cmd)
   }
-
+*/
   override def clone(): Map[A, B] = synchronized {
     super.clone()
   }
 }
+
+/* Factory object for `Map` class
+ * Currently this returns a HashMap.
+ */
+object SynchronizedMap extends MutableMapFactory[SynchronizedMap] {
+  type Coll = Map[_, _]
+  implicit def implicitBuilder[A, B]: Builder[(A, B), Map[A, B], Coll] = from.mapBuilder[A, B]
+  def empty[A, B]: Map[A, B] = new HashMap[A, B] with SynchronizeddMap[A, B]
+}
+
+*/
diff --git a/src/library/scala/collection/mutable/SynchronizedPriorityQueue.scala b/src/library/scala/collection/mutable/SynchronizedPriorityQueue.scala
index 3c8bbfe5aa..f500b46aa0 100644
--- a/src/library/scala/collection/mutable/SynchronizedPriorityQueue.scala
+++ b/src/library/scala/collection/mutable/SynchronizedPriorityQueue.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -84,16 +85,10 @@ class SynchronizedPriorityQueue[A <% Ordered[A]] extends PriorityQueue[A] {
    */
   override def equals(that: Any): Boolean = synchronized { super.equals(that) }
 
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use mutable queues as keys in hash tables.
-   *
-   *  @return never.
-   */
-  override def hashCode(): Int = synchronized { super.hashCode() }
-
   /** Returns a textual representation of a queue as a string.
    *
    *  @return the string representation of this queue.
    */
   override def toString(): String = synchronized { super.toString() }
 }
+*/
diff --git a/src/library/scala/collection/mutable/SynchronizedQueue.scala b/src/library/scala/collection/mutable/SynchronizedQueue.scala
index b31ab5e5dd..7ef88e867f 100644
--- a/src/library/scala/collection/mutable/SynchronizedQueue.scala
+++ b/src/library/scala/collection/mutable/SynchronizedQueue.scala
@@ -20,6 +20,7 @@ package scala.collection.mutable
  *  @version 1.0, 03/05/2004
  */
 class SynchronizedQueue[A] extends Queue[A] {
+  import collection.Traversible
 
   /** Checks if the queue is empty.
    *
@@ -39,7 +40,7 @@ class SynchronizedQueue[A] extends Queue[A] {
    *
    *  @param  iter        an iterable object
    */
-  override def ++=(iter: Iterable[A]): Unit = synchronized { super.++=(iter) }
+  override def ++=(iter: Traversible[A]): Unit = synchronized { super.++=(iter) }
 
   /** Adds all elements provided by an iterator
    *  at the end of the queue. The elements are prepended in the order they
@@ -80,13 +81,6 @@ class SynchronizedQueue[A] extends Queue[A] {
    */
   override def equals(that: Any): Boolean = synchronized { super.equals(that) }
 
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use mutable queues as keys in hash tables.
-   *
-   *  @return never.
-   */
-  override def hashCode(): Int = synchronized { super.hashCode() }
-
   /** Returns a textual representation of a queue as a string.
    *
    *  @return the string representation of this queue.
diff --git a/src/library/scala/collection/mutable/SynchronizedSet.scala b/src/library/scala/collection/mutable/SynchronizedSet.scala
index 8003e5a262..f355e5879d 100644
--- a/src/library/scala/collection/mutable/SynchronizedSet.scala
+++ b/src/library/scala/collection/mutable/SynchronizedSet.scala
@@ -19,6 +19,7 @@ package scala.collection.mutable
  *  @version 1.0, 08/07/2003
  */
 trait SynchronizedSet[A] extends Set[A] {
+  import collection.Traversible
 
   abstract override def size: Int = synchronized {
     super.size
@@ -40,7 +41,7 @@ trait SynchronizedSet[A] extends Set[A] {
     super.+=(elem)
   }
 
-  override def ++=(that: Iterable[A]) = synchronized {
+  override def ++=(that: Traversible[A]) = synchronized {
     super.++=(that)
   }
 
@@ -48,15 +49,11 @@ trait SynchronizedSet[A] extends Set[A] {
     super.++=(it)
   }
 
-  override def incl(elems: A*): Unit = synchronized {
-    super.++=(elems)
-  }
-
   abstract override def -=(elem: A): Unit = synchronized {
     super.-=(elem)
   }
 
-  override def --=(that: Iterable[A]) = synchronized {
+  override def --=(that: Traversible[A]) = synchronized {
     super.--=(that)
   }
 
@@ -64,11 +61,7 @@ trait SynchronizedSet[A] extends Set[A] {
     super.--=(it)
   }
 
-  override def excl(elems: A*): Unit = synchronized {
-    super.--=(elems)
-  }
-
-  override def intersect(that: Set[A]) = synchronized {
+  override def intersect(that: collection.Set[A]) = synchronized[this.type] {
     super.intersect(that)
   }
 
@@ -96,10 +89,11 @@ trait SynchronizedSet[A] extends Set[A] {
     super.toString
   }
 
+/* TODO: Reintegrate
   override def <<(cmd: Message[A]): Unit = synchronized {
     super.<<(cmd)
   }
-
+*/
   override def clone(): Set[A] = synchronized {
     super.clone()
   }
diff --git a/src/library/scala/collection/mutable/SynchronizedStack.scala b/src/library/scala/collection/mutable/SynchronizedStack.scala
index 572e689f9c..6d90f6a531 100644
--- a/src/library/scala/collection/mutable/SynchronizedStack.scala
+++ b/src/library/scala/collection/mutable/SynchronizedStack.scala
@@ -20,6 +20,7 @@ package scala.collection.mutable
  *  @version 1.0, 03/05/2004
  */
 class SynchronizedStack[A] extends Stack[A] {
+  import collection.Traversible
 
   /** Checks if the stack is empty.
    *
@@ -31,30 +32,31 @@ class SynchronizedStack[A] extends Stack[A] {
    *
    *  @param  elem        the element to push onto the stack
    */
-  override def +=(elem: A): Unit = synchronized { super.+=(elem) }
+  override def push(elem: A): this.type = synchronized[this.type] { super.push(elem) }
 
-  /** Pushes all elements provided by an <code>Iterable</code> object
+  /** Push two or more elements onto the stack. The last element
+   *  of the sequence will be on top of the new stack.
+   *
+   *  @param   elems      the element sequence.
+   *  @return the stack with the new elements on top.
+   */
+  override def push(elem1: A, elem2: A, elems: A*): this.type = synchronized[this.type] { super.push(elem1, elem2, elems: _*) }
+
+  /** Pushes all elements provided by an <code>Traversible</code> object
    *  on top of the stack. The elements are pushed in the order they
    *  are given out by the iterator.
    *
    *  @param  iter        an iterable object
    */
-  override def ++=(iter: Iterable[A]): Unit = synchronized { super.++=(iter) }
+  override def pushAll(elems: collection.Traversible[A]): this.type = synchronized[this.type] { super.pushAll(elems) }
 
   /** Pushes all elements provided by an iterator
    *  on top of the stack. The elements are pushed in the order they
    *  are given out by the iterator.
    *
-   *  @param  iter        an iterator
-   */
-    override def ++=(it: Iterator[A]): Unit = synchronized { super.++=(it) }
-
-  /** Pushes a sequence of elements on top of the stack. The first element
-   *  is pushed first, etc.
-   *
-   *  @param  elems       a sequence of elements
+   *  @param  elems        an iterator
    */
-  override def push(elems: A*): Unit = synchronized { super.++=(elems) }
+  override def pushAll(elems: Iterator[A]): this.type = synchronized[this.type] { super.pushAll(elems) }
 
   /** Returns the top element of the stack. This method will not remove
    *  the element from the stack. An error is signaled if there is no
@@ -90,19 +92,6 @@ class SynchronizedStack[A] extends Stack[A] {
    */
   override def toList: List[A] = synchronized { super.toList }
 
-  /** Checks if two stacks are structurally identical.
-   *
-   *  @return true, iff both stacks contain the same sequence of elements.
-   */
-    override def equals(that: Any): Boolean = synchronized { super.equals(that) }
-
-  /** The hashCode method always yields an error, since it is not
-   *  safe to use mutable stacks as keys in hash tables.
-   *
-   *  @return never.
-   */
-  override def hashCode(): Int = synchronized { super.hashCode() }
-
   /** Returns a textual representation of a stack as a string.
    *
    *  @return the string representation of this stack.
diff --git a/src/library/scala/collection/mutable/Traversible.scala b/src/library/scala/collection/mutable/Traversible.scala
new file mode 100755
index 0000000000..b177c9ca5d
--- /dev/null
+++ b/src/library/scala/collection/mutable/Traversible.scala
@@ -0,0 +1,30 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.mutable
+
+import generic._
+
+/** A subtrait of collection.Traversible which represents traversibles
+ *  that can be mutated.
+ *
+ *  @autor   Martin Odersky
+ *  @version 2.8
+ */
+trait Traversible[A] extends collection.Traversible[A] with TraversibleTemplate[A, Traversible[A]] with Mutable { self =>
+  override protected[this] def newBuilder = Traversible.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Traversible[B], Any] = Traversible.newBuilder[B]
+}
+
+/* A factory object for the trait `Traversible` */
+object Traversible extends TraversibleFactory[Traversible] {
+  type Coll = Traversible[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Traversible[A], Coll] = new BuilderFactory[A, Traversible[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Traversible[A], Any] = new ArrayBuffer
+}
+
+
diff --git a/src/library/scala/collection/mutable/Undoable.scala b/src/library/scala/collection/mutable/Undoable.scala
index 21d23fb887..5e0f4b8e76 100644
--- a/src/library/scala/collection/mutable/Undoable.scala
+++ b/src/library/scala/collection/mutable/Undoable.scala
@@ -1,3 +1,4 @@
+/* TODO: Reintegrate
 /*                     __                                               *\
 **     ________ ___   / /  ___     Scala API                            **
 **    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
@@ -24,3 +25,4 @@ trait Undoable {
      */
     def undo()
 }
+*/
diff --git a/src/library/scala/collection/mutable/Vector.scala b/src/library/scala/collection/mutable/Vector.scala
new file mode 100755
index 0000000000..a253f4b64f
--- /dev/null
+++ b/src/library/scala/collection/mutable/Vector.scala
@@ -0,0 +1,24 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+package scala.collection.mutable
+
+import generic._
+
+/** A subtrait of collection.Vector which represents sequences
+ *  that can be mutated.
+ */
+trait Vector[A] extends Sequence[A] with collection.Vector[A] with MutableVectorTemplate[A, Vector[A]] {
+  override protected[this] def newBuilder = Vector.newBuilder
+  override def traversibleBuilder[B]: Builder[B, Vector[B], Any] = Vector.newBuilder[B]
+}
+
+object Vector extends SequenceFactory[Vector] {
+  type Coll = Vector[_]
+  implicit def builderFactory[A]: BuilderFactory[A, Vector[A], Coll] = new BuilderFactory[A, Vector[A], Coll] { def apply(from: Coll) = from.traversibleBuilder[A] }
+  def newBuilder[A]: Builder[A, Vector[A], Any] = new ArrayBuffer
+}
diff --git a/src/library/scalax/collection/Map.scala b/src/library/scala/collection/mutable/WeakHashMap.scala
index 602da06bb0..7520026e01 100755..100644
--- a/src/library/scalax/collection/Map.scala
+++ b/src/library/scala/collection/mutable/WeakHashMap.scala
@@ -6,16 +6,13 @@
 **                          |/                                          **
 \*                                                                      */
 
-// $Id: Map.scala 16884 2009-01-09 16:52:09Z cunei $
+// $Id: Symbol.scala 17537 2009-04-20 18:37:37Z odersky $
 
 
-package scalax.collection
+package scala.collection.mutable
 
-import generic._
+import JavaConversions._
 
-trait Map[A, B] extends MapTemplate[A, B, Map]
-
-/* Factory object for `Map` class */
-object Map extends MapFactory[Map] {
-  def empty[A, B]: Map[A, B] = new immutable.EmptyMap[A, B]
+class WeakHashMap[A, B] extends JMapWrapper[A, B](new java.util.WeakHashMap) {
+  override def empty = new WeakHashMap[A, B]
 }
diff --git a/src/library/scala/package.scala b/src/library/scala/package.scala
new file mode 100755
index 0000000000..d4130b3920
--- /dev/null
+++ b/src/library/scala/package.scala
@@ -0,0 +1,34 @@
+package object scala {
+  type Iterable[+A] = scala.collection.Iterable[A]
+  val Iterable = scala.collection.Iterable
+
+  /** @deprecated  use Iterable instead */
+  @deprecated type Collection[+A] = Iterable[A]
+  /** @deprecated  use Iterable instead */
+  @deprecated val Collection = Iterable
+
+  type Seq[+A] = scala.collection.Sequence[A]
+  val Seq = scala.collection.Sequence
+
+  type RandomAccessSeq[+A] = scala.collection.Vector[A]
+  val RandomAccessSeq = scala.collection.Vector
+
+  type Iterator[+A] = scala.collection.Iterator[A]
+  val Iterator = scala.collection.Iterator
+
+  type BufferedIterator[+A] = scala.collection.BufferedIterator[A]
+
+  type List[+A] = scala.collection.immutable.List[A]
+  val List = scala.collection.immutable.List
+
+  val Nil = scala.collection.immutable.Nil
+
+  type ::[A] = scala.collection.immutable.::[A]
+  val :: = scala.collection.immutable.::
+
+  type Stream[+A] = scala.collection.immutable.Stream[A]
+  val Stream = scala.collection.immutable.Stream
+
+  type StringBuilder = scala.collection.mutable.StringBuilder
+  val StringBuilder = scala.collection.mutable.StringBuilder
+}
diff --git a/src/library/scalax/runtime/Boxed.scala b/src/library/scala/runtime/Boxed.scala
index 241b12e485..5a43eba80a 100644..100755
--- a/src/library/scalax/runtime/Boxed.scala
+++ b/src/library/scala/runtime/Boxed.scala
@@ -9,7 +9,7 @@
 // $Id: Buffer.scala 15799 2008-08-15 18:23:54Z odersky $
 
 
-package scalax.runtime
+package scala.runtime
 
 trait Boxed {
 
diff --git a/src/library/scala/runtime/BoxedAnyArray.scala b/src/library/scala/runtime/BoxedAnyArray.scala
index b30f2f2d24..42fd4c53bb 100644
--- a/src/library/scala/runtime/BoxedAnyArray.scala
+++ b/src/library/scala/runtime/BoxedAnyArray.scala
@@ -11,8 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
 import compat.Platform
 
 /**
@@ -24,54 +22,8 @@ import compat.Platform
 @serializable
 final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
 
-/*
-  def this(dim1: Int, dim2: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4, dim5))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4, dim5, dim6))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4, dim5, dim6, dim7))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4, dim5, dim6, dim7, dim8))
-  }
-
-  def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int, dim9: Int) = {
-    this(dim1);
-    initializeWith(i => new BoxedAnyArray(dim2, dim3, dim4, dim5, dim6, dim7, dim8, dim9))
-  }
-
-  private def initializeWith(elem: Int => Any) = {
-    for (i <- 0 until length) update(i, elem(i))
-  }
-*/
-
   private var boxed = new Array[AnyRef](length)
-  private val hash = boxed.hashCode()
+//  private val hash = boxed.hashCode()
   private var unboxed: AnyRef = null
   private var elemClass: Class[_] = null
 
@@ -122,17 +74,6 @@ final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
       unboxed.asInstanceOf[Array[AnyRef]](index) = elem
   }
 
-  def unbox(elemTag: String): AnyRef =
-    if (elemTag eq ScalaRunTime.IntTag) unbox(classOf[Int])
-    else if (elemTag eq ScalaRunTime.DoubleTag) unbox(classOf[Double])
-    else if (elemTag eq ScalaRunTime.FloatTag) unbox(classOf[Float])
-    else if (elemTag eq ScalaRunTime.LongTag) unbox(classOf[Long])
-    else if (elemTag eq ScalaRunTime.CharTag) unbox(classOf[Char])
-    else if (elemTag eq ScalaRunTime.ByteTag) unbox(classOf[Byte])
-    else if (elemTag eq ScalaRunTime.ShortTag) unbox(classOf[Short])
-    else if (elemTag eq ScalaRunTime.BooleanTag) unbox(classOf[Boolean])
-    else unbox(Platform.getClassForName(elemTag))
-
   def unbox(elemClass: Class[_]): AnyRef = synchronized {
     if (unboxed eq null) {
       this.elemClass = elemClass;
@@ -201,7 +142,6 @@ final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
         }
         unboxed = newvalue;
       } else if (elemClass == classOf[AnyRef]) {
-        // todo: replace with ScalaRunTime.AnyRef.class
         unboxed = boxed
       } else {
         unboxed = Platform.createArray(elemClass, length)
@@ -222,11 +162,13 @@ final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
     unboxed
   }
 
+/* !!! todo: deal with array equality
   override def equals(other: Any): Boolean =
     other.isInstanceOf[BoxedAnyArray[_]] && (this eq (other.asInstanceOf[BoxedAnyArray[_]])) ||
     (if (unboxed eq null) boxed == other else unboxed == other)
 
   override def hashCode(): Int = hash
+*/
 
   def value: AnyRef = {
     if (unboxed eq null) throw new NotDefinedError("BoxedAnyArray.value")
@@ -246,21 +188,21 @@ final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
         case that: BoxedArray[_] =>
           adapt(that.value)
         case that: Array[Int] =>
-          unbox(ScalaRunTime.IntTag); that
+          unbox(classOf[Int]); that
         case that: Array[Double] =>
-          unbox(ScalaRunTime.DoubleTag); that
+          unbox(classOf[Double]); that
         case that: Array[Float] =>
-          unbox(ScalaRunTime.FloatTag); that
+          unbox(classOf[Float]); that
         case that: Array[Long] =>
-          unbox(ScalaRunTime.LongTag); that
+          unbox(classOf[Long]); that
         case that: Array[Char] =>
-          unbox(ScalaRunTime.CharTag); that
+          unbox(classOf[Char]); that
         case that: Array[Short] =>
-          unbox(ScalaRunTime.ShortTag); that
+          unbox(classOf[Short]); that
         case that: Array[Byte] =>
-          unbox(ScalaRunTime.ByteTag); that
+          unbox(classOf[Byte]); that
         case that: Array[Boolean] =>
-          unbox(ScalaRunTime.BooleanTag); that
+          unbox(classOf[Boolean]); that
         case _ =>
           other
       }
@@ -286,34 +228,12 @@ final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
     Array.copy(if (unboxed ne null) unboxed else boxed, from, dest1, to, len)
   }
 
-  override def subArray(start: Int, end: Int): AnyRef = {
-    val result = new BoxedAnyArray(end - start);
-    Array.copy(this, start, result, 0, end - start)
-    result
-  }
-
   final override def filter(p: A => Boolean): BoxedArray[A] = {
-    val include = new Array[Boolean](length)
-    var len = 0
-    var i = 0
-    while (i < length) {
-      if (p(this(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
+    val (len, include) = countAndMemo(p)
     val result = new BoxedAnyArray[A](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = this(i); len += 1 }
-      i += 1
-    }
-    result
-  }
-  override protected def newArray(length : Int, elements : Iterator[A]) = {
-    val result = new BoxedAnyArray[A](length)
-    var i = 0
-    while (elements.hasNext) {
-      result(i) = elements.next
+    var i, j = 0
+    while (j < len) {
+      if (include(i)) { result(j) = this(i); j += 1 }
       i += 1
     }
     result
diff --git a/src/library/scala/runtime/BoxedArray.scala b/src/library/scala/runtime/BoxedArray.scala
index 630a6874d8..61bf769c2f 100644
--- a/src/library/scala/runtime/BoxedArray.scala
+++ b/src/library/scala/runtime/BoxedArray.scala
@@ -11,9 +11,9 @@
 
 package scala.runtime
 
-
 import Predef._
-import collection.mutable.ArrayBuffer
+import collection.mutable.{Vector, ArrayBuffer}
+import collection.generic._
 
 /**
  *  <p>A class representing <code>Array[T]</code></p>
@@ -21,7 +21,8 @@ import collection.mutable.ArrayBuffer
  *  @author  Martin Odersky, Stephane Micheloud
  *  @version 1.0
  */
-abstract class BoxedArray[A] extends Array.Array0[A] {
+abstract class BoxedArray[A] extends Vector[A] with VectorTemplate[A, BoxedArray[A]] with Boxed {
+
   /** The length of the array */
   def length: Int
 
@@ -31,24 +32,21 @@ abstract class BoxedArray[A] extends Array.Array0[A] {
   /** Update element at given index */
   def update(index: Int, elem: A): Unit
 
+  /** Creates new builder for this collection ==> move to subclasses
+   *
+   * */
+  override protected[this] def newBuilder = traversibleBuilder[A]
+
+  override def traversibleBuilder[B]: Builder[B, BoxedArray[B], Any] = new ArrayBuffer[B].mapResult {
+    _.toArray.asInstanceOf[BoxedArray[B]]
+  }
+
   /** Convert to Java array.
    *  @param elemTag    Either one of the tags ".N" where N is the name of a primitive type
    *                    (@see ScalaRunTime), or a full class name.
    */
-  //todo: remove
-  def unbox(elemTag: String): AnyRef
-
   def unbox(elemClass: Class[_]): AnyRef
 
-  override def isDefinedAt(x: Int): Boolean = 0 <= x && x < length
-
-  @serializable protected class AnyIterator extends Iterator[A] {
-    var index = 0
-    def hasNext: Boolean = index < length
-    def next(): A = { val i = index; index = i + 1; apply(i) }
-  }
-  override def elements = new AnyIterator
-
   /** The underlying array value
    */
   def value: AnyRef
@@ -59,7 +57,14 @@ abstract class BoxedArray[A] extends Array.Array0[A] {
   def copyTo(from: Int, dest: AnyRef, to: Int, len: Int): Unit = {
     Array.copy(value, from, dest, to, len)
   }
+/*
+  override def equals(other: Any) =
+    (value eq other) ||
 
+    other.isInstanceOf[BoxedArray[_]] && (value == other.asInstanceOf[BoxedArray[_]].value)
+
+  override def hashCode(): Int = value.hashCode()
+*/
   /** Fills the given array <code>xs</code> with the elements of
    *  this sequence starting at position <code>start</code>.
    *
@@ -67,62 +72,8 @@ abstract class BoxedArray[A] extends Array.Array0[A] {
    *  @param  start starting index.
    *  @pre    the array must be large enough to hold all elements.
    */
-  override def copyToArray[B](xs: Array[B], start: Int): Unit =
-    copyTo(0, xs, start, length)
-
-  // todo: add a copyToBuffer
-
-  // todo: eliminate
-  def subArray(from: Int, end: Int): AnyRef
-
-  final override def map[b](f: A => b): Array[b] = {
-    val len = length
-    val result = new Array[b](len)
-    var i = 0
-    while (i < len) {
-      result(i) = f(apply(i))
-      i += 1
-    }
-    result
-  }
-
-  final override def flatMap[b](f: A => Iterable[b]): Array[b] = {
-    val buf = new ArrayBuffer[b]
-    val len = length
-    var i = 0
-    while (i < len) {
-      buf ++= f(apply(i))
-      i += 1
-    }
-    buf.toArray
-  }
-
-  final override def ++[b >: A](that: Iterable[b]): Array[b] = super.++(that).toArray
-
-  final def zip[b](that: Array[b]): Array[(A,b)] = {
-    val len = this.length min that.length
-    val result = new Array[(A,b)](len)
-    var i = 0
-    while (i < len) {
-      result(i) = (this(i), that(i))
-      i += 1
-    }
-    result
-  }
-
-  final def zipWithIndex: Array[(A,Int)] = {
-    val len = length
-    val result = new Array[(A,Int)](len)
-    var i = 0
-    while (i < len) {
-      result(i) = (this(i), i)
-      i += 1
-    }
-    result
-  }
-
-  /** Returns an array that contains all indices of this array */
-  def indices: Array[Int] = Array.range(0, length)
+  override def copyToArray[B](xs: Array[B], start: Int, len: Int): Unit =
+    copyTo(0, xs, start, len)
 
   final def deepToString() = deepMkString(stringPrefix + "(", ", ", ")")
 
@@ -173,15 +124,21 @@ abstract class BoxedArray[A] extends Array.Array0[A] {
         false
     }
   }
+
   override final def stringPrefix: String = "Array"
 
-  protected def newArray(length : Int, elements : Iterator[A]) : BoxedArray[A]
-  override def projection : scala.Array.Projection[A] = new scala.Array.Projection[A] {
-    def update(idx : Int, what : A) : Unit = BoxedArray.this.update(idx, what)
-    def length = BoxedArray.this.length
-    def apply(idx : Int) = BoxedArray.this.apply(idx)
-    override def stringPrefix = "ArrayP"
-    protected def newArray[B >: A](length : Int, elements : Iterator[A]) =
-      BoxedArray.this.newArray(length, elements).asInstanceOf[Array[B]]
+  protected def countAndMemo(p: A => Boolean): (Int, Array[Boolean]) = {
+    val len = length
+    val memo = new Array[Boolean](len)
+    var count = 0
+    var i = 0
+    while (i < len) {
+      if (p(this(i))) { memo(i) = true; count += 1 }
+      i += 1
+    }
+    (count, memo)
   }
+
+  /** @deprecated use slice instead */
+  @deprecated def subArray(from: Int, end: Int): BoxedArray[A] = slice(from, end)
 }
diff --git a/src/library/scala/runtime/BoxedBooleanArray.scala b/src/library/scala/runtime/BoxedBooleanArray.scala
index bad611d3bd..6253e12ada 100644
--- a/src/library/scala/runtime/BoxedBooleanArray.scala
+++ b/src/library/scala/runtime/BoxedBooleanArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedBooleanArray(val value: Array[Boolean]) extends BoxedArray[Boolean] {
 
@@ -24,42 +21,5 @@ final class BoxedBooleanArray(val value: Array[Boolean]) extends BoxedArray[Bool
   def update(index: Int, elem: Boolean) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedBooleanArray] && value == other.asInstanceOf[BoxedBooleanArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Boolean] = {
-    val result = new Array[Boolean](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Boolean => Boolean): BoxedArray[Boolean] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Boolean](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedBooleanArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Boolean]) = {
-    val result = new Array[Boolean](length)
-    elements.map(_.asInstanceOf[Boolean]).copyToArray(result, 0)
-    new BoxedBooleanArray(result)
-  }
 }
diff --git a/src/library/scala/runtime/BoxedByteArray.scala b/src/library/scala/runtime/BoxedByteArray.scala
index 0c63acada8..ce3ad42c9e 100644
--- a/src/library/scala/runtime/BoxedByteArray.scala
+++ b/src/library/scala/runtime/BoxedByteArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedByteArray(val value: Array[Byte]) extends BoxedArray[Byte] {
 
@@ -24,44 +21,5 @@ final class BoxedByteArray(val value: Array[Byte]) extends BoxedArray[Byte] {
   def update(index: Int, elem: Byte) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedByteArray] && value == other.asInstanceOf[BoxedByteArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Byte] = {
-    val result = new Array[Byte](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Byte => Boolean): BoxedArray[Byte] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Byte](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedByteArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Byte]) = {
-    val result = new Array[Byte](length)
-    elements.map(_.asInstanceOf[Byte]).copyToArray(result, 0)
-    new BoxedByteArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedCharArray.scala b/src/library/scala/runtime/BoxedCharArray.scala
index 54a90fbee3..519c0fda79 100644
--- a/src/library/scala/runtime/BoxedCharArray.scala
+++ b/src/library/scala/runtime/BoxedCharArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedCharArray(val value: Array[Char]) extends BoxedArray[Char] {
 
@@ -24,44 +21,5 @@ final class BoxedCharArray(val value: Array[Char]) extends BoxedArray[Char] {
   def update(index: Int, elem: Char) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedCharArray] && value == other.asInstanceOf[BoxedCharArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Char] = {
-    val result = new Array[Char](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Char => Boolean): BoxedArray[Char] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Char](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedCharArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Char]) = {
-    val result = new Array[Char](length)
-    elements.map(_.asInstanceOf[Char]).copyToArray(result, 0)
-    new BoxedCharArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedDoubleArray.scala b/src/library/scala/runtime/BoxedDoubleArray.scala
index fdaec061e9..ff6c205f31 100644
--- a/src/library/scala/runtime/BoxedDoubleArray.scala
+++ b/src/library/scala/runtime/BoxedDoubleArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedDoubleArray(val value: Array[Double]) extends BoxedArray[Double] {
 
@@ -24,44 +21,5 @@ final class BoxedDoubleArray(val value: Array[Double]) extends BoxedArray[Double
   def update(index: Int, elem: Double) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedDoubleArray] && value == other.asInstanceOf[BoxedDoubleArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Double] = {
-    val result = new Array[Double](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Double => Boolean): BoxedArray[Double] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Double](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedDoubleArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Double]) = {
-    val result = new Array[Double](length)
-    elements.map(_.asInstanceOf[Double]).copyToArray(result, 0)
-    new BoxedDoubleArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedFloatArray.scala b/src/library/scala/runtime/BoxedFloatArray.scala
index 05b19dd2e9..0d6ec12795 100644
--- a/src/library/scala/runtime/BoxedFloatArray.scala
+++ b/src/library/scala/runtime/BoxedFloatArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedFloatArray(val value: Array[Float]) extends BoxedArray[Float] {
 
@@ -24,44 +21,5 @@ final class BoxedFloatArray(val value: Array[Float]) extends BoxedArray[Float] {
   def update(index: Int, elem: Float) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedFloatArray] && value == other.asInstanceOf[BoxedFloatArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Float] = {
-    val result = new Array[Float](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Float => Boolean): BoxedArray[Float] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Float](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedFloatArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Float]) = {
-    val result = new Array[Float](length)
-    elements.map(_.asInstanceOf[Float]).copyToArray(result, 0)
-    new BoxedFloatArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedIntArray.scala b/src/library/scala/runtime/BoxedIntArray.scala
index 5c062294c3..2b10dd98b1 100644
--- a/src/library/scala/runtime/BoxedIntArray.scala
+++ b/src/library/scala/runtime/BoxedIntArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedIntArray(val value: Array[Int]) extends BoxedArray[Int] {
 
@@ -24,44 +21,5 @@ final class BoxedIntArray(val value: Array[Int]) extends BoxedArray[Int] {
   def update(index: Int, elem: Int) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedIntArray] && value == other.asInstanceOf[BoxedIntArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Int] = {
-    val result = new Array[Int](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Int => Boolean): BoxedArray[Int] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Int](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedIntArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Int]) = {
-    val result = new Array[Int](length)
-    elements.map(_.asInstanceOf[Int]).copyToArray(result, 0)
-    new BoxedIntArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedLongArray.scala b/src/library/scala/runtime/BoxedLongArray.scala
index a94e1e9f04..57bcf19cd2 100644
--- a/src/library/scala/runtime/BoxedLongArray.scala
+++ b/src/library/scala/runtime/BoxedLongArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedLongArray(val value: Array[Long]) extends BoxedArray[Long] {
 
@@ -24,44 +21,5 @@ final class BoxedLongArray(val value: Array[Long]) extends BoxedArray[Long] {
   def update(index: Int, elem: Long) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedLongArray] && value == other.asInstanceOf[BoxedLongArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Long] = {
-    val result = new Array[Long](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Long => Boolean): BoxedArray[Long] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Long](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedLongArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Long]) = {
-    val result = new Array[Long](length)
-    elements.map(_.asInstanceOf[Long]).copyToArray(result, 0)
-    new BoxedLongArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/BoxedObjectArray.scala b/src/library/scala/runtime/BoxedObjectArray.scala
index f1f845d37f..c46e54fd81 100644
--- a/src/library/scala/runtime/BoxedObjectArray.scala
+++ b/src/library/scala/runtime/BoxedObjectArray.scala
@@ -29,22 +29,18 @@ final class BoxedObjectArray[A <: AnyRef](val value: Array[AnyRef]) extends Boxe
   def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
 
+/*
   override def equals(other: Any): Boolean =
     (value eq other.asInstanceOf[AnyRef]) ||
     other.isInstanceOf[BoxedObjectArray[_]] && (value eq other.asInstanceOf[BoxedObjectArray[_]].value)
 
   override def hashCode(): Int = (value.asInstanceOf[AnyRef]).hashCode()
+*/
 
   private def create(length: Int): Array[AnyRef] = {
     createArray(value.getClass().getComponentType(), length).asInstanceOf[Array[AnyRef]]
   }
 
-  override def subArray(start: Int, end: Int): Array[AnyRef] = {
-    val result = create(end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
   final override def filter(p: A => Boolean): BoxedArray[A] = {
     val include = new Array[Boolean](value.length)
     var len = 0
@@ -62,11 +58,5 @@ final class BoxedObjectArray[A <: AnyRef](val value: Array[AnyRef]) extends Boxe
     }
     new BoxedObjectArray[A](result)
   }
-
-  override protected def newArray(length: Int, elements: Iterator[A]) = {
-    val result = create(length)
-    elements.map(_.asInstanceOf[A]).copyToArray(result, 0)
-    new BoxedObjectArray[A](result)
-  }
 }
 
diff --git a/src/library/scala/runtime/BoxedShortArray.scala b/src/library/scala/runtime/BoxedShortArray.scala
index 30a879d26d..b99cc80610 100644
--- a/src/library/scala/runtime/BoxedShortArray.scala
+++ b/src/library/scala/runtime/BoxedShortArray.scala
@@ -11,9 +11,6 @@
 
 package scala.runtime
 
-
-import Predef._
-
 @serializable
 final class BoxedShortArray(val value: Array[Short]) extends BoxedArray[Short] {
 
@@ -24,44 +21,5 @@ final class BoxedShortArray(val value: Array[Short]) extends BoxedArray[Short] {
   def update(index: Int, elem: Short) {
     value(index) = elem
   }
-
-  def unbox(elemTag: String): AnyRef = value
   def unbox(elemClass: Class[_]): AnyRef = value
-
-  override def equals(other: Any) =
-    value == other ||
-    other.isInstanceOf[BoxedShortArray] && value == other.asInstanceOf[BoxedShortArray].value
-
-  override def hashCode(): Int = value.hashCode()
-
-  def subArray(start: Int, end: Int): Array[Short] = {
-    val result = new Array[Short](end - start)
-    Array.copy(value, start, result, 0, end - start)
-    result
-  }
-
-  final override def filter(p: Short => Boolean): BoxedArray[Short] = {
-    val include = new Array[Boolean](value.length)
-    var len = 0
-    var i = 0
-    while (i < value.length) {
-      if (p(value(i))) { include(i) = true; len += 1 }
-      i += 1
-    }
-    val result = new Array[Short](len)
-    len = 0
-    i = 0
-    while (len < result.length) {
-      if (include(i)) { result(len) = value(i); len += 1 }
-      i += 1
-    }
-    new BoxedShortArray(result)
-  }
-  override protected def newArray(length : Int, elements : Iterator[Short]) = {
-    val result = new Array[Short](length)
-    elements.map(_.asInstanceOf[Short]).copyToArray(result, 0)
-    new BoxedShortArray(result)
-  }
-
-
 }
diff --git a/src/library/scala/runtime/RichChar.scala b/src/library/scala/runtime/RichChar.scala
index cd4d979c5e..943e5516f5 100644
--- a/src/library/scala/runtime/RichChar.scala
+++ b/src/library/scala/runtime/RichChar.scala
@@ -11,9 +11,10 @@
 
 package scala.runtime
 
-
 import java.lang.Character
-import Predef.NoSuchElementException
+import collection.Vector
+import collection.generic.VectorView
+import Predef.{require, NoSuchElementException}
 
 /** <p>
  *    For example, in the following code
@@ -52,24 +53,22 @@ final class RichChar(x: Char) extends Proxy with Ordered[Char] {
   def toLowerCase: Char = Character.toLowerCase(x)
   def toUpperCase: Char = Character.toUpperCase(x)
 
-  /** Create a <code>RandomAccessSeq.Projection[Char]</code> over the characters from 'x' to 'y' - 1
+  /** Create a <code>[Char]</code> over the characters from 'x' to 'y' - 1
    */
-  def until(limit: Char): RandomAccessSeq.Projection[Char] =
-    if (limit <= x) RandomAccessSeq.empty.projection
+  def until(limit: Char): VectorView[Char, Vector[Char]] =
+    if (limit <= x) Vector.empty.view
     else
-      new RandomAccessSeq.Projection[Char] {
+      new VectorView[Char, Vector[Char]] {
+        protected def underlying = Vector.empty[Char]
         def length = limit - x
         def apply(i: Int): Char = {
-          Predef.require(i >= 0 && i < length)
+          require(i >= 0 && i < length)
           (x + i).toChar
         }
-        override def stringPrefix = "RandomAccessSeq.Projection"
       }
 
-  //def until(y: Char): Iterator[Char] = to(y)
-
   /** Create a <code>RandomAccessSeq.Projection[Char]</code> over the characters from 'x' to 'y'
    */
-  def to(y: Char): RandomAccessSeq.Projection[Char] = until((y + 1).toChar)
+  def to(y: Char): VectorView[Char, Vector[Char]] = until((y + 1).toChar)
 
 }
diff --git a/src/library/scala/runtime/RichInt.scala b/src/library/scala/runtime/RichInt.scala
index 8da0a4076f..c62d8fcd06 100644
--- a/src/library/scala/runtime/RichInt.scala
+++ b/src/library/scala/runtime/RichInt.scala
@@ -27,7 +27,7 @@ final class RichInt(start: Int) extends Proxy with Ordered[Int] {
   def until(end: Int, step: Int): Range = new Range(start, end, step)
 
   /** like <code>until</code>, but includes the last index */
-  def to(end: Int) = new Range.Inclusive(start, end, 1)
+  def to(end: Int) = Range.inclusive(start, end, 1)
 
   def min(that: Int): Int = if (start < that) start else that
   def max(that: Int): Int = if (start > that) start else that
diff --git a/src/library/scala/runtime/RichString.scala b/src/library/scala/runtime/RichString.scala
index 0fb6ee403e..44bf12a4dd 100644
--- a/src/library/scala/runtime/RichString.scala
+++ b/src/library/scala/runtime/RichString.scala
@@ -11,68 +11,41 @@
 
 package scala.runtime
 
-import Predef._
 import scala.util.matching.Regex
+import collection.generic._
+//import collection.mutable.StringBuilder
+import collection.immutable.Vector
 
-final class RichString(val self: String) extends Proxy with RandomAccessSeq[Char] with Ordered[String] {
-  import RichString._
-  override def apply(n: Int) = self charAt n
-  override def length = self.length
-  override def toString = self
-  override def mkString = self
-
-  override def slice(from: Int, until: Int): RichString = {
-    val len = self.length
-    new RichString(
-      if (from >= until || from >= len)
-        ""
-      else {
-        val from0 = if (from < 0) 0 else from
-        val until0 = if (until > len) len else until
-        self.substring(from0, until0)
-      }
-    )
-  }
+object RichString {
 
-  //override def ++ [B >: A](that: Iterable[B]): Seq[B] = {
-  override def ++[B >: Char](that: Iterable[B]): RandomAccessSeq[B] = that match {
-    case that: RichString => new RichString(self + that.self)
-    case that => super.++(that)
-  }
+//  def newBuilder: Builder[Char, String, Any] = new StringBuilder()
+  def newBuilder: Builder[Char, RichString, Any] = new StringBuilder() mapResult (new RichString(_))
+  implicit def builderFactory: BuilderFactory[Char, RichString, RichString] = new BuilderFactory[Char, RichString, RichString] { def apply(from: RichString) = newBuilder }
+  implicit def builderFactory2: BuilderFactory[Char, RichString, String] = new BuilderFactory[Char, RichString, String] { def apply(from: String) = newBuilder }
 
-  override def take(until: Int): RichString = slice(0, until)
+  // just statics for rich string.
+  private final val LF: Char = 0x0A
+  private final val FF: Char = 0x0C
+  private final val CR: Char = 0x0D
+  private final val SU: Char = 0x1A
+}
 
-  override def drop(from: Int): RichString = slice(from, self.length)
+import RichString._
 
-  override def startsWith[B](that: Seq[B]) = that match {
-    case that: RichString => self startsWith that.self
-    case that => super.startsWith(that)
-  }
+class RichString(val self: String) extends Proxy with Vector[Char] with VectorTemplate[Char, RichString] with PartialFunction[Int, Char] with Ordered[String] {
 
-  override def endsWith[B](that: Seq[B]) = that match {
-    case that: RichString => self endsWith that.self
-    case that => super.endsWith(that)
-  }
+  /** Creates a string builder buffer as builder for this class */
+  override protected[this] def newBuilder = RichString.newBuilder
 
-  override def indexOf[B](that: Seq[B]) = that match {
-    case that: RichString => self indexOf that.self
-    case that => super.indexOf(that)
-  }
+  /** Return element at index `n`
+   *  @throws   IndexOutofBoundsException if the index is not valid
+   */
+  def apply(n: Int): Char = self charAt n
 
-  override def containsSlice[B](that: Seq[B]) = that match {
-    case that: RichString => self contains that.self
-    case that => super.containsSlice(that)
-  }
+  def length: Int = self.length
 
-  override def reverse: RichString = {
-    val buf = new StringBuilder
-    var i = self.length - 1
-    while (i >= 0) {
-      buf append (self charAt i)
-      i -= 1
-    }
-    new RichString(buf.toString)
-  }
+  override def mkString = self
+  override def toString = self
 
   /** return n times the current string
    */
@@ -211,6 +184,15 @@ final class RichString(val self: String) extends Proxy with RandomAccessSeq[Char
   def toFloat: Float     = java.lang.Float.parseFloat(self)
   def toDouble: Double   = java.lang.Double.parseDouble(self)
 
+  private def parseBoolean(s: String): Boolean =
+    if (s != null) s.toLowerCase match {
+      case "true" => true
+      case "false" => false
+      case _ => throw new NumberFormatException("For input string: \""+s+"\"")
+    }
+    else
+      throw new NumberFormatException("For input string: \"null\"")
+
   def toArray: Array[Char] = {
     val result = new Array[Char](length)
     self.getChars(0, length, result, 0)
@@ -236,19 +218,3 @@ final class RichString(val self: String) extends Proxy with RandomAccessSeq[Char
     java.lang.String.format(self, args.toList.toArray[Any].asInstanceOf[Array[AnyRef]]: _*)
 }
 
-object RichString {
-  // just statics for rich string.
-  private final val LF: Char = 0x0A
-  private final val FF: Char = 0x0C
-  private final val CR: Char = 0x0D
-  private final val SU: Char = 0x1A
-
-  private def parseBoolean(s: String): Boolean =
-    if (s != null) s.toLowerCase match {
-      case "true" => true
-      case "false" => false
-      case _ => throw new NumberFormatException("For input string: \""+s+"\"")
-    }
-    else
-      throw new NumberFormatException("For input string: \"null\"")
-}
diff --git a/src/library/scala/runtime/RichStringBuilder.scala b/src/library/scala/runtime/RichStringBuilder.scala
deleted file mode 100644
index 51a3a00369..0000000000
--- a/src/library/scala/runtime/RichStringBuilder.scala
+++ /dev/null
@@ -1,57 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id$
-
-
-package scala.runtime
-
-
-import Predef._
-import scala.collection.mutable.{Buffer,ArrayBuffer}
-
-final class RichStringBuilder(val self : StringBuilder) extends RandomAccessSeq.Mutable[Char] with Proxy with Buffer[Char] {
-  override def length = self.length
-  override def apply(idx : Int) = self.charAt(idx)
-  override def mkString = self.toString
-  override def update(idx : Int, c : Char) = self.setCharAt(idx, c)
-  override def +=(c: Char): Unit = self append c
-  override def ++=(iter: Iterable[Char]): Unit = iter match {
-  case str : RichString => self append str.self
-  case str : Array[Char] => self append str
-  case iter => super.++=(iter)
-  }
-  override def ++(iter: Iterable[Char]): RichStringBuilder = { this ++= iter; this }
-  override def ++[B >: Char](that : Iterable[B]) : RandomAccessSeq[B] = {
-    val buf = new ArrayBuffer[B]
-    this copyToBuffer buf
-    that copyToBuffer buf
-    buf
-  }
-
-
-  override def insertAll(idx: Int, iter: Iterable[Char]): Unit = iter match {
-  case str : RichString => self.insert(idx, str)
-  case str : Array[Char] => self.insert(idx, str)
-  case iter =>
-    val i = iter.elements
-    var jdx = idx
-    while (i.hasNext) {
-      self.insert(jdx, i.next)
-      jdx = jdx + 1
-    }
-  }
-  override def +:(c : Char) = self.insert(0, c)
-  def ensureSize(size : Int) = self.ensureCapacity(size)
-  override def remove(idx : Int) = {
-    val c = self.charAt(idx)
-    self.deleteCharAt(idx)
-    c
-  }
-  override def clear = self.setLength(0)
-}
diff --git a/src/library/scala/runtime/ScalaRunTime.scala b/src/library/scala/runtime/ScalaRunTime.scala
index 84f1945177..8f1acb8381 100644
--- a/src/library/scala/runtime/ScalaRunTime.scala
+++ b/src/library/scala/runtime/ScalaRunTime.scala
@@ -11,25 +11,11 @@
 
 package scala.runtime
 
-
-import Predef._
-
 /* The object <code>ScalaRunTime</code> provides ...
  */
 object ScalaRunTime {
 
-  /** Names for primitive types, used by array unboxing */
-  val ByteTag = ".Byte"
-  val ShortTag = ".Short"
-  val CharTag = ".Char"
-  val IntTag = ".Int"
-  val LongTag = ".Long"
-  val FloatTag = ".Float"
-  val DoubleTag = ".Double"
-  val BooleanTag = ".Boolean"
-
   def isArray(x: AnyRef): Boolean = (x != null && x.getClass.isArray) || (x != null && x.isInstanceOf[BoxedArray[_]])
-  def isValueTag(tag: String) = tag.charAt(0) == '.'
   def isValueClass(clazz: Class[_]) = clazz.isPrimitive()
 
   def forceBoxedArray[A <: Any](xs: Seq[A]): Array[A] = {
@@ -127,9 +113,6 @@ object ScalaRunTime {
 
   def Seq[a](xs: a*): Seq[a] = null // interpreted specially by new backend.
 
-  def arrayValue[A](x: BoxedArray[A], elemTag: String): AnyRef =
-    if (x eq null) null else x.unbox(elemTag)
-
   def arrayValue[A](x: BoxedArray[A], elemClass: Class[_]): AnyRef =
     if (x eq null) null else x.unbox(elemClass)
 
diff --git a/src/library/scala/util/automata/BaseBerrySethi.scala b/src/library/scala/util/automata/BaseBerrySethi.scala
index fbe23be42a..d35e84fd83 100644
--- a/src/library/scala/util/automata/BaseBerrySethi.scala
+++ b/src/library/scala/util/automata/BaseBerrySethi.scala
@@ -35,11 +35,11 @@ abstract class BaseBerrySethi {
 
   protected var finalTag: Int = _
 
-  protected var finals: immutable.TreeMap[Int, Int] = _     // final states
+  protected var finals: immutable.Map[Int, Int] = _     // final states
 
   // constants --------------------------
 
-  final val emptySet:immutable.Set[Int] = new immutable.TreeSet[Int]()
+  final val emptySet:immutable.Set[Int] = immutable.Set[Int]()
 
   /** computes first( r ) for the word regexp r */
   protected def compFirst(r: RegExp): immutable.Set[Int] = r match {
diff --git a/src/library/scala/util/automata/DetWordAutom.scala b/src/library/scala/util/automata/DetWordAutom.scala
index b8e18139be..0f812b2270 100644
--- a/src/library/scala/util/automata/DetWordAutom.scala
+++ b/src/library/scala/util/automata/DetWordAutom.scala
@@ -59,10 +59,10 @@ abstract class DetWordAutom[T <: AnyRef] {
     val sb = new StringBuilder("[DetWordAutom  nstates=")
     sb.append(nstates)
     sb.append(" finals=")
-    var map = new scala.collection.immutable.ListMap[Int,Int]
+    var map = scala.collection.immutable.Map[Int,Int]()
     var j = 0; while( j < nstates ) {
       if (j < finals.length)
-        map = map.update(j, finals(j))
+        map = map.add(j, finals(j))
       j += 1
     }
     sb.append(map.toString())
diff --git a/src/library/scala/util/automata/NondetWordAutom.scala b/src/library/scala/util/automata/NondetWordAutom.scala
index 461570fcdd..89686c47d4 100644
--- a/src/library/scala/util/automata/NondetWordAutom.scala
+++ b/src/library/scala/util/automata/NondetWordAutom.scala
@@ -89,10 +89,10 @@ abstract class NondetWordAutom[T <: AnyRef] {
     val sb = new StringBuilder("[NondetWordAutom  nstates=")
     sb.append(nstates)
     sb.append("  finals=")
-    var map = new scala.collection.immutable.ListMap[Int,Int]
+    var map = scala.collection.immutable.Map[Int,Int]()
     var j = 0; while (j < nstates) {
       if (isFinal(j))
-        map = map.update(j, finals(j));
+        map = map.add(j, finals(j));
       j += 1
     }
     sb.append(map.toString)
diff --git a/src/library/scala/util/automata/SubsetConstruction.scala b/src/library/scala/util/automata/SubsetConstruction.scala
index 16f9b91ac9..3d8cb34f29 100644
--- a/src/library/scala/util/automata/SubsetConstruction.scala
+++ b/src/library/scala/util/automata/SubsetConstruction.scala
@@ -15,7 +15,7 @@ package scala.util.automata
 class SubsetConstruction[T <: AnyRef](val nfa: NondetWordAutom[T]) {
   import nfa.labels
   import scala.collection.{immutable, mutable, Map}
-  import immutable.{BitSet, TreeMap, TreeSet}
+  import immutable.BitSet
 
   implicit def toOrdered(bs: BitSet): Ordered[BitSet] = new Ordered[BitSet] {
     def compare(that: BitSet): Int = {
@@ -77,16 +77,16 @@ class SubsetConstruction[T <: AnyRef](val nfa: NondetWordAutom[T]) {
   def determinize: DetWordAutom[T] = {
 
     // for assigning numbers to bitsets
-    var indexMap    = new TreeMap[BitSet, Int]
-    var invIndexMap = new TreeMap[Int, BitSet]
+    var indexMap    = Map[BitSet, Int]()
+    var invIndexMap = Map[Int, BitSet]()
     var ix = 0
 
     // we compute the dfa with states = bitsets
-    var states   = new TreeSet[BitSet]()
+    var states   = Set[BitSet]()
     val delta    = new mutable.HashMap[BitSet,
                                        mutable.HashMap[T, BitSet]]
-    var deftrans = new TreeMap[BitSet, BitSet]
-    var finals   = new TreeMap[BitSet, Int]
+    var deftrans = Map[BitSet, BitSet]()
+    var finals   = Map[BitSet, Int]()
 
     val q0 = _initialBitSet
     states = states + q0
@@ -94,17 +94,17 @@ class SubsetConstruction[T <: AnyRef](val nfa: NondetWordAutom[T]) {
     val sink = _emptyBitSet
     states = states + sink
 
-    deftrans = deftrans.update(q0,sink);
-    deftrans = deftrans.update(sink,sink);
+    deftrans = deftrans.add(q0,sink);
+    deftrans = deftrans.add(sink,sink);
 
-    val rest = new mutable.Stack[BitSet]();
+    val rest = new mutable.ArrayStack[BitSet]();
 
     def add(Q: BitSet) {
       if (!states.contains(Q)) {
         states = states + Q
         rest.push(Q)
         if (nfa.containsFinal(Q))
-          finals = finals.update(Q, selectTag(Q,nfa.finals));
+          finals = finals.add(Q, selectTag(Q,nfa.finals));
       }
     }
     rest.push(sink)
@@ -113,24 +113,24 @@ class SubsetConstruction[T <: AnyRef](val nfa: NondetWordAutom[T]) {
     while (!rest.isEmpty) {
       // assign a number to this bitset
       val P = rest.pop
-      indexMap = indexMap.update(P,ix)
-      invIndexMap = invIndexMap.update(ix,P)
+      indexMap = indexMap.add(P,ix)
+      invIndexMap = invIndexMap.add(ix,P)
       ix += 1
 
       // make transitiion map
       val Pdelta = new mutable.HashMap[T, BitSet]
-      delta.update(P, Pdelta)
+      delta.add(P, Pdelta)
 
       val it = labels.elements; while(it.hasNext) {
         val label = it.next
         val Q = nfa.next(P,label)
-	Pdelta.update(label, Q)
+	Pdelta.add(label, Q)
         add(Q)
       }
 
       // collect default transitions
       val Pdef = nfa.nextDefault(P)
-      deftrans = deftrans.update(P, Pdef)
+      deftrans = deftrans.add(P, Pdef)
       add(Pdef)
     };
 
@@ -151,10 +151,10 @@ class SubsetConstruction[T <: AnyRef](val nfa: NondetWordAutom[T]) {
         val label = it.next
         val p = indexMap(trans(label))
         if (p != qDef)
-          ntrans.update(label, p)
+          ntrans.add(label, p)
       }
-      deltaR.update(q, ntrans)
-      defaultR.update(q, qDef)
+      deltaR(q) = ntrans
+      defaultR(q) = qDef
 
       //cleanup? leave to garbage collector?
       //delta.remove(Q);
diff --git a/src/library/scala/util/automata/WordBerrySethi.scala b/src/library/scala/util/automata/WordBerrySethi.scala
index 3157ea560b..72b065f3e1 100644
--- a/src/library/scala/util/automata/WordBerrySethi.scala
+++ b/src/library/scala/util/automata/WordBerrySethi.scala
@@ -33,7 +33,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
 
   protected var labels:mutable.HashSet[_labelT] = _
   // don't let this fool you, only labelAt is a real, surjective mapping
-  protected var labelAt: immutable.TreeMap[Int, _labelT] = _ // new alphabet "gamma"
+  protected var labelAt: immutable.Map[Int, _labelT] = _ // new alphabet "gamma"
 
   protected var deltaq: Array[mutable.HashMap[_labelT,List[Int]]] = _ // delta
 
@@ -80,7 +80,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
       case x:Letter =>
         //val i = posMap(x)
         val i = x.pos
-        this.follow.update(i, fol1)
+        this.follow.add(i, fol1)
         emptySet + i
       case Eps =>
         emptySet /*ignore*/
@@ -96,8 +96,8 @@ abstract class WordBerrySethi extends BaseBerrySethi {
   /** called at the leaves of the regexp */
   protected def seenLabel(r: RegExp, i: Int, label: _labelT) {
     //Console.println("seenLabel (1)");
-    //this.posMap.update(r, i)
-    this.labelAt = this.labelAt.update(i, label)
+    //this.posMap.add(r, i)
+    this.labelAt = this.labelAt.add(i, label)
     //@ifdef if( label != Wildcard ) {
       this.labels += label
     //@ifdef }
@@ -121,10 +121,10 @@ abstract class WordBerrySethi extends BaseBerrySethi {
 
   protected def makeTransition(src: Int, dest: Int, label: _labelT ) {
     //@ifdef compiler if( label == Wildcard )
-    //@ifdef compiler   defaultq.update(src, dest::defaultq( src ))
+    //@ifdef compiler   defaultq.add(src, dest::defaultq( src ))
     //@ifdef compiler else
     val q = deltaq(src)
-    q.update(label, dest::(q.get(label) match {
+    q.add(label, dest::(q.get(label) match {
       case Some(x) => x
       case _       => Nil
     }))
@@ -132,7 +132,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
 
   protected def initialize(subexpr: Seq[RegExp]): Unit = {
     //this.posMap = new mutable.HashMap[RegExp,Int]()
-    this.labelAt = new immutable.TreeMap[Int, _labelT]()
+    this.labelAt = immutable.Map[Int, _labelT]()
     this.follow = new mutable.HashMap[Int, immutable.Set[Int]]()
     this.labels = new mutable.HashSet[_labelT]()
 
@@ -149,7 +149,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
   }
 
   protected def initializeAutom() {
-    finals   = immutable.TreeMap.empty[Int, Int] // final states
+    finals   = immutable.Map.empty[Int, Int] // final states
     deltaq   = new Array[mutable.HashMap[_labelT, List[Int]]](pos) // delta
     defaultq = new Array[List[Int]](pos) // default transitions
 
@@ -171,7 +171,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
       while (it.hasNext) {
         val k = it.next
         if (pos == k)
-          finals = finals.update(j, finalTag)
+          finals = finals.add(j, finalTag)
         else
           makeTransition( j, k, labelAt(k))
       }
@@ -195,14 +195,14 @@ abstract class WordBerrySethi extends BaseBerrySethi {
         collectTransitions()
 
         if (x.isNullable) // initial state is final
-          finals = finals.update(0, finalTag)
+          finals = finals.add(0, finalTag)
 
-        var delta1: immutable.TreeMap[Int, Map[_labelT, List[Int]]] =
-          new immutable.TreeMap[Int, Map[_labelT, List[Int]]]
+        var delta1: immutable.Map[Int, Map[_labelT, List[Int]]] =
+          immutable.Map[Int, Map[_labelT, List[Int]]]()
 
         var i = 0
         while (i < deltaq.length) {
-          delta1 = delta1.update(i, deltaq(i))
+          delta1 = delta1.add(i, deltaq(i))
           i += 1
         }
         val finalsArr = new Array[Int](pos)
@@ -239,7 +239,7 @@ abstract class WordBerrySethi extends BaseBerrySethi {
               val x = new mutable.BitSet(pos)
               for (q <- trans(lab))
                 x += q
-              hmap.update(lab, x.toImmutable)
+              hmap.add(lab, x.toImmutable)
             }
             deltaArr(k) = hmap
             k += 1
diff --git a/src/library/scalax/util/control/Breaks.scala b/src/library/scala/util/control/Breaks.scala
index e89a03f76b..b3eaad23ae 100755
--- a/src/library/scalax/util/control/Breaks.scala
+++ b/src/library/scala/util/control/Breaks.scala
@@ -1,4 +1,4 @@
-package scalax.util.control
+package scala.util.control
 
 object Breaks {
   private class BreakException extends RuntimeException
diff --git a/src/library/scalax/util/control/TailRec.scala b/src/library/scala/util/control/TailRec.scala
index db6cbfa2ed..db6cbfa2ed 100644..100755
--- a/src/library/scalax/util/control/TailRec.scala
+++ b/src/library/scala/util/control/TailRec.scala
diff --git a/src/library/scala/util/matching/Regex.scala b/src/library/scala/util/matching/Regex.scala
index ba770c868b..67d37083e8 100644
--- a/src/library/scala/util/matching/Regex.scala
+++ b/src/library/scala/util/matching/Regex.scala
@@ -194,7 +194,7 @@ object Regex {
       if (end(i) >= 0) source.subSequence(end(i), source.length)
       else null
 
-    private lazy val nameToIndex: Map[String, Int] = Map() ++ ("" :: groupNames.toList).zipWithIndex
+    private lazy val nameToIndex: Map[String, Int] = Map[String, Int]() ++ ("" :: groupNames.toList).zipWithIndex
 
     /** Returns the group with given name
      *
diff --git a/src/library/scala/util/parsing/ast/Binders.scala b/src/library/scala/util/parsing/ast/Binders.scala
index 3bca5ba5e4..75ce3b28d0 100644
--- a/src/library/scala/util/parsing/ast/Binders.scala
+++ b/src/library/scala/util/parsing/ast/Binders.scala
@@ -92,7 +92,7 @@ trait Binders extends AbstractSyntax with Mappable {
    */
   class Scope[binderType <: NameElement] extends Iterable[binderType]{
     private val substitution: Map[binderType, Element] =
-      new scala.collection.jcl.LinkedHashMap[binderType, Element] // a LinkedHashMap is ordered by insertion order -- important!
+      new scala.collection.mutable.LinkedHashMap[binderType, Element] // a LinkedHashMap is ordered by insertion order -- important!
 
     /** Returns a unique number identifying this Scope (only used for representation purposes).
      */
diff --git a/src/library/scala/xml/Attribute.scala b/src/library/scala/xml/Attribute.scala
index 261e9d9c86..261e9d9c86 100644..100755
--- a/src/library/scala/xml/Attribute.scala
+++ b/src/library/scala/xml/Attribute.scala
diff --git a/src/library/scala/xml/MetaData.scala b/src/library/scala/xml/MetaData.scala
index bca5fe08a1..d947e40ee3 100644
--- a/src/library/scala/xml/MetaData.scala
+++ b/src/library/scala/xml/MetaData.scala
@@ -81,7 +81,7 @@ object MetaData {
  * @author Burak Emir <bqe@google.com>
  */
 @serializable
-abstract class MetaData extends Collection[MetaData] {
+abstract class MetaData extends Iterable[MetaData] {
 
   /** updates this MetaData with the MetaData given as argument. All attributes that occur in updates
    *  are part of the resulting MetaData. If an unprefixed attribute occurs in both this instance and
@@ -181,7 +181,7 @@ abstract class MetaData extends Collection[MetaData] {
       y
     }
   }
-  def size : Int = 1 + {
+  override def size : Int = 1 + {
     if (Null == next) 0 else next.size
   }
 
diff --git a/src/library/scala/xml/NodeSeq.scala b/src/library/scala/xml/NodeSeq.scala
index 1316c51578..c6d6625be3 100644
--- a/src/library/scala/xml/NodeSeq.scala
+++ b/src/library/scala/xml/NodeSeq.scala
@@ -11,6 +11,9 @@
 
 package scala.xml
 
+import collection.immutable
+import collection.generic._
+import collection.mutable.ListBuffer
 
 /** This object ...
  *
@@ -22,7 +25,10 @@ object NodeSeq {
   def fromSeq(s: Seq[Node]): NodeSeq = new NodeSeq {
     def theSeq = s
   }
-  implicit def view(s: Seq[Node]): NodeSeq = fromSeq(s)
+  type Coll = NodeSeq
+  implicit def builderFactory: BuilderFactory[Node, NodeSeq, Coll] = new BuilderFactory[Node, NodeSeq, Coll] { def apply(from: Coll) = newBuilder }
+  def newBuilder: Builder[Node, NodeSeq, Any] = new ListBuffer[Node] mapResult fromSeq
+  implicit def seqToNodeSeq(s: Seq[Node]): NodeSeq = fromSeq(s)
 }
 
 /** This class implements a wrapper around <code>Seq[Node]</code> that
@@ -31,8 +37,12 @@ object NodeSeq {
  *  @author  Burak Emir
  *  @version 1.0
  */
-abstract class NodeSeq extends Seq[Node] {
-  import NodeSeq.view // import view magic for NodeSeq wrappers
+abstract class NodeSeq extends immutable.Sequence[Node] with SequenceTemplate[Node, NodeSeq] {
+  import NodeSeq.seqToNodeSeq // import view magic for NodeSeq wrappers
+
+  /** Creates a list buffer as builder for this class */
+  override protected[this] def newBuilder = NodeSeq.newBuilder
+
   def theSeq: Seq[Node]
   def length = theSeq.length
   override def elements = theSeq.elements
diff --git a/src/library/scala/xml/parsing/XhtmlEntities.scala b/src/library/scala/xml/parsing/XhtmlEntities.scala
index cdfe274ed4..0b12a47162 100644
--- a/src/library/scala/xml/parsing/XhtmlEntities.scala
+++ b/src/library/scala/xml/parsing/XhtmlEntities.scala
@@ -34,7 +34,7 @@ object XhtmlEntities {
       ("xi",958), ("omicron",959), ("pi",960), ("rho",961), ("sigmaf",962), ("sigma",963), ("tau",964), ("upsilon",965), ("phi",966), ("chi",967),
       ("psi",968), ("omega",969), ("thetasym",977), ("upsih",978), ("piv",982))
 
-  val entMap: Map[String, Char] = Map.empty ++ entList.map { case (name, value) => (name, value.toChar)}
+  val entMap: Map[String, Char] = Map.empty[String, Char] ++ entList.map { case (name, value) => (name, value.toChar)}
 
   val entities = entList.
         map { case (name, value) => (name, new ParsedEntityDecl(name, new IntDef(value.toChar.toString)))}
diff --git a/src/library/scalax/Tuple2.scala b/src/library/scalax/Tuple2.scala
deleted file mode 100755
index 4adb9e471b..0000000000
--- a/src/library/scalax/Tuple2.scala
+++ /dev/null
@@ -1,97 +0,0 @@
-
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2008, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Tuple2.scala 14794 2008-04-23 08:15:17Z washburn $
-
-// generated by genprod on Wed Apr 23 10:06:16 CEST 2008  (with extra methods)
-
-package scalax
-
-import annotation.unchecked.uncheckedVariance
-
-object Tuple2 {
-
-  import collection._
-  import collection.generic._
-
-  class IterableOps[CC[+B] <: Iterable[B] with IterableTemplate[CC, B @uncheckedVariance], A1, A2](tuple: (CC[A1], Iterable[A2])) {
-    def zip: CC[(A1, A2)] = {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      val b = tuple._1.newBuilder[(A1, A2)]
-      while (elems1.hasNext && elems2.hasNext)
-        b += ((elems1.next, elems2.next))
-      b.result
-    }
-    def map[B](f: (A1, A2) => B): CC[B] = {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      val b = tuple._1.newBuilder[B]
-      while (elems1.hasNext && elems2.hasNext)
-        b += f(elems1.next, elems2.next)
-      b.result
-    }
-    def flatMap[B](f: (A1, A2) => CC[B]): CC[B] = {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      val b = tuple._1.newBuilder[B]
-      while (elems1.hasNext && elems2.hasNext)
-        b ++= f(elems1.next, elems2.next)
-      b.result
-    }
-    def foreach(f: (A1, A2) => Unit) {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      while (elems1.hasNext && elems2.hasNext)
-        f(elems1.next, elems2.next)
-    }
-    def forall(p: (A1, A2) => Boolean): Boolean = {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      while (elems1.hasNext && elems2.hasNext)
-        if (!p(elems1.next, elems2.next)) return false
-      true
-    }
-    def exists(p: (A1, A2) => Boolean): Boolean = {
-      val elems1 = tuple._1.elements
-      val elems2 = tuple._2.elements
-      while (elems1.hasNext && elems2.hasNext)
-        if (p(elems1.next, elems2.next)) return true
-      false
-    }
-  }
-  implicit def tupleOfIterableWrapper[CC[+B] <: Iterable[B] with IterableTemplate[CC, B], A1, A2](tuple: (CC[A1], Iterable[A2])) =
-    new IterableOps[CC, A1, A2](tuple)
-
-
-/* A more general version which will probably not work.
-  implicit def tupleOfIterableWrapper[CC[+B] <: Iterable[B] with IterableTemplate[CC, B], A1, A2, B1 <: CC[A1]](tuple: B1, Iterable[A2]) =
-    new IterableOps[CC, A1, A2](tuple)
-*/
-
-  // Adriaan: If you drop the type parameters it will infer the wrong types.
-  tupleOfIterableWrapper[collection.immutable.List, Int, Int]((collection.immutable.Nil, collection.immutable.Nil)) forall (_ + _ < 10)
-}
-
-/** Tuple2 is the canonical representation of a @see Product2
- *
- */
-case class Tuple2[+T1, +T2](_1:T1, _2:T2)
-  extends Product2[T1, T2]  {
-
-   override def toString() = {
-     val sb = new StringBuilder
-     sb.append('(').append(_1).append(',').append(_2).append(')')
-     sb.toString
-   }
-
-  /** Swap the elements of the tuple */
-  def swap: Tuple2[T2,T1] = Tuple2(_2, _1)
-
-}
diff --git a/src/library/scalax/collection/Iterable.scala b/src/library/scalax/collection/Iterable.scala
deleted file mode 100755
index 3dc181707c..0000000000
--- a/src/library/scalax/collection/Iterable.scala
+++ /dev/null
@@ -1,160 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection
-
-import generic._
-import collection.immutable.{List, Nil, ::}
-import annotation.unchecked.uncheckedVariance
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *
- *  @author  Matthias Zenger
- *  @autor   Martin Odersky
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait Iterable[+A] extends IterableTemplate[Iterable, A @uncheckedVariance] { self =>
-
-  /** Creates a view of this iterable @see Iterable.View
-  def view: View[Iterable, A] = new View[Iterable, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin: self.type = self
-    val elements: Iterator[A] = self.elements
-  }
-   */
-}
-
-/** Various utilities for instances of <a href="Iterable.html">Iterable</a>.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
- */
-object Iterable extends IterableFactory[Iterable] with EmptyIterableFactory[Iterable] {
-
-  /** The empty iterable */
-  val empty: Iterable[Nothing] = Nil
-
-  class ComparableIterableOps[A](seq: Iterable[A], cmp: Ordering[A]) {
-    def min: A = {
-      require(!seq.isEmpty, "min(<empty>)")
-      var acc = seq.elements.next
-      for (x <- seq)
-        if (cmp.lt(x, acc)) acc = x
-      acc
-    }
-    def max: A = {
-      require(!seq.isEmpty, "max(<empty>)")
-      var acc = seq.elements.next
-      for (x <- seq)
-        if (cmp.gt(x, acc)) acc = x
-      acc
-    }
-  }
-
-  class NumericIterableOps[A](seq: Iterable[A], num: Numeric[A]) {
-    def sum: A = {
-      var acc = num.zero
-      for (x <- seq) acc = num.plus(acc, x)
-      acc
-    }
-    def product: A = {
-      var acc = num.one
-      for (x <- seq) acc = num.times(acc, x)
-      acc
-    }
-  }
-
-  class IterableIterableOps[C[+B] <: Iterable[B] with IterableTemplate[C, B @uncheckedVariance], A](self: C[C[A]]) {
-    def flatten: C[A] = {
-      val b: generic.Builder[C, A] = self.newBuilder[A]
-      for (xs <- self)
-        b ++= xs
-      b.result
-    }
-
-    def transpose: C[C[A]] = {
-      val bs: scala.Array[generic.Builder[C, A]] = self.head.map(_ => self.newBuilder[A]).toArray
-      for (xs <- self) {
-        var i = 0
-        for (x <- xs) {
-          bs(i) += x
-          i += 1
-        }
-      }
-      val bb = self.newBuilder[C[A]]
-      for (b <- bs) bb += b.result
-      bb.result
-    }
-  }
-
-
-  class PairIterableOps[C[+B] <: Iterable[B], A1, A2](self: C[(A1, A2)]) {
-    def unzip: (C[A1], C[A2]) = {
-      val as = self.newBuilder[A1].asInstanceOf[Builder[C, A1]]
-      val bs = self.newBuilder[A2].asInstanceOf[Builder[C, A2]]
-      for ((a, b) <- self) {
-        as += a
-        bs += b
-      }
-      (as.result, bs.result)
-    }
-  }
-
-  implicit def comparableIterableWrapper[A](seq: Iterable[A])(implicit cmp: Ordering[A]) =
-    new ComparableIterableOps(seq, cmp)
-  implicit def numericIterableWrapper[A](seq: Iterable[A])(implicit num: Numeric[A]) =
-    new NumericIterableOps(seq, num)
-  implicit def iterableIterableWrapper[C[+B] <: Iterable[B] with IterableTemplate[C, B], A](seq: C[C[A]]) =
-    new IterableIterableOps[C, A](seq)
-  implicit def pairIterableWrapper[C[+B] <: Iterable[B], A1, A2](seq: C[(A1, A2)]) =
-    new PairIterableOps[C, A1, A2](seq)
-
-  type View[A] = IterableView[UC, A] forSome { type UC[B] <: Iterable[B] }
-
-  /** @deprecated use View instead
-   */
-  @deprecated type Projection[A] = View[A]
-
-  /** The minimum element of a non-empty sequence of ordered elements
-   *  @deprecated use seq.min instead
-   */
-  @deprecated def min[A <% Ordered[A]](seq: Iterable[A]): A = {
-    val xs = seq.elements
-    if (!xs.hasNext) throw new IllegalArgumentException("min(<empty>)")
-    var min = xs.next
-    while (xs.hasNext) {
-      val x = xs.next
-      if (x < min) min = x
-    }
-    min
-  }
-
-  /** The maximum element of a non-empty sequence of ordered elements
-   *  @deprecated use seq.max iConstead
-   */
-  @deprecated def max[A <% Ordered[A]](seq: Iterable[A]): A = {
-    val xs = seq.elements
-    if (!xs.hasNext) throw new IllegalArgumentException("max(<empty>)")
-    var max = xs.next
-    while (xs.hasNext) {
-      val x = xs.next
-      if (max < x) max = x
-    }
-    max
-  }
-
-}
-
diff --git a/src/library/scalax/collection/OrderedIterable.scala b/src/library/scalax/collection/OrderedIterable.scala
deleted file mode 100755
index 9a0b77e575..0000000000
--- a/src/library/scalax/collection/OrderedIterable.scala
+++ /dev/null
@@ -1,41 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection
-
-import generic._
-import immutable.Nil
-import annotation.unchecked.uncheckedVariance
-
-/** An ordered collection is a collection with a fixed sequence of elements
- *  which is the same in every run.
- *
- *  for any two ordered collections c1 and c2.
- *  Ordered collections support
- *    - operations that form subsequences: take, takeWhile, drop, dropWhile,
- *    - zip, unzip
- *
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait OrderedIterable[+A] extends Iterable[A] with OrderedIterableTemplate[OrderedIterable, A @uncheckedVariance]
-
-/** Various utilities for instances of <a href="Iterable.html">Iterable</a>.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
- */
-object OrderedIterable extends IterableFactory[OrderedIterable] with EmptyIterableFactory[OrderedIterable] {
-
-  val empty: OrderedIterable[Nothing] = Nil
-
-}
diff --git a/src/library/scalax/collection/Sequence.scala b/src/library/scalax/collection/Sequence.scala
deleted file mode 100755
index 48081c99e8..0000000000
--- a/src/library/scalax/collection/Sequence.scala
+++ /dev/null
@@ -1,47 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
-
-
-package scalax.collection
-
-import generic._
-import immutable.Nil
-import annotation.unchecked.uncheckedVariance
-
-/** Class <code>Sequence[A]</code> represents finite sequences of elements
- *  of type <code>A</code>.
- *
- *  @author  Martin Odersky
- *  @author  Matthias Zenger
- *  @version 1.0, 16/07/2003
- */
-trait Sequence[+A] extends OrderedIterable[A] with SizedIterable[A] with SequenceTemplate[Sequence, A @uncheckedVariance]
-
-object Sequence extends SequenceFactory[Sequence] with EmptyIterableFactory[Sequence] {
-
-  /** The empty sequence */
-  val empty : Sequence[Nothing] = immutable.Nil
-
-  type View[+UC[B] <: Sequence[B], A] = SequenceView[UC, A]
-
-  /** @deprecated use View instead
-   */
-  @deprecated type Projection[A] = View[C, A] forSome { type C[+B] <: Sequence[B] }
-
-  /** @deprecated use Sequence(value) instead */
-  @deprecated def singleton[A](value: A) = Sequence(value)
-
-  /** Builds a singleton sequence.
-   *
-   * @deprecated use <code>Sequence(x)</code> instead.
-   */
-  @deprecated def single[A](x: A) = singleton(x)
-}
-
diff --git a/src/library/scalax/collection/SizedIterable.scala b/src/library/scalax/collection/SizedIterable.scala
deleted file mode 100644
index 4463c268b9..0000000000
--- a/src/library/scalax/collection/SizedIterable.scala
+++ /dev/null
@@ -1,38 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Collection.scala 12340 2007-07-17 15:29:47Z mcdirmid $
-
-
-package scalax.collection
-
-/** Variant of <code>Iterable</code> which also demands
- *  implementation of a `size` method.
- *  Basically, this trait just adds size to Iterable,
- *  and provides an optimized implementation of toArray based on it.
- *
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait SizedIterable[+A] extends Iterable[A] {
-
-  /** Returns the number of elements in this collection.
-    *
-    *  @return number of collection elements.
-    */
-  def size : Int
-
-  /** Converts this iterable to a fresh Array with <code>size</code> elements.
-    */
-  override def toArray[B >: A]: Array[B] = {
-    val result = new Array[B](size)
-    copyToArray(result, 0)
-    result
-  }
-}
-
diff --git a/src/library/scalax/collection/Vector.scala b/src/library/scalax/collection/Vector.scala
deleted file mode 100755
index 8224a8630b..0000000000
--- a/src/library/scalax/collection/Vector.scala
+++ /dev/null
@@ -1,23 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
-
-package scalax.collection
-
-import generic._
-import mutable.ArrayBuffer
-import annotation.unchecked.uncheckedVariance
-
-trait Vector[+A] extends Sequence[A] with VectorTemplate[Vector, A @uncheckedVariance]
-
-object Vector extends SequenceFactory[Vector] with EmptyIterableFactory[Vector] {
-
-  /** The empty sequence */
-  val empty : Vector[Nothing] = null // !!! todo: insert good immutable vector implementation here.
-}
diff --git a/src/library/scalax/collection/generic/Builder.scala b/src/library/scalax/collection/generic/Builder.scala
deleted file mode 100755
index 155ca553fa..0000000000
--- a/src/library/scalax/collection/generic/Builder.scala
+++ /dev/null
@@ -1,31 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
-
-package scalax.collection.generic
-
-import generic._
-
-trait Builder[+CC[B], A] extends Growable[A] {
-  def +=(x: A)
-  def elements: Iterator[A]
-  def result: CC[A]
-
-  def mapResult[DD[B]](f: CC[A] => DD[A]) =
-    new Builder[DD, A] with Proxy {
-      val self = Builder.this
-      def +=(x: A) = self += x
-      def elements: Iterator[A] = self.elements
-      def clear() = self.clear()
-      override def ++=(xs: Iterator[A]) = self ++= xs
-      override def ++=(xs: collection.Iterable[A]) = self ++= xs
-      def result: DD[A] = f(Builder.this.result)
-    }
-}
-
diff --git a/src/library/scalax/collection/generic/EmptyIterableFactory.scala b/src/library/scalax/collection/generic/EmptyIterableFactory.scala
deleted file mode 100755
index 7f110d13d2..0000000000
--- a/src/library/scalax/collection/generic/EmptyIterableFactory.scala
+++ /dev/null
@@ -1,17 +0,0 @@
-package scalax.collection.generic
-
-import annotation.unchecked.uncheckedVariance
-
-trait EmptyIterableFactory[CC[+A] <: Iterable[A] with IterableTemplate[CC, A @uncheckedVariance]] extends IterableFactory[CC] {
-
-  /** The empty collection of type CC */
-  val empty: CC[Nothing]
-
-  /** An override of newBuilder, to work off the empty object */
-  override protected def newBuilder[A]: Builder[CC, A] =
-    empty.newBuilder[A]
-
-  /** Create CC collection of specified elements */
-  override def apply[A](args: A*): CC[A] =
-    empty ++ args.asInstanceOf[Iterable[A]]
-}
diff --git a/src/library/scalax/collection/generic/IterableFactory.scala b/src/library/scalax/collection/generic/IterableFactory.scala
deleted file mode 100755
index 0cf9c8ac95..0000000000
--- a/src/library/scalax/collection/generic/IterableFactory.scala
+++ /dev/null
@@ -1,122 +0,0 @@
-package scalax.collection.generic
-
-trait IterableFactory[CC[A] <: Iterable[A]] {
-
-  /** Create CC collection of specified elements */
-  def apply[A](args: A*): CC[A]
-
-  protected def newBuilder[A]: Builder[CC, A] =
-    apply().newBuilder[A].asInstanceOf[Builder[CC, A]]
-
-  // can't have an empty here because it is defined in subclass EmptyIterableFactory with type
-  // CC[Nothing]. This type does not make sense for immutable iterables.
-
-  /** Concatenate all the argument lists into a single list.
-   *
-   *  @param xss the lists that are to be concatenated
-   *  @return the concatenation of all the lists
-   */
-  def concat[A](xss: CC[A]*): CC[A] = {
-    val b = newBuilder[A]
-    for (xs <- xss) b ++= xs
-    b.result
-  }
-
-  /** An iterable that contains the same element a number of times
-   *  @param   n  The number of elements returned
-   *  @param   elem The element returned each time
-   */
-  def fill[A](n: Int)(elem: => A): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    while (i < n) {
-      b += elem
-      i += 1
-    }
-    b.result
-  }
-
-  def fill[A](n1: Int, n2: Int)(elem: => A): CC[CC[A]] =
-    tabulate(n1)(_ => fill(n2)(elem))
-
-  def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): CC[CC[CC[A]]] =
-    tabulate(n1)(_ => fill(n2, n3)(elem))
-
-  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): CC[CC[CC[CC[A]]]] =
-    tabulate(n1)(_ => fill(n2, n3, n4)(elem))
-
-  def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): CC[CC[CC[CC[CC[A]]]]] =
-    tabulate(n1)(_ => fill(n2, n3, n4, n5)(elem))
-
-  def tabulate[A](n: Int)(f: Int => A): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    while (i < n) {
-      b += f(i)
-      i += 1
-    }
-    b.result
-  }
-
-  def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): CC[CC[A]] =
-    tabulate(n1)(i1 => tabulate(n2)(f(i1, _)))
-
-  def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): CC[CC[CC[A]]] =
-    tabulate(n1)(i1 => tabulate(n2, n3)(f(i1, _, _)))
-
-  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): CC[CC[CC[CC[A]]]] =
-    tabulate(n1)(i1 => tabulate(n2, n3, n4)(f(i1, _, _, _)))
-
-  def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): CC[CC[CC[CC[CC[A]]]]] =
-    tabulate(n1)(i1 => tabulate(n2, n3, n4, n5)(f(i1, _, _, _, _)))
-
-  /** Create a sequence of increasing integers in a range.
-   *
-   *  @param from the start value of the sequence
-   *  @param end the end value of the sequence
-   *  @return the sorted list of all from `from` (inclusive)
-   *  up to, but exclusding, `end`.
-   */
-  def range[A](start: Int, end: Int): CC[Int] = range(start, end, 1)
-
-  /** Create a sequence of increasing integers in a range.
-   *
-   *  @param from the start value of the sequence
-   *  @param end the end value of the sequence
-   *  @param step the increment value of successive elements
-   *  @return a list of values <code>from + n * step</code> for
-   *          increasing n. If `step > 0` the sequence terminates
-   *          with the largest value less than `end`. If `step < 0`
-   *          the sequence terminates with the smallest value greater than `end`.
-   *          If `step == 0`, an IllegalArgumentException is thrown.
-   */
-  def range(start: Int, end: Int, step: Int): CC[Int] = {
-    if (step == 0) throw new IllegalArgumentException("zero step")
-    val b = newBuilder[Int]
-    var i = start
-    while ((step <= 0 || i < end) && (step >= 0 || i > end)) {
-      b += i
-      i += step
-    }
-    b.result
-  }
-
-  /** Create a sequence by repeatedly applying a given function to a start value.
-   *
-   *  @param start the start value of the sequence
-   *  @param len   the length of the sequence
-   *  @param f     the function that's repeatedly applied
-   *  @return      the sequence with elements <code>(start, f(start), f(f(start)), ..., f<sup>len-1</sup>(start))</code>
-   */
-  def iterate(start: Int, len: Int)(f: Int => Int): CC[Int] = {
-    val b = newBuilder[Int]
-    var acc = start
-    var i = 0
-    while (i < len) {
-      b += acc
-      acc = f(acc)
-      i += 1
-    }
-    b.result
-  }
-}
diff --git a/src/library/scalax/collection/generic/IterableForwarder.scala b/src/library/scalax/collection/generic/IterableForwarder.scala
deleted file mode 100644
index e38f030414..0000000000
--- a/src/library/scalax/collection/generic/IterableForwarder.scala
+++ /dev/null
@@ -1,59 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
-
-
-package scalax.collection.generic
-
-import collection.mutable.Buffer
-import collection.immutable.{List, Stream}
-
-/** This trait implements a forwarder for iterable objects. It forwards
- *  all calls to a different iterable object, except for
- *
- *    - toString, hashCode, equals, stringPrefix
- *    - newBuilder, view
- *    - all calls creating a new iterable objetc of the same kind
- *
- *  The above methods are forwarded by subclass IterableProxy
- *
- *  @author  Martin Odersky
- *  @version 2.8
- */
-trait IterableForwarder[+A] extends Iterable[A] {
-
-  /** The iterable object to which calls are forwarded */
-  protected def underlying: Iterable[A]
-
-  // Iterable delegates
-  // Iterable methods could be printed by  cat IterableTemplate.scala | sed -n '/trait Iterable/,$ p' | egrep '^  (override )?def'
-
-  override def elements = underlying.elements
-  override def isEmpty = underlying.isEmpty
-  override def hasDefiniteSize = underlying.hasDefiniteSize
-  override def foreach(f: A => Unit) = underlying.foreach(f)
-  override def forall(p: A => Boolean): Boolean = underlying.forall(p)
-  override def exists(p: A => Boolean): Boolean = underlying.exists(p)
-  override def count(p: A => Boolean): Int = underlying.count(p)
-  override def find(p: A => Boolean): Option[A] = underlying.find(p)
-  override def foldLeft[B](z: B)(op: (B, A) => B): B = underlying.foldLeft(z)(op)
-  override def foldRight[B](z: B)(op: (A, B) => B): B = underlying.foldRight(z)(op)
-  override def reduceLeft[B >: A](op: (B, A) => B): B = underlying.reduceLeft(op)
-  override def reduceRight[B >: A](op: (A, B) => B): B = underlying.reduceRight(op)
-  override def copyToBuffer[B >: A](dest: Buffer[B]) = underlying.copyToBuffer(dest)
-  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) = underlying.copyToArray(xs, start, len)
-  override def toArray[B >: A]: Array[B] = underlying.toArray
-  override def toList: List[A] = underlying.toList
-  override def toSequence: Sequence[A] = underlying.toSequence
-  override def toStream: Stream[A] = underlying.toStream
-  override def mkString(start: String, sep: String, end: String): String = underlying.mkString(start, sep, end)
-  override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = underlying.addString(b, start, sep, end)
-
-  override def head: A = underlying.head
-}
diff --git a/src/library/scalax/collection/generic/IterableTemplate.scala b/src/library/scalax/collection/generic/IterableTemplate.scala
deleted file mode 100755
index cc562c308a..0000000000
--- a/src/library/scalax/collection/generic/IterableTemplate.scala
+++ /dev/null
@@ -1,677 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection.generic
-
-import scalax.collection.mutable.{Buffer, ArrayBuffer, ListBuffer}
-import scalax.collection.immutable.{List, Nil, ::, Stream}
-import util.control.Breaks._
-import Iterable._
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>Collection</code>.
- *        Only potentially unbounded collections should directly sub-class <code>Iterable</code>.
- *  @author Matthias Zenger
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait IterableTemplate[+CC[/*+*/B] <: IterableTemplate[CC, B] with Iterable[B], /*+*/A] { self/*: CC[A]*/ =>
-
-  /** The template itself seen as an instance of `CC[A]`.
-   * @note: It would be logical to have a self type `CC[A]` instead, then we would not need
-   * this method. Unfortunately, tyis runs afoul some pecularities in Scala's member resolution
-   * algorithm: If the self type is a CC, then Iterable is one of its supertypes. Iterable
-   * defines a number of concrete methods such as newBuilder which are abstract here.
-   * The newBuilder method in Iterable[A] has type Builder[Iterable, A]. Because Scala
-   * prefers concrete over abstract members, it is this newBuilder which is chosen, instead of
-   * the abstract newBuilder in class IterableTemplate of type Builder[CC, A].
-   * Even for concrete methods we have a problem because the last mixin in the parents of CC is
-   * Iterable, not IterableTemplate. So resolution picks the version in Iterable, which returns
-   * again an Iterable, not a CC, as would be required.
-   * These problems would be avoided if Scala computed the type of a member as the glb of the types
-   * all members in the class and its superclasses types.
-   * I think overall this would be a better design.
-   */
-  protected[this] def thisCC: CC[A] = this.asInstanceOf[CC[A]]
-
-  /** Creates a new iterator over all elements contained in this
-   *  object.
-   *
-   *  @return the new iterator
-   */
-  def elements: Iterator[A]
-
-  /** Create a new builder for this IterableType
-   */
-  def newBuilder[B]: Builder[CC, B]
-
-  /** Create a new builder for this IterableType
-   *  with a hint what that its size should be size `sizeHint`
-   */
-  def newBuilder[B](sizeHint: Int): Builder[CC, B] = newBuilder[B]
-
-  /** Is this collection empty? */
-  def isEmpty: Boolean = !elements.hasNext
-
-  /** returns true iff this collection has a bound size.
-   *  Many APIs in this trait will not work on collections of
-   *  unbound sizes.
-   */
-  def hasDefiniteSize = true
-
-  /** Create a new iterable of type CC which contains all elements of this iterable
-   *  followed by all elements of Iterable `that'
-   */
-  def ++[B >: A](that: Iterable[B]): CC[B] = {
-    val b: Builder[CC, B] = (this: IterableTemplate[CC, A]).newBuilder[B]
-    b ++= thisCC
-    b ++= that
-    b.result
-  }
-
-  /** Create a new iterable of type CC which contains all elements of this iterable
-   *  followed by all elements of Iterator `that'
-   */
-  def ++[B >: A](that: Iterator[B]): CC[B] = {
-    val b = newBuilder[B]
-    b ++= thisCC
-    b ++= that
-    b.result
-  }
-
-  /** Returns the iterable resulting from applying the given function
-   *  <code>f</code> to each element of this iterable.
-   *
-   *  @param f function to apply to each element.
-   *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
-   *           iterable is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  def map[B](f: A => B): CC[B] = {
-    val b = newBuilder[B]
-    for (x <- this) b += f(x)
-    b.result
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this iterable, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this iterable is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  def flatMap[B](f: A => Iterable[B]): CC[B] = {
-    val b = newBuilder[B]
-    for (x <- this) b ++= f(x)
-    b.result
-  }
-
-  /** Returns all the elements of this iterable that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *  @param p the predicate used to filter the iterable.
-   *  @return the elements of this iterable satisfying <code>p</code>.
-   */
-  def filter(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    for (x <- this)
-      if (p(x)) b += x
-    b.result
-  }
-
-  /** Removes all elements of the iterable which satisfy the predicate
-   *  <code>p</code>. This is like <code>filter</code> with the
-   *  predicate inversed.
-   *
-   *  @param p the predicate to use to test elements
-   *  @return  the iterable without all elements which satisfy <code>p</code>
-   */
-  def remove(p: A => Boolean): CC[A] = filter(!p(_))
-
-  /** Partitions this iterable in two iterables according to a predicate.
-   *
-   *  @param p the predicate on which to partition
-   *  @return  a pair of iterables: the iterable that satisfies the predicate
-   *           <code>p</code> and the iterable that does not.
-   *           The relative order of the elements in the resulting iterables
-   *           is the same as in the original iterable.
-   */
-  def partition(p: A => Boolean): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    for (x <- this) (if (p(x)) l else r) += x
-    (l.result, r.result)
-  }
-
-  /** Apply a function <code>f</code> to all elements of this
-   *  iterable object.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  f   a function that is applied to every element.
-   *  Note this function underlies the implementation of most other bulk operations.
-   *  It should be overridden in concrete collectionc classes with efficient implementations.
-   */
-  def foreach(f: A => Unit): Unit = elements.foreach(f)
-
-  /** Return true iff the given predicate `p` yields true for all elements
-   *  of this iterable.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   */
-  def forall(p: A => Boolean): Boolean = {
-    var result = true
-    breakable {
-      for (x <- this)
-        if (!p(x)) { result = false; break }
-    }
-    result
-  }
-
-  /** Return true iff there is an element in this iterable for which the
-   *  given predicate `p` yields true.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   */
-  def exists(p: A => Boolean): Boolean = {
-    var result = false
-    breakable {
-      for (x <- this)
-        if (p(x)) { result = true; break }
-    }
-    result
-  }
-
-  /** Count the number of elements in the iterable which satisfy a predicate.
-   *
-   *  @param p the predicate for which to count
-   *  @return  the number of elements satisfying the predicate <code>p</code>.
-   */
-  def count(p: A => Boolean): Int = {
-    var cnt = 0
-    for (x <- this) {
-      if (p(x)) cnt += 1
-    }
-    cnt
-  }
-
-  /** Find and return the first element of the iterable object satisfying a
-   *  predicate, if any.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param p the predicate
-   *  @return an option containing the first element in the iterable object
-   *  satisfying <code>p</code>, or <code>None</code> if none exists.
-   */
-  def find(p: A => Boolean): Option[A] = {
-    var result: Option[A] = None
-    breakable {
-      for (x <- this)
-        if (p(x)) { result = Some(x); break }
-    }
-    result
-  }
-
-  /** Combines the elements of this iterable object together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the iterable is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  def foldLeft[B](z: B)(op: (B, A) => B): B = {
-    var result = z
-    for (x <- this)
-      result = op(result, x)
-    result
-  }
-
-  /** Combines the elements of this iterable together using the binary
-   *  function <code>f</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the iterable is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  def foldRight[B](z: B)(op: (A, B) => B): B = elements.foldRight(z)(op)
-
-  /** Similar to <code>foldLeft</code> but can be used as
-   *  an operator with the order of iterable and zero arguments reversed.
-   *  That is, <code>z /: xs</code> is the same as <code>xs foldLeft z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   */
-  def /: [B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
-
-  /** An alias for <code>foldRight</code>.
-   *  That is, <code>xs :\ z</code> is the same as <code>xs foldRight z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   */
-  def :\ [B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the iterable object has elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the iterable object is empty.
-   */
-  def reduceLeft[B >: A](op: (B, A) => B): B = {
-    if (isEmpty) throw new UnsupportedOperationException("empty.reduceLeft")
-    var result: B = elements.next
-    var first = true
-    for (x <- this)
-      if (first) first = false
-      else result = op(result, x)
-    result
-  }
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   *
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  def reduceRight[B >: A](op: (A, B) => B): B =
-    elements.reduceRight(op)
-
-  /** Returns an iterable formed from this iterable and the specified iterable
-   *  `other` by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two iterables is longer than the other, its remaining elements are ignored.
-   */
-  def zip[B](that: Iterable[B]): CC[(A, B)] = {
-    val these = this.elements
-    val those = that.elements
-    val b = this.newBuilder[(A, B)]
-    while (these.hasNext && those.hasNext)
-      b += ((these.next, those.next))
-    b.result
-  }
-
-  /** Returns a iterable formed from this iterable and the specified iterable
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *
-   *  @param that     iterable <code>that</code> may have a different length
-   *                  as the self iterable.
-   *  @param thisElem element <code>thisElem</code> is used to fill up the
-   *                  resulting iterable if the self iterable is shorter than
-   *                  <code>that</code>
-b   *  @param thatElem element <code>thatElem</code> is used to fill up the
-   *                  resulting iterable if <code>that</code> is shorter than
-   *                  the self iterable
-   *  @return         <code>Iterable((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
-   *                  ..., {elem,b<sub>m</sub>})</code>
-   *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
-   *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
-   *                  invoked where <code>m &gt; n</code>.
-   */
-  def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): CC[(A1, B1)] = {
-    val these = this.elements
-    val those = that.elements
-    val b = newBuilder[(A1, B1)]
-    while (these.hasNext && those.hasNext)
-      b += ((these.next, those.next))
-    while (these.hasNext)
-      b += ((these.next, thatElem))
-    while (those.hasNext)
-      b += ((thisElem, those.next))
-    b.result
-  }
-
-  /** Zips this iterable with its indices. `s.zipWithIndex` is equivalent to
-   *  `s zip s.indices`, but is usually more efficient.
-   */
-  def zipWithIndex: CC[(A, Int)] = {
-    val b = newBuilder[(A, Int)]
-    var i = 0
-    for (x <- this) {
-      b += ((x, i))
-      i +=1
-    }
-    b.result
-  }
-
-  /** Copy all elements to a given buffer
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  dest   The buffer to which elements are copied
-   */
-  def copyToBuffer[B >: A](dest: Buffer[B]) {
-    for (x <- this) dest += x
-  }
-
-  /** Fills the given array <code>xs</code> with at most `len` elements of
-   *  this iterable starting at position `start`.
-   *  Copying will stop oce either the end of the current iterable is reached or
-   *  `len` elements have been copied.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @param  len number of elements to copy
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
-    var i = start
-    val end = (start + len) min xs.length
-    for (x <- this) {
-      if (i < end) {
-        xs(i) = x
-        i += 1
-      }
-    }
-  }
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this iterable starting at position <code>start</code>
-   *  until either the end of the current iterable or the end of array `xs` is reached.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int) {
-    copyToArray(xs, start, xs.length - start)
-  }
-
-  /** Converts this collection to a fresh Array elements.
-   *  @note  Will not terminate for infinite-sized collections.
-   */
-  def toArray[B >: A]: Array[B] = {
-    var size = 0
-    for (x <- this) size += 1
-    val result = new Array[B](size)
-    copyToArray(result, 0)
-    result
-  }
-
-  /**
-   *  Create a fresh list with all the elements of this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toList: List[A] = (new ListBuffer[A] ++ thisCC).toList
-
-  /**
-   *  Returns a sequence containing all of the elements in this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toSequence: Sequence[A] = toList
-
-  /** @deprecated use toSequence instead
-   */
-  @deprecated def toSeq: Sequence[A] = toSequence
-
-  /**
-   *  Create a stream which contains all the elements of this iterable object.
-   *  @note consider using <code>projection</code> for lazy behavior.
-   */
-  def toStream: Stream[A] = elements.toStream
-
-  /** Sort the iterable according to the comparison function
-   *  <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>,
-   *  which should be true iff <code>e1</code> is smaller than
-   *  <code>e2</code>.
-   *  The sort is stable. That is elements that are equal wrt `lt` appear in the
-   *  same order in the sorted iterable as in the original.
-   *
-   *  @param lt the comparison function
-   *  @return   a iterable sorted according to the comparison function
-   *            <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>.
-   *  @ex <pre>
-   *    List("Steve", "Tom", "John", "Bob")
-   *      .sort((e1, e2) => (e1 compareTo e2) &lt; 0) =
-   *    List("Bob", "John", "Steve", "Tom")</pre>
-   *  !!!
-  def sortWith(lt : (A,A) => Boolean): CC[A] = {
-    val arr = toArray
-    Array.sortWith(arr, lt)
-    val b = newBuilder[A]
-    for (x <- arr) b += x
-    b.result
-  }
-  */
-
-  /** Returns a string representation of this iterable object. The resulting string
-   *  begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   *
-   *  @ex  <code>List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"</code>
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(start: String, sep: String, end: String): String =
-    addString(new StringBuilder(), start, sep, end).toString
-
-  /** Returns a string representation of this iterable object. The string
-   *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   *
-   *  @param sep separator string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(sep: String): String =
-    addString(new StringBuilder(), sep).toString
-
-  /** Converts a collection into a flat <code>String</code> by each element's toString method.
-   */
-  def mkString =
-    addString(new StringBuilder()).toString
-
-  /** Write all elements of this iterable into given string builder.
-   *  The written text begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   */
-  def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
-    b append start
-    var first = true
-    for (x <- this) {
-      if (first) first = false
-      else b append sep
-      b append x
-    }
-    b append end
-  }
-
-  /** Write all elements of this string into given string builder.
-   *  The string representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   */
-  def addString(b: StringBuilder, sep: String): StringBuilder = addString(b, "", sep, "")
-
-  /** Write all elements of this string into given string builder without using
-   *  any separator between consecutive elements.
-   */
-  def addString(b: StringBuilder): StringBuilder = addString(b, "")
-
-  /**
-   * returns a projection that can be used to call non-strict <code>filter</code>,
-   * <code>map</code>, and <code>flatMap</code> methods that build projections
-   * of the collection.
-  def projection : Iterable.Projection[A] = new Iterable.Projection[A] {
-    def elements = Iterable.this.elements
-    override def force = Iterable.this
-  }
-   */
-
-  override def toString = mkString(stringPrefix + "(", ", ", ")")
-
-  /** Defines the prefix of this object's <code>toString</code> representation.
-   */
-  def stringPrefix : String = {
-    var string = this.getClass.getName
-    val idx1 = string.lastIndexOf('.' : Int)
-    if (idx1 != -1) string = string.substring(idx1 + 1)
-    val idx2 = string.indexOf('$')
-    if (idx2 != -1) string = string.substring(0, idx2)
-    string
-  }
-
-  /** Creates a view of this iterable @see IterableView
-   */
-  def view: IterableView[CC, A] = new IterableView[CC, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin = thisCC
-    val elements: Iterator[A] = self.elements
-  }
-
-// The following methods return non-deterministic results, unless this iterable is an OrderedIterable
-
-  /** The first element of this iterable.
-   *
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   *  @throws Predef.NoSuchElementException if the iterable is empty.
-   */
-  def head: A = if (isEmpty) throw new NoSuchElementException else elements.next
-
-   /** @deprecated  use head instead */
-  @deprecated def first: A = head
-
-  /** Returns as an option the first element of this iterable
-   *  or <code>None</code> if iterable is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def headOption: Option[A] = if (isEmpty) None else Some(head)
-
-  /** @deprecated use headOption instead
-   *  <code>None</code> if iterable is empty.
-   */
-  @deprecated def firstOption: Option[A] = headOption
-
-  /** An iterable consisting of all elements of this iterable
-   *  except the first one.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def tail: CC[A] = drop(1)
-
-  /** Return an iterable consisting only of the first <code>n</code>
-   *  elements of this iterable, or else the whole iterable, if it has less
-   *  than <code>n</code> elements.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def take(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    breakable {
-      for (x <- this) {
-        b += x
-        i += 1
-        if (i == n) break
-      }
-    }
-    b.result
-  }
-
-  /** Returns this iterable without its <code>n</code> first elements
-   *  If this iterable has less than <code>n</code> elements, the empty
-   *  iterable is returned.
-   *
-   *  @param n the number of elements to drop
-   *  @return  the new iterable
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def drop(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    for (x <- this) {
-      if (i >= n) b += x
-      i += 1
-    }
-    b.result
-  }
-
-  /** A sub-iterable starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @note c.slice(from, to)  is equivalent to (but possibly more efficient than)
-   *  c.drop(from).take(to - from)
-   *
-   *  @param from   The index of the first element of the returned subsequence
-   *  @param until  The index of the element following the returned subsequence
-   *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-   *          or <code>length &lt; from + len<code>
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def slice(from: Int, until: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    breakable {
-      for (x <- this) {
-        if (i >= from) b += x
-        i += 1
-        if (i == until) break
-      }
-    }
-    b.result
-  }
-
-  /** Split the iterable at a given point and return the two parts thus
-   *  created.
-   *
-   *  @param n the position at which to split
-   *  @return  a pair of iterables composed of the first <code>n</code>
-   *           elements, and the other elements.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def splitAt(n: Int): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    var i = 0
-    for (x <- this)
-      (if (i < n) l else r) += x
-    (l.result, r.result)
-  }
-
-  /** A sub-iterable view  starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until  The index of the element following the slice
-   *  @note  The difference between `view` and `slice` is that `view` produces
-   *         a view of the current iterable, whereas `slice` produces a new iterable.
-   *
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   *  @note view(from, to)  is equivalent to view.slice(from, to)
-   */
-  def view(from: Int, until: Int): IterableView[CC, A] = view.slice(from, until)
-}
diff --git a/src/library/scalax/collection/generic/IterableView.scala b/src/library/scalax/collection/generic/IterableView.scala
deleted file mode 100755
index bb111e2252..0000000000
--- a/src/library/scalax/collection/generic/IterableView.scala
+++ /dev/null
@@ -1,112 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.generic
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait IterableView[+UC[/*+*/B] <: Iterable[B], /*+*/A] extends Iterable[A] { self =>
-
-  val origin: Iterable[_]
-  def elements: Iterator[A]
-
-  val underlying: Iterable[_] = origin match {
-    case v: IterableView[t, _] => v.underlying
-    case _ => origin
-  }
-
-  protected def isDelay = elements eq underlying.elements
-
-  private[this] var forced: UC[A] = _
-  private[this] var wasForced = false
-
-  def force: UC[A] = {
-    if (!wasForced) {
-      forced = {
-        val b = underlying.newBuilder[A]
-        for (x <- elements)
-          b += x
-        b.result
-      }.asInstanceOf[UC[A]]
-      wasForced = true
-    }
-    forced
-  }
-
-  def newBuilder[A] = underlying.newBuilder[A]
-
-  /** Builds a new view object. This method needs to be overridden in subclasses
-   *  which refine in IterableView type
-   */
-  protected def newView[B](elems: Iterator[B]) = new IterableView[UC, B] {
-    val origin = if (self.isDelay) self.origin else self
-    val elements = elems
-  }
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterator[B]): IterableView[UC, B] = newView(elements ++ that)
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterable[B]): IterableView[UC, B] = newView(elements ++ that.elements)
-
-  /** Non-strict variant of @see IterableLike.map */
-  override def map[B](f: A => B): IterableView[UC, B] = newView(elements map f)
-
-  /** Non-strict variant of @see IterableLike.flatMap */
-  override def flatMap[B](f: A => Iterable[B]): IterableView[UC, B] = newView(elements flatMap (f(_).elements))
-
-  /** Non-strict variant of @see IterableLike.filter */
-  override def filter(p: A => Boolean): IterableView[UC, A] = newView(elements filter p)
-
-  /** Non-strict variant of @see IterableLike.partition */
-  override def partition(p: A => Boolean): (IterableView[UC, A], IterableView[UC, A]) = {
-    val (li, ri) = elements partition p
-    (newView(li), newView(ri))
-  }
-
-  /** Non-strict variant of @see IterableLike.zip */
-  override def zip[B](other: Iterable[B]): IterableView[UC, (A, B)] = newView(elements zip other.elements)
-
-  /** Non-strict variant of @see IterableLike.zipWithIndex */
-  override def zipWithIndex: IterableView[UC, (A, Int)] = newView(elements.zipWithIndex)
-
-  /* Non-strict variant of @see IterableLike.zipAll
-   *  This is not enabled because it can't be specialized in VectorView:
-   *  VectorView is not covariant, yet must maintain updatability. Impossible to do this
-   *  with this type signature.
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): IterableView[UC, (A1, B1)] =
-    newView(elements zipAll (that.elements, thisElem, thatElem))
-   */
-
-  /** Non-strict variant of @see Iterable.take */
-  override def take(n: Int): IterableView[UC, A] = newView(elements take n)
-
-  /** Non-strict variant of @see Iterable.drop */
-  override def drop(n: Int): IterableView[UC, A] = newView(elements drop n)
-
-  /** Non-strict variant of @see Iterable.splitAt */
-  override def splitAt(n: Int): (IterableView[UC, A], IterableView[UC, A]) = (take(n), drop(n))
-
-  /** Non-strict variant of @see Iterable.slice */
-  override def slice(from: Int, until: Int): IterableView[UC, A] = newView(elements slice (from, until))
-
-  /** The projection resulting from the concatenation of this projection with the <code>rest</code> projection.
-   *  @param rest   The projection that gets appended to this projection
-   *  @deprecated   Use ++ instead
-   */
-  @deprecated def append[B >: A](rest : => Iterable[B]): IterableView[UC, B] = this ++ rest.elements
-
-  override def stringPrefix = origin.stringPrefix+"V"
-
-
-}
diff --git a/src/library/scalax/collection/generic/LazyBuilder.scala b/src/library/scalax/collection/generic/LazyBuilder.scala
deleted file mode 100755
index 74764351b6..0000000000
--- a/src/library/scalax/collection/generic/LazyBuilder.scala
+++ /dev/null
@@ -1,24 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
-
-package scalax.collection.generic
-
-import collection.mutable.ListBuffer
-import collection.immutable.{List, Nil, ::}
-
-abstract class LazyBuilder[+CC[B], A] extends Builder[CC, A] {
-  protected var parts = new ListBuffer[Iterator[A]]
-  def +=(x: A) = { parts += Iterator.single(x) }
-  override def ++=(xs: Iterator[A]) { parts += xs }
-  override def ++=(xs: Iterable[A]) { parts += xs.elements }
-  def elements: Iterator[A] = Iterator.iteratorIteratorWrapper(parts.elements).flatten // !!! can remove the wrapper once new compiler is in starr
-  def result: CC[A]
-  def clear() { parts.clear() }
-}
diff --git a/src/library/scalax/collection/generic/MapFactory.scala b/src/library/scalax/collection/generic/MapFactory.scala
deleted file mode 100755
index d7413b8928..0000000000
--- a/src/library/scalax/collection/generic/MapFactory.scala
+++ /dev/null
@@ -1,9 +0,0 @@
-package scalax.collection.generic
-
-trait MapFactory[CC[A, B] <: MapTemplate[A, B, CC]] {
-
-  def empty[A, B]: CC[A, B]
-
-  def apply[A, B](elems: (A, B)*): CC[A, B] = empty[A, B] ++ elems.asInstanceOf[Iterable[(A, B)]] // !@!
-
-}
diff --git a/src/library/scalax/collection/generic/MapView.scala b/src/library/scalax/collection/generic/MapView.scala
deleted file mode 100644
index 924fd1173e..0000000000
--- a/src/library/scalax/collection/generic/MapView.scala
+++ /dev/null
@@ -1,44 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.generic
-
-/** A non-strict view of a map.
- * @author Martin Odersky
- * @version 2.8
- */
-trait MapView[+UC[A1, B1] <: MapTemplate[A1, B1, UC] with Map[A1, B1], A, B] extends Map[A, B] { self =>
-
-  val origin: Map[A, _]
-
-  def empty[C] = origin.empty[C]
-
-  def elements: Iterator[(A, B)]
-
-  val underlying: Map[A, _] = origin match {
-    case v: MapView[t, _, _] => v.underlying
-    case _ => origin
-  }
-  private[this] var forced: UC[A, B] = _
-  private[this] var wasForced = false
-
-  def force: UC[A, B] = {
-    if (!wasForced) {
-      forced = underlying.empty[B].asInstanceOf[UC[A, B]] ++ elements
-      wasForced = true
-    }
-    forced
-  }
-
-  def update (key: A, value: B): UC[A, B] = force update (key, value)
-  def - (key: A): UC[A, B] = force - key
-}
-
-
diff --git a/src/library/scalax/collection/generic/MutableVectorTemplate.scala b/src/library/scalax/collection/generic/MutableVectorTemplate.scala
deleted file mode 100755
index 71c3f7bdf8..0000000000
--- a/src/library/scalax/collection/generic/MutableVectorTemplate.scala
+++ /dev/null
@@ -1,56 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
-
-package scalax.collection.generic
-
-import collection.mutable.Vector
-import collection.mutable.Vector._
-
-/** Sequences that support O(1) element access and O(1) length computation.
- *  plus an update operation.
- *  @author Sean McDirmid
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait MutableVectorTemplate[+CC[B] <: MutableVectorTemplate[CC, B] with Vector[B], A] extends VectorTemplate[CC, A] {
-self =>
-
-  def update(idx: Int, elem: A)
-
-  /** Creates a view of this iterable @see OrderedIterable.View
-   */
-  override def view: MutableVectorView[CC, A] = new MutableVectorView[CC, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin: Vector[_] = thisCC
-    val length: Int = self.length
-    def apply(idx: Int): A = self.apply(idx)
-    def update(idx: Int, elem: A) = self.update(idx, elem)
-  }
-
-  /** A sub-sequence view  starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until  The index of the element following the slice
-   *  @note  The difference between `view` and `slice` is that `view` produces
-   *         a view of the current sequence, whereas `slice` produces a new sequence.
-   *
-   *  @note view(from, to)  is equivalent to view.slice(from, to)
-   */
-  override def view(from: Int, until: Int): MutableVectorView[CC, A] = view.slice(from, until)
-
-  def readOnly: collection.Vector[A] = new collection.Vector[A] { //!!! just use a VectorProxy?
-    def length = self.length
-    def apply(idx : Int) = self.apply(idx)
-    def newBuilder[B]: Builder[collection.Vector, B] = self.newBuilder[B] //mapResult (_.readOnly)
-    override def foreach(f: A => Unit) = self.foreach(f)
-    override def stringPrefix = self.stringPrefix+"RO"
-  }
-}
-
diff --git a/src/library/scalax/collection/generic/MutableVectorView.scala b/src/library/scalax/collection/generic/MutableVectorView.scala
deleted file mode 100755
index d445ba336e..0000000000
--- a/src/library/scalax/collection/generic/MutableVectorView.scala
+++ /dev/null
@@ -1,97 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
-
-
-package scalax.collection.generic
-
-import collection.mutable.Vector
-import collection.mutable.Vector._
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait MutableVectorView[+UC[B] <: Vector[B], A] extends SequenceView[UC, A] with Vector[A] {
-self =>
-
-  /** refined from Iterable.View */
-  val origin: Vector[_]
-
-  override def newBuilder[A] = underlying.newBuilder[A].asInstanceOf[Builder[Vector, A]]
-
-  trait Transformed[B] extends super.Transformed[B] with MutableVectorView[UC, B] {
-    override val origin = self
-    override def elements: Iterator[B] = new Elements(0, length)
-    override protected def asCC = asInstanceOf[MutableVectorView[UC, B]]
-  }
-
-  class Appended(that: Vector[A]) extends super.Appended[A](that) with Transformed[A] {
-    override def update(idx: Int, elem: A)  {
-      val ll = self.length
-      if (idx < ll) self.update(idx, elem) else that.update(idx - ll, elem)
-    }
-  }
-
-  class Sliced(from: Int, to: Int) extends super.Sliced(from, to) with Transformed[A] {
-    override def update(idx: Int, elem: A) {
-      if (idx >= 0 && idx < length) self.update(idx + from, elem)
-      else throw new IndexOutOfBoundsException(idx.toString)
-    }
-    override def slice(from1: Int, to1: Int) =
-      new self.Sliced(from + (from1 min length max 0) , to + (to1 min length max 0))
-  }
-
-  class Reversed extends super.Reversed with Transformed[A] {
-    override def update(idx: Int, elem: A) {
-      self.update(length - 1 - idx, elem)
-    }
-  }
-
-  class Zipped[B](that: Vector[B]) extends super.Zipped[B](that) with Transformed[(A, B)] {
-    override def update(idx: Int, elem: (A, B)) {
-      self.update(idx, elem._1)
-      that.update(idx, elem._2)
-    }
-  }
-
-  def ++(that: Vector[A]): MutableVectorView[UC, A] =
-    new Appended(that).asCC
-
-  override def reverse: MutableVectorView[UC, A] =
-    (new Reversed).asCC
-
-  private def toVector[B](xs: Iterable[B]): Vector[B] = xs match {
-    case ras: Vector[_] => ras.asInstanceOf[Vector[B]]
-    case _ => Vector() ++ xs
-  }
-
-  override def zip[B](that: Iterable[B]): MutableVectorView[UC, (A, B)] =
-    new Zipped(toVector(that)).asCC
-
-  override def zipWithIndex: MutableVectorView[UC, (A, Int)] =
-    zip((0 until length).asInstanceOf[Null]) // !@!
-  override def take(n: Int): MutableVectorView[UC, A] =
-    slice(0, n)
-  override def drop(n: Int): MutableVectorView[UC, A] =
-    slice(n, Math.MAX_INT)
-  override def splitAt(n: Int): (MutableVectorView[UC, A], MutableVectorView[UC, A]) = (take(n), drop(n))
-  override def slice(from: Int, until: Int): MutableVectorView[UC, A] =
-    new Sliced(from, until).asCC
-  override def takeWhile(p: A => Boolean): MutableVectorView[UC, A] =
-    take(prefixLength(p))
-  override def dropWhile(p: A => Boolean): MutableVectorView[UC, A] =
-    drop(prefixLength(p))
-  override def span(p: A => Boolean): (MutableVectorView[UC, A], MutableVectorView[UC, A]) = {
-    val n = prefixLength(p)
-    (take(n), drop(n))
-  }
-}
-
diff --git a/src/library/scalax/collection/generic/OrderedIterableTemplate.scala b/src/library/scalax/collection/generic/OrderedIterableTemplate.scala
deleted file mode 100755
index 501cbf6447..0000000000
--- a/src/library/scalax/collection/generic/OrderedIterableTemplate.scala
+++ /dev/null
@@ -1,161 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection.generic
-
-import OrderedIterable._
-
-import util.control.Breaks._
-
-/** Ordered iterables are iterables where the `elements` method always returns elements in the same
- *  order (namely the order in which elements were appended to the iterable). In particular, one has
- *  for every two ordered iterables `xs` and `ys`:
- *
- *  `(xs ++ ys).elements = xs.elements ++ ys.elements
- */
-trait OrderedIterableTemplate[+CC[/*+*/B] <: OrderedIterableTemplate[CC, B] with OrderedIterable[B], /*+*/A]
-  extends IterableTemplate[CC, A] {
-
-  /** The last element of this iterable.
-   *
-   *  @throws Predef.NoSuchElementException if the iterable is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def last: A = {
-    var lst = head
-    for (x <- this)
-      lst = x
-    lst
-  }
-
-  /** Returns as an option the last element of this iterable or
-   *  <code>None</code> if iterable is empty.
-   *
-   *  @return the last element as an option.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def lastOption: Option[A] = if (isEmpty) None else Some(last)
-
-  /** An iterable consisting of all elements of this iterable except the last one.
-   *  @throws Predef.UnsupportedOperationException if the stream is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def init: CC[A] = {
-    if (isEmpty) throw new UnsupportedOperationException("empty.init")
-    var lst = head
-    val b = newBuilder[A]
-    for (x <- this) {
-      b += lst
-      lst = x
-    }
-    b.result
-  }
-
-  /** Returns the rightmost <code>n</code> elements from this iterable.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def takeRight(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    val lead = elements drop n
-    var go = false
-    for (x <- this) {
-      if (go) b += x
-      else if (lead.hasNext) lead.next
-      else go = true
-    }
-    b.result
-  }
-
-  /** Returns the iterable wihtout its rightmost <code>n</code> elements.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def dropRight(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    val lead = elements drop n
-    breakable {
-      for (x <- this) {
-        if (!lead.hasNext) break
-        lead.next
-        b += x
-      }
-    }
-    b.result
-  }
-
-  /** Returns the longest prefix of this iterable whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def takeWhile(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    breakable {
-      for (x <- this) {
-        if (!p(x)) break
-        b += x
-      }
-    }
-    b.result
-  }
-
-  /** Returns the longest suffix of this iterable whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def dropWhile(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    var go = false
-    for (x <- this) {
-      if (go) b += x
-      else if (!p(x)) { go = true; b += x }
-    }
-    b.result
-  }
-
- /** Returns a pair consisting of the longest prefix of the iterable whose
-   *  elements all satisfy the given predicate, and the rest of the iterable.
-   *
-   *  @param p the test predicate
-   *  @return  a pair consisting of the longest prefix of the iterable whose
-   *           elements all satisfy <code>p</code>, and the rest of the iterable.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def span(p: A => Boolean): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    var toLeft = true
-    for (x <- this) {
-      toLeft = toLeft && p(x)
-      (if (toLeft) l else r) += x
-    }
-    (l.result, r.result)
-  }
-
-  /** Checks if the other iterable object contains the same elements as this one.
-   *
-   *  @note will not terminate for infinite-sized iterables.
-   *  @param that  the other iterable
-   *  @return true, iff both iterables contain the same elements.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def sameElements[B >: A](that: OrderedIterable[B]): Boolean = {
-    val these = this.elements
-    val those = that.elements
-    while (these.hasNext && those.hasNext && these.next() == those.next()) {}
-    !these.hasNext && !those.hasNext
-  }
-}
diff --git a/src/library/scalax/collection/generic/OrderedIterableView.scala b/src/library/scalax/collection/generic/OrderedIterableView.scala
deleted file mode 100755
index 9f0d981f54..0000000000
--- a/src/library/scalax/collection/generic/OrderedIterableView.scala
+++ /dev/null
@@ -1,87 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.generic
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait OrderedIterableView[+UC[/*+*/B] <: Iterable[B], /*+*/A] extends IterableView[UC, A] with OrderedIterable[A] { self =>
-
-  val origin: OrderedIterable[_]
-
-  override def newBuilder[A] = underlying.newBuilder[A].asInstanceOf[Builder[OrderedIterable, A]]
-
-  /** Builds a new view object. This method needs to be overridden in subclasses
-   *  which refine in IterableView type
-   */
-  protected override def newView[B](elems: Iterator[B]) = new OrderedIterableView[UC, B] {
-    val origin = if (self.isDelay) self.origin else self
-    val elements = elems
-  }
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterator[B]): OrderedIterableView[UC, B] = newView(elements ++ that)
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterable[B]): OrderedIterableView[UC, B] = newView(elements ++ that.elements)
-
-  /** Non-strict variant of @see IterableLike.map */
-  override def map[B](f: A => B): OrderedIterableView[UC, B] = newView(elements map f)
-
-  /** Non-strict variant of @see IterableLike.flatMap */
-  override def flatMap[B](f: A => Iterable[B]): OrderedIterableView[UC, B] = newView(elements flatMap (f(_).elements))
-
-  /** Non-strict variant of @see IterableLike.filter */
-  override def filter(p: A => Boolean): OrderedIterableView[UC, A] = newView(elements filter p)
-
-  /** Non-strict variant of @see IterableLike.partition */
-  override def partition(p: A => Boolean): (OrderedIterableView[UC, A], OrderedIterableView[UC, A]) = {
-    val (li, ri) = elements partition p
-    (newView(li), newView(ri))
-  }
-
-  /** Non-strict variant of @see IterableLike.zip */
-  override def zip[B](other: Iterable[B]): OrderedIterableView[UC, (A, B)] = newView(elements zip other.elements)
-
-  /** Non-strict variant of @see IterableLike.zipWithIndex */
-  override def zipWithIndex: OrderedIterableView[UC, (A, Int)] = newView(elements.zipWithIndex)
-
-  /* Non-strict variant of @see IterableLike.zipAll
-   *  This is not enabled because it can't be specialized in VectorView:
-   *  VectorView is not covariant, yet must maintain updatability. Impossible to do this
-   *  with this type signature.
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): OrderedIterableView[UC, (A1, B1)] =
-    newView(elements zipAll (that.elements, thisElem, thatElem))
-   */
-
-  /** Non-strict variant of @see Iterable.take */
-  override def take(n: Int): OrderedIterableView[UC, A] = newView(elements take n)
-
-  /** Non-strict variant of @see Iterable.drop */
-  override def drop(n: Int): OrderedIterableView[UC, A] = newView(elements drop n)
-
-  /** Non-strict variant of @see Iterable.splitAt */
-  override def splitAt(n: Int): (OrderedIterableView[UC, A], OrderedIterableView[UC, A]) = (take(n), drop(n))
-
-  /** Non-strict variant of @see Iterable.slice */
-  override def slice(from: Int, until: Int): OrderedIterableView[UC, A] = newView(elements slice (from, until))
-
-  /** Non-strict variant of @see Iterable.takeWhile */
-  override def takeWhile(p: A => Boolean): OrderedIterableView[UC, A] = newView(elements takeWhile p)
-
-  /** Non-strict variant of @see Iterable.dropWhile */
-  override def dropWhile(p: A => Boolean): OrderedIterableView[UC, A] = newView(elements dropWhile p)
-
-  /** Non-strict variant of @see Iterable.span */
-  override def span(p: A => Boolean): (OrderedIterableView[UC, A], OrderedIterableView[UC, A]) = (takeWhile(p), dropWhile(p))
-}
diff --git a/src/library/scalax/collection/generic/SequenceView.scala b/src/library/scalax/collection/generic/SequenceView.scala
deleted file mode 100755
index 4f70f8a9d8..0000000000
--- a/src/library/scalax/collection/generic/SequenceView.scala
+++ /dev/null
@@ -1,131 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
-
-
-package scalax.collection.generic
-
-import util.control.Breaks._
-import annotation.unchecked.uncheckedVariance
-
-import Sequence._
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait SequenceView[+UC[/*+*/B] <: Sequence[B], /*+*/A] extends IterableView[UC, A] with Sequence[A] {
-self =>
-
-  /** refined from Iterable.View */
-  val origin: Sequence[_]
-
-  override def newBuilder[A] = underlying.newBuilder[A].asInstanceOf[Builder[Sequence, A]]
-
-  trait Transformed[/*+*/B] extends SequenceView[UC, B] {
-    val origin = self
-    protected def asCC = asInstanceOf[SequenceView[UC, B]]
-  }
-
-  class Appended[/*+*/B >: A](that: Sequence[B]) extends Transformed[B] {
-    override def elements: Iterator[B] = self.elements ++ that.elements
-    override def length: Int = self.length + that.length
-    override def apply(idx: Int): B = {
-      val ll = self.length
-      if (idx < ll) self.apply(idx) else that.apply(idx - ll)
-    }
-    override def stringPrefix = self.stringPrefix + "A"
-  }
-
-  class Sliced(from: Int, to: Int) extends Transformed[A] {
-    override def elements: Iterator[A] = self.elements slice (from, to)
-    override lazy val length: Int = ((to min self.length) - (from max 0) min 0)
-    override def apply(idx: Int): A =
-      if (idx >= 0 && idx < length) self.apply(idx + from)
-      else throw new IndexOutOfBoundsException(idx.toString)
-    override def stringPrefix = self.stringPrefix + "S"
-    override def slice(from1: Int, to1: Int) =
-      new self.Sliced(from + (from1 min length max 0) , to + (to1 min length max 0)).asInstanceOf[SequenceView[UC, A]]
-  }
-
-  class Mapped[/*+*/B](f: A => B) extends Transformed[B] {
-    override def elements: Iterator[B] = self.elements map f
-    override def length: Int = self.length
-    override def apply(idx: Int): B = f(self.apply(idx))
-    override def stringPrefix = self.stringPrefix + "M"
-  }
-
-  class Reversed extends Transformed[A] {
-    override def elements: Iterator[A] = self.reversedElements
-    override def length: Int = self.length
-    override def apply(idx: Int): A = self.apply(length - 1 - idx)
-    override def stringPrefix = super.stringPrefix+"R"
-  }
-
-  class Patched[/*+*/B >: A](from: Int, patch: Sequence[B], replaced: Int) extends Transformed[B] {
-    val plen = patch.length
-    override def elements: Iterator[B] = self.elements patch (from, patch, replaced)
-    override def length: Int = self.length + plen - replaced
-    override def apply(idx: Int): B =
-      if (idx < from) self.apply(idx)
-      else if (idx < from + plen) patch.apply(idx - from)
-      else self.apply(idx - plen + replaced)
-    override def stringPrefix = super.stringPrefix+"P"
-  }
-
-  class Zipped[/*+*/B](that: Sequence[B]) extends Transformed[(A, B)] {
-    override def elements: Iterator[(A, B)] = self.elements zip that.elements
-    override def length = self.length min that.length
-    override def apply(idx: Int): (A, B) = (self.apply(idx), that.apply(idx))
-    override def stringPrefix = super.stringPrefix+"Z"
-  }
-
-  override def ++[B >: A](that: Iterable[B]): SequenceView[UC, B] =
-    new Appended[B](that.toSequence).asCC
-  override def ++[B >: A](that: Iterator[B]): SequenceView[UC, B] =
-    new Appended[B](that.toSequence).asCC
-  override def map[B](f: A => B): SequenceView[UC, B] =
-    new Mapped(f).asCC
-  override def reverse: SequenceView[UC, A] =
-    (new Reversed).asCC
-  def patch[B >: A](from: Int, patch: Sequence[B], replaced: Int): SequenceView[UC, B] =
-    if (0 <= from && from < length) new Patched(from, patch, replaced).asCC
-    else throw new IndexOutOfBoundsException(from.toString)
-  override def padTo[B >: A](len: Int, elem: B): SequenceView[UC, B] =
-    patch(length, fill((len - length) max 0)(elem), 0)
-  override def zip[B](that: Iterable[B]): SequenceView[UC, (A, B)] =
-    new Zipped(that.toSequence).asCC
-  override def zipWithIndex: SequenceView[UC, (A, Int)] =
-    zip((0 until length).asInstanceOf[Null]) // !@!
-    /*
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): SequenceView[UC, (A1, B1)] = {
-    val that1 = that.toSequence
-    self.padTo(that1.length, thisElem) zip that1.padTo(this.length, thatElem)//.asInstanceOf[SequenceView[UC, (A1, B1)]]
-  }*/
-  override def take(n: Int): SequenceView[UC, A] =
-    slice(0, n)
-  override def drop(n: Int): SequenceView[UC, A] =
-    slice(n, Math.MAX_INT)
-  override def splitAt(n: Int): (SequenceView[UC, A], SequenceView[UC, A]) = (take(n), drop(n))
-  override def slice(from: Int, until: Int): SequenceView[UC, A] =
-    new Sliced(from, until).asCC
-  override def takeWhile(p: A => Boolean): SequenceView[UC, A] =
-    take(prefixLength(p))
-  override def dropWhile(p: A => Boolean): SequenceView[UC, A] =
-    drop(prefixLength(p))
-  override def span(p: A => Boolean): (SequenceView[UC, A], SequenceView[UC, A]) = {
-    val n = prefixLength(p)
-    (take(n), drop(n))
-  }
-
-  // missing here because we can't do anything about them, so we fall back to default construction
-  // if an IterableView via newView: flatMap, filter, partition
-}
-
diff --git a/src/library/scalax/collection/generic/SetFactory.scala b/src/library/scalax/collection/generic/SetFactory.scala
deleted file mode 100644
index 458d4bbade..0000000000
--- a/src/library/scalax/collection/generic/SetFactory.scala
+++ /dev/null
@@ -1,11 +0,0 @@
-package scalax.collection.generic
-
-trait SetFactory[CC[A] <: SetTemplate[CC, A] with Set[A]] extends IterableFactory[CC] {
-
-  def empty[A]: CC[A]
-
-  def apply[A](elems: A*): CC[A] = empty[A] ++ elems.asInstanceOf[Iterable[A]] // !@!
-
-  override def newBuilder[B]: Builder[CC, B] = new AddableBuilder[CC, B](empty)
-
-}
diff --git a/src/library/scalax/collection/generic/VectorTemplate.scala b/src/library/scalax/collection/generic/VectorTemplate.scala
deleted file mode 100644
index d97fd03aa4..0000000000
--- a/src/library/scalax/collection/generic/VectorTemplate.scala
+++ /dev/null
@@ -1,266 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
-
-package scalax.collection.generic
-
-import Vector._
-
-/** Sequences that support O(1) element access and O(1) length computation.
- *  @author Sean McDirmid
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait VectorTemplate[+CC[/*+*/B] <: VectorTemplate[CC, B] with Vector[B], /*+*/A] extends SequenceTemplate[CC, A] {
-self =>
-
-  // Overridden methods from IterableTemplate
-
-  /** The iterator returned by the elements method
-   */
-  protected class Elements(start: Int, end: Int) extends scalax.collection.BufferedIterator[A] {
-    var i = start
-    def hasNext: Boolean = i < end
-    def next: A =
-      if (i < end) {
-        val x = self(i)
-        i += 1
-        x
-      } else Iterator.empty.next
-    def head =
-      if (i < end) self(i) else Iterator.empty.next
-    /** drop is overridden to enable fast searching in the middle of random access sequences */
-    override def drop(n: Int): Iterator[A] =
-      if (n > 0) new Elements(start + n, end) else this
-    /**  is overridden to be symmetric to drop */
-    override def take(n: Int): Iterator[A] =
-      if (n < 0) Iterator.empty.buffered
-      else if (start + n < end) new Elements(start, start + n)
-      else this
-  }
-
-  override def elements: Iterator[A] = new Elements(0, length)
-
-  override def isEmpty: Boolean = { length == 0 }
-
-  override def foreach(f: A => Unit): Unit = {
-    var i = 0
-    val len = length
-    while (i < len) { f(this(i)); i += 1 }
-  }
-
-  override def forall(p: A => Boolean): Boolean = prefixLength(p(_)) == length
-  override def exists(p: A => Boolean): Boolean = prefixLength(!p(_)) != length
-
-  override def find(p: A => Boolean): Option[A] = {
-    val i = prefixLength(!p(_))
-    if (i < length) Some(this(i)) else None
-  }
-
-  private def foldl[B](start: Int, z: B, op: (B, A) => B): B = {
-    var i = start
-    val len = length
-    var result = z
-    while (i < len) {
-      result = op(result, this(i))
-      i += 1
-    }
-    result
-  }
-
-  private def foldr[B](start: Int, len: Int, z: B, op: (A, B) => B): B =
-    if (start == len) z
-    else op(this(start), foldr(start + 1, len, z, op))
-
-  override def foldLeft[B](z: B)(op: (B, A) => B): B = foldl(0, z, op)
-  override def foldRight[B](z: B)(op: (A, B) => B): B = foldr(0, length, z, op)
-  override def reduceLeft[B >: A](op: (B, A) => B): B =
-    if (length > 0) foldl(0, this(0), op) else super.reduceLeft(op)
-  override def reduceRight[B >: A](op: (A, B) => B): B =
-    if (length > 0) foldr(0, length - 1, this(length - 1), op) else super.reduceRight(op)
-
-  override def zip[B](that: Iterable[B]): CC[(A, B)] = that match {
-    case that: Vector[_] =>
-      var i = 0
-      val len = this.length min that.length
-      val b = this.newBuilder[(A, B)](len)
-      while (i < len) {
-        b += ((this(i), that(i).asInstanceOf[B]))
-        i += 1
-      }
-      b.result
-    case _ =>
-      super.zip(that)
-  }
-
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): CC[(A1, B1)] = that match {
-    case that: Vector[_] =>
-      var i = 0
-      val thisLen = this.length
-      val thatLen = that.length
-      val len = thisLen min thatLen
-      val b = this.newBuilder[(A1, B1)](thisLen max thatLen)
-      while (i < len) {
-        b += ((this(i), that(i).asInstanceOf[B]))
-        i += 1
-      }
-      while (i < this.length) {
-        b += ((this(i), thatElem))
-        i += 1
-      }
-      while (i < that.length) {
-        b += ((this(i), thatElem.asInstanceOf[B]))
-        i += 1
-      }
-      b.result
-    case _ =>
-      super.zipAll(that, thisElem, thatElem)
-  }
-
-  override def zipWithIndex: CC[(A, Int)] = {
-    val len = length
-    val b = newBuilder[(A, Int)](len)
-    var i = 0
-    while (i < len) {
-      b += ((this(i), i))
-      i += 1
-    }
-    b.result
-  }
-
-  override def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
-    var i = 0
-    var j = start
-    val end = length min len min (xs.length - start)
-    while (i < end) {
-      xs(j) = this(i)
-      i += 1
-      j += 1
-    }
-  }
-
-  // Overridden methods from OrderedIterableTemplate
-
-  override def head: A = if (isEmpty) throw new NoSuchElementException else this(0)
-
-  override def slice(from: Int, until: Int): CC[A] = {
-    var i = from max 0
-    val end = until min length
-    val b = newBuilder[A](end - i)
-    while (i < end) {
-      b += this(i)
-      i += 1
-    }
-    b.result
-  }
-
-  override def take(n: Int): CC[A] = slice(0, n)
-  override def drop(n: Int): CC[A] = slice(n, length)
-  override def takeRight(n: Int): CC[A] = slice(length - n, length)
-  override def dropRight(n: Int): CC[A] = slice(0, length - n)
-  override def splitAt(n: Int): (CC[A], CC[A]) = (take(n), drop(n))
-  override def takeWhile(p: A => Boolean): CC[A] = take(prefixLength(p))
-  override def dropWhile(p: A => Boolean): CC[A] = drop(prefixLength(p))
-  override def span(p: A => Boolean): (CC[A], CC[A]) = splitAt(prefixLength(p))
-  override def last: A = if (length > 0) this(length - 1) else super.last
-  override def init: CC[A] = if (length > 0) slice(0, length - 1) else super.init
-
-  override def sameElements[B >: A](that: OrderedIterable[B]): Boolean = that match {
-    case that: Vector[_] =>
-      val len = length
-      len == that.length && {
-        var i = 0
-        while (i < len && this(i) == that(i)) i += 1
-        i == len
-      }
-    case _ =>
-      super.sameElements(that)
-  }
-
-  // Overridden methods from Sequence
-
-  override def lengthCompare(len: Int): Int = length - len
-
-  private def negLength(n: Int) = if (n == length) -1 else n
-
-  override def indexWhere(p: A => Boolean, from: Int): Int =
-    negLength(from + segmentLength(!p(_), from))
-
-  override def lastIndexWhere(p: A => Boolean, end: Int): Int = {
-    var i = end
-    while (i >= 0 && !p(this(i))) i -= 1
-    i
-  }
-
-  override def lastIndexOf[B >: A](elem: B, end: Int): Int = lastIndexWhere(elem ==, end)
-
-  override def reverse: CC[A] = {
-    val b = newBuilder[A](length)
-    var i = length
-    while (0 < i) {
-      i -= 1
-      b += this(i)
-    }
-    b.result
-  }
-
-  override def reversedElements: Iterator[A] = new Iterator[A] {
-    var i = length
-    def hasNext: Boolean = 0 < i
-    def next: A =
-      if (0 < i) {
-        i -= 1
-        self(i)
-      } else Iterator.empty.next
-  }
-
-  override def startsWith[B](that: Sequence[B], offset: Int): Boolean = that match {
-    case that: Vector[_] =>
-      var i = offset
-      var j = 0
-      val thisLen = length
-      val thatLen = that.length
-      while (i < thisLen && j < thatLen && this(i) == that(j)) {
-        i += 1
-        j += 1
-      }
-      j == thatLen
-    case _ =>
-      var i = offset
-      val thisLen = length
-      val thatElems = that.elements
-      while (i < thisLen && thatElems.hasNext && this(i) == thatElems.next) {
-        i += 1
-      }
-      !thatElems.hasNext
-  }
-
-  override def endsWith[B](that: Sequence[B]): Boolean = that match {
-    case that: Vector[_] =>
-      val thisLen = length
-      val thatLen = that.length
-      var i = thisLen - 1
-      var j = thatLen - 1
-      while (i >= 0 && j >= 0 && this(i) == that(j)) {
-        i -= 1
-        j -= 1
-      }
-      j == 0
-    case _ =>
-      super.endsWith(that)
-  }
-
-  override def indexOf[B >: A](that: Sequence[B]): Int = {
-    var i = 0
-    val last = length - that.length
-    while (i <= last && !startsWith(that, i)) i += 1
-    negLength(i)
-  }
-}
-
diff --git a/src/library/scalax/collection/generic/covartest/IterableFactory.scala b/src/library/scalax/collection/generic/covartest/IterableFactory.scala
deleted file mode 100755
index d12da89987..0000000000
--- a/src/library/scalax/collection/generic/covartest/IterableFactory.scala
+++ /dev/null
@@ -1,108 +0,0 @@
-package scalax.collection.generic.covartest
-
-trait IterableFactory[CC[A] <: Iterable[A]] {
-
-  /** Create CC collection of specified elements */
-  def apply[A](args: A*): CC[A]
-
-  protected def newBuilder[A]: Builder[CC, A] =
-    apply().newBuilder[A].asInstanceOf[Builder[CC, A]]
-
-  /** Concatenate all the argument lists into a single list.
-   *
-   *  @param xss the lists that are to be concatenated
-   *  @return the concatenation of all the lists
-   */
-  def concat[A](xss: CC[A]*): CC[A] = {
-    val b = newBuilder[A]
-    for (xs <- xss) b ++= xs
-    b.result
-  }
-
-  /** An iterable that contains the same element a number of times
-   *  @param   n  The number of elements returned
-   *  @param   elem The element returned each time
-   */
-  def fill[A](n: Int, elem: => A): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    while (i < n) {
-      b += elem
-      i += 1
-    }
-    b.result
-  }
-
-  def fill[A](n1: Int, n2: Int, elem: => A): CC[CC[A]] =
-    tabulate(n1)(_ => fill(n2, elem))
-
-  def fill[A](n1: Int, n2: Int, n3: Int, elem: => A): CC[CC[CC[A]]] =
-    tabulate(n1)(_ => fill(n2, n3, elem))
-
-  def tabulate[A](n: Int)(f: Int => A): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    while (i < n) {
-      b += f(i)
-      i += 1
-    }
-    b.result
-  }
-
-  def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): CC[CC[A]] =
-    tabulate(n1)(i1 => tabulate(n2)(i2 => f(i1, i2)))
-
-  def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): CC[CC[CC[A]]] =
-    tabulate(n1)(i1 => tabulate(n2)(i2 => tabulate(n3)(i3 => f(i1, i2, i3))))
-// todo: go up to 5(?)
-
-  /** Create a sequence of increasing integers in a range.
-   *
-   *  @param from the start value of the sequence
-   *  @param end the end value of the sequence
-   *  @return the sorted list of all from `from` (inclusive)
-   *  up to, but exclusding, `end`.
-   */
-  def range[A](start: Int, end: Int): CC[Int] = range(start, end, 1)
-
-  /** Create a sequence of increasing integers in a range.
-   *
-   *  @param from the start value of the sequence
-   *  @param end the end value of the sequence
-   *  @param step the increment value of successive elements
-   *  @return a list of values <code>from + n * step</code> for
-   *          increasing n. If `step > 0` the sequence terminates
-   *          with the largest value less than `end`. If `step < 0`
-   *          the sequence terminates with the smallest value greater than `end`.
-   *          If `step == 0`, the sequence gors on infinitely (in that
-   *          case the `range` operation might not terminate.
-   */
-  def range(start: Int, end: Int, step: Int): CC[Int] = {
-    val b = newBuilder[Int]
-    var i = start
-    while ((step <= 0 || i < end) && (step >= 0 || i > end)) {
-      b += i
-      i += step
-    }
-    b.result
-  }
-
-  /** Create a sequence by repeatedly applying a given function to a start value.
-   *
-   *  @param start the start value of the sequence
-   *  @param len   the length of the sequence
-   *  @param f     the function that's repeatedly applied
-   *  @return      the sequence with elements <code>(start, f(start), f(f(start)), ..., f<sup>len-1</sup>(start))</code>
-   */
-  def iterate(start: Int, len: Int)(f: Int => Int): CC[Int] = {
-    val b = newBuilder[Int]
-    var acc = start
-    var i = 0
-    while (i < len) {
-      b += acc
-      acc = f(acc)
-      i += 1
-    }
-    b.result
-  }
-}
diff --git a/src/library/scalax/collection/generic/covartest/IterableTemplate.scala b/src/library/scalax/collection/generic/covartest/IterableTemplate.scala
deleted file mode 100755
index 791d698a75..0000000000
--- a/src/library/scalax/collection/generic/covartest/IterableTemplate.scala
+++ /dev/null
@@ -1,677 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection.generic.covartest
-
-import scalax.collection.mutable.{Buffer, ArrayBuffer, ListBuffer}
-import scalax.collection.immutable.{List, Nil, ::, Stream}
-import util.control.Breaks._
-import Iterable._
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>Collection</code>.
- *        Only potentially unbounded collections should directly sub-class <code>Iterable</code>.
- *  @author Matthias Zenger
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait IterableTemplate[+CC[+B] <: IterableTemplate[CC, B] with Iterable[B], +A] { self/*: CC[A]*/ =>
-
-  /** The template itself seen as an instance of `CC[A]`.
-   * @note: It would be logical to have a self type `CC[A]` instead, then we would not need
-   * this method. Unfortunately, tyis runs afoul some pecularities in Scala's member resolution
-   * algorithm: If the self type is a CC, then Iterable is one of its supertypes. Iterable
-   * defines a number of concrete methods such as newBuilder which are abstract here.
-   * The newBuilder method in Iterable[A] has type Builder[Iterable, A]. Because Scala
-   * prefers concrete over abstract members, it is this newBuilder which is chosen, instead of
-   * the abstract newBuilder in class IterableTemplate of type Builder[CC, A].
-   * Even for concrete methods we have a problem because the last mixin in the parents of CC is
-   * Iterable, not IterableTemplate. So resolution picks the version in Iterable, which returns
-   * again an Iterable, not a CC, as would be required.
-   * These problems would be avoided if Scala computed the type of a member as the glb of the types
-   * all members in the class and its superclasses types.
-   * I think overall this would be a better design.
-   */
-  protected[this] def thisCC: CC[A] = this.asInstanceOf[CC[A]]
-
-  /** Creates a new iterator over all elements contained in this
-   *  object.
-   *
-   *  @return the new iterator
-   */
-  def elements: Iterator[A]
-
-  /** Create a new builder for this IterableType
-   */
-  def newBuilder[B]: Builder[CC, B]
-
-  /** Create a new builder for this IterableType
-   *  with a hint what that its size should be size `sizeHint`
-   */
-  def newBuilder[B](sizeHint: Int): Builder[CC, B] = newBuilder[B]
-
-  /** Is this collection empty? */
-  def isEmpty: Boolean = !elements.hasNext
-
-  /** returns true iff this collection has a bound size.
-   *  Many APIs in this trait will not work on collections of
-   *  unbound sizes.
-   */
-  def hasDefiniteSize = true
-
-  /** Create a new iterable of type CC which contains all elements of this iterable
-   *  followed by all elements of Iterable `that'
-   */
-  def ++[B >: A](that: Iterable[B]): CC[B] = {
-    val b: Builder[CC, B] = (this: IterableTemplate[CC, A]).newBuilder[B]
-    b ++= thisCC
-    b ++= that
-    b.result
-  }
-
-  /** Create a new iterable of type CC which contains all elements of this iterable
-   *  followed by all elements of Iterator `that'
-   */
-  def ++[B >: A](that: Iterator[B]): CC[B] = {
-    val b = newBuilder[B]
-    b ++= thisCC
-    b ++= that
-    b.result
-  }
-
-  /** Returns the iterable resulting from applying the given function
-   *  <code>f</code> to each element of this iterable.
-   *
-   *  @param f function to apply to each element.
-   *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
-   *           iterable is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  def map[B](f: A => B): CC[B] = {
-    val b = newBuilder[B]
-    for (x <- this) b += f(x)
-    b.result
-  }
-
-  /** Applies the given function <code>f</code> to each element of
-   *  this iterable, then concatenates the results.
-   *
-   *  @param f the function to apply on each element.
-   *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-   *           this iterable is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-   */
-  def flatMap[B](f: A => Iterable[B]): CC[B] = {
-    val b = newBuilder[B]
-    for (x <- this) b ++= f(x)
-    b.result
-  }
-
-  /** Returns all the elements of this iterable that satisfy the
-   *  predicate <code>p</code>. The order of the elements is preserved.
-   *  @param p the predicate used to filter the iterable.
-   *  @return the elements of this iterable satisfying <code>p</code>.
-   */
-  def filter(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    for (x <- this)
-      if (p(x)) b += x
-    b.result
-  }
-
-  /** Removes all elements of the iterable which satisfy the predicate
-   *  <code>p</code>. This is like <code>filter</code> with the
-   *  predicate inversed.
-   *
-   *  @param p the predicate to use to test elements
-   *  @return  the iterable without all elements which satisfy <code>p</code>
-   */
-  def remove(p: A => Boolean): CC[A] = filter(!p(_))
-
-  /** Partitions this iterable in two iterables according to a predicate.
-   *
-   *  @param p the predicate on which to partition
-   *  @return  a pair of iterables: the iterable that satisfies the predicate
-   *           <code>p</code> and the iterable that does not.
-   *           The relative order of the elements in the resulting iterables
-   *           is the same as in the original iterable.
-   */
-  def partition(p: A => Boolean): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    for (x <- this) (if (p(x)) l else r) += x
-    (l.result, r.result)
-  }
-
-  /** Apply a function <code>f</code> to all elements of this
-   *  iterable object.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  f   a function that is applied to every element.
-   *  Note this function underlies the implementation of most other bulk operations.
-   *  It should be overridden in concrete collectionc classes with efficient implementations.
-   */
-  def foreach(f: A => Unit): Unit = elements.foreach(f)
-
-  /** Return true iff the given predicate `p` yields true for all elements
-   *  of this iterable.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   */
-  def forall(p: A => Boolean): Boolean = {
-    var result = true
-    breakable {
-      for (x <- this)
-        if (!p(x)) { result = false; break }
-    }
-    result
-  }
-
-  /** Return true iff there is an element in this iterable for which the
-   *  given predicate `p` yields true.
-   *
-   *  @note May not terminate for infinite-sized collections.
-   *  @param   p     the predicate
-   */
-  def exists(p: A => Boolean): Boolean = {
-    var result = false
-    breakable {
-      for (x <- this)
-        if (p(x)) { result = true; break }
-    }
-    result
-  }
-
-  /** Count the number of elements in the iterable which satisfy a predicate.
-   *
-   *  @param p the predicate for which to count
-   *  @return  the number of elements satisfying the predicate <code>p</code>.
-   */
-  def count(p: A => Boolean): Int = {
-    var cnt = 0
-    for (x <- this) {
-      if (p(x)) cnt += 1
-    }
-    cnt
-  }
-
-  /** Find and return the first element of the iterable object satisfying a
-   *  predicate, if any.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param p the predicate
-   *  @return an option containing the first element in the iterable object
-   *  satisfying <code>p</code>, or <code>None</code> if none exists.
-   */
-  def find(p: A => Boolean): Option[A] = {
-    var result: Option[A] = None
-    breakable {
-      for (x <- this)
-        if (p(x)) { result = Some(x); break }
-    }
-    result
-  }
-
-  /** Combines the elements of this iterable object together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the iterable is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  def foldLeft[B](z: B)(op: (B, A) => B): B = {
-    var result = z
-    for (x <- this)
-      result = op(result, x)
-    result
-  }
-
-  /** Combines the elements of this iterable together using the binary
-   *  function <code>f</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the iterable is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  def foldRight[B](z: B)(op: (A, B) => B): B = elements.foldRight(z)(op)
-
-  /** Similar to <code>foldLeft</code> but can be used as
-   *  an operator with the order of iterable and zero arguments reversed.
-   *  That is, <code>z /: xs</code> is the same as <code>xs foldLeft z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   */
-  def /: [B](z: B)(op: (B, A) => B): B = foldLeft(z)(op)
-
-  /** An alias for <code>foldRight</code>.
-   *  That is, <code>xs :\ z</code> is the same as <code>xs foldRight z</code>
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   */
-  def :\ [B](z: B)(op: (A, B) => B): B = foldRight(z)(op)
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the iterable object has elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the iterable object is empty.
-   */
-  def reduceLeft[B >: A](op: (B, A) => B): B = {
-    if (isEmpty) throw new UnsupportedOperationException("empty.reduceLeft")
-    var result: B = elements.next
-    var first = true
-    for (x <- this)
-      if (first) first = false
-      else result = op(result, x)
-    result
-  }
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @note Will not terminate for infinite-sized collections.
-   *  @note Might return different results for different runs, unless this iterable is ordered, or
-   *        the operator is associative and commutative.
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   *
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  def reduceRight[B >: A](op: (A, B) => B): B =
-    elements.reduceRight(op)
-
-  /** Returns an iterable formed from this iterable and the specified iterable
-   *  `other` by associating each element of the former with
-   *  the element at the same position in the latter.
-   *  If one of the two iterables is longer than the other, its remaining elements are ignored.
-   */
-  def zip[B](that: Iterable[B]): CC[(A, B)] = {
-    val these = this.elements
-    val those = that.elements
-    val b = this.newBuilder[(A, B)]
-    while (these.hasNext && those.hasNext)
-      b += ((these.next, those.next))
-    b.result
-  }
-
-  /** Returns a iterable formed from this iterable and the specified iterable
-   *  <code>that</code> by associating each element of the former with
-   *  the element at the same position in the latter.
-   *
-   *  @param that     iterable <code>that</code> may have a different length
-   *                  as the self iterable.
-   *  @param thisElem element <code>thisElem</code> is used to fill up the
-   *                  resulting iterable if the self iterable is shorter than
-   *                  <code>that</code>
-b   *  @param thatElem element <code>thatElem</code> is used to fill up the
-   *                  resulting iterable if <code>that</code> is shorter than
-   *                  the self iterable
-   *  @return         <code>Iterable((a<sub>0</sub>,b<sub>0</sub>), ...,
-   *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
-   *                  ..., {elem,b<sub>m</sub>})</code>
-   *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
-   *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
-   *                  invoked where <code>m &gt; n</code>.
-   */
-  def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): CC[(A1, B1)] = {
-    val these = this.elements
-    val those = that.elements
-    val b = newBuilder[(A1, B1)]
-    while (these.hasNext && those.hasNext)
-      b += ((these.next, those.next))
-    while (these.hasNext)
-      b += ((these.next, thatElem))
-    while (those.hasNext)
-      b += ((thisElem, those.next))
-    b.result
-  }
-
-  /** Zips this iterable with its indices. `s.zipWithIndex` is equivalent to
-   *  `s zip s.indices`, but is usually more efficient.
-   */
-  def zipWithIndex: CC[(A, Int)] = {
-    val b = newBuilder[(A, Int)]
-    var i = 0
-    for (x <- this) {
-      b += ((x, i))
-      i +=1
-    }
-    b.result
-  }
-
-  /** Copy all elements to a given buffer
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  dest   The buffer to which elements are copied
-   */
-  def copyToBuffer[B >: A](dest: Buffer[B]) {
-    for (x <- this) dest += x
-  }
-
-  /** Fills the given array <code>xs</code> with at most `len` elements of
-   *  this iterable starting at position `start`.
-   *  Copying will stop oce either the end of the current iterable is reached or
-   *  `len` elements have been copied.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @param  len number of elements to copy
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
-    var i = start
-    val end = (start + len) min xs.length
-    for (x <- this) {
-      if (i < end) {
-        xs(i) = x
-        i += 1
-      }
-    }
-  }
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this iterable starting at position <code>start</code>
-   *  until either the end of the current iterable or the end of array `xs` is reached.
-   *
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  def copyToArray[B >: A](xs: Array[B], start: Int) {
-    copyToArray(xs, start, xs.length - start)
-  }
-
-  /** Converts this collection to a fresh Array elements.
-   *  @note  Will not terminate for infinite-sized collections.
-   */
-  def toArray[B >: A]: Array[B] = {
-    var size = 0
-    for (x <- this) size += 1
-    val result = new Array[B](size)
-    copyToArray(result, 0)
-    result
-  }
-
-  /**
-   *  Create a fresh list with all the elements of this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toList: List[A] = (new ListBuffer[A] ++ thisCC).toList
-
-  /**
-   *  Returns a sequence containing all of the elements in this iterable object.
-   *  @note Will not terminate for infinite-sized collections.
-   */
-  def toSequence: Sequence[A] = toList
-
-  /** @deprecated use toSequence instead
-   */
-  @deprecated def toSeq: Sequence[A] = toSequence
-
-  /**
-   *  Create a stream which contains all the elements of this iterable object.
-   *  @note consider using <code>projection</code> for lazy behavior.
-   */
-  def toStream: Stream[A] = elements.toStream
-
-  /** Sort the iterable according to the comparison function
-   *  <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>,
-   *  which should be true iff <code>e1</code> is smaller than
-   *  <code>e2</code>.
-   *  The sort is stable. That is elements that are equal wrt `lt` appear in the
-   *  same order in the sorted iterable as in the original.
-   *
-   *  @param lt the comparison function
-   *  @return   a iterable sorted according to the comparison function
-   *            <code>&lt;(e1: a, e2: a) =&gt; Boolean</code>.
-   *  @ex <pre>
-   *    List("Steve", "Tom", "John", "Bob")
-   *      .sort((e1, e2) => (e1 compareTo e2) &lt; 0) =
-   *    List("Bob", "John", "Steve", "Tom")</pre>
-   *  !!!
-  def sortWith(lt : (A,A) => Boolean): CC[A] = {
-    val arr = toArray
-    Array.sortWith(arr, lt)
-    val b = newBuilder[A]
-    for (x <- arr) b += x
-    b.result
-  }
-  */
-
-  /** Returns a string representation of this iterable object. The resulting string
-   *  begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   *
-   *  @ex  <code>List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"</code>
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(start: String, sep: String, end: String): String =
-    addString(new StringBuilder(), start, sep, end).toString
-
-  /** Returns a string representation of this iterable object. The string
-   *  representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   *
-   *  @param sep separator string.
-   *  @return a string representation of this iterable object.
-   */
-  def mkString(sep: String): String =
-    addString(new StringBuilder(), sep).toString
-
-  /** Converts a collection into a flat <code>String</code> by each element's toString method.
-   */
-  def mkString =
-    addString(new StringBuilder()).toString
-
-  /** Write all elements of this iterable into given string builder.
-   *  The written text begins with the string <code>start</code> and is finished by the string
-   *  <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *  the method <code>toString()</code>) are separated by the string
-   *  <code>sep</code>.
-   */
-  def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
-    b append start
-    var first = true
-    for (x <- this) {
-      if (first) first = false
-      else b append sep
-      b append x
-    }
-    b append end
-  }
-
-  /** Write all elements of this string into given string builder.
-   *  The string representations of elements (w.r.t. the method <code>toString()</code>)
-   *  are separated by the string <code>sep</code>.
-   */
-  def addString(b: StringBuilder, sep: String): StringBuilder = addString(b, "", sep, "")
-
-  /** Write all elements of this string into given string builder without using
-   *  any separator between consecutive elements.
-   */
-  def addString(b: StringBuilder): StringBuilder = addString(b, "")
-
-  /**
-   * returns a projection that can be used to call non-strict <code>filter</code>,
-   * <code>map</code>, and <code>flatMap</code> methods that build projections
-   * of the collection.
-  def projection : Iterable.Projection[A] = new Iterable.Projection[A] {
-    def elements = Iterable.this.elements
-    override def force = Iterable.this
-  }
-   */
-
-  override def toString = mkString(stringPrefix + "(", ", ", ")")
-
-  /** Defines the prefix of this object's <code>toString</code> representation.
-   */
-  def stringPrefix : String = {
-    var string = this.getClass.getName
-    val idx1 = string.lastIndexOf('.' : Int)
-    if (idx1 != -1) string = string.substring(idx1 + 1)
-    val idx2 = string.indexOf('$')
-    if (idx2 != -1) string = string.substring(0, idx2)
-    string
-  }
-
-  /** Creates a view of this iterable @see IterableView
-   */
-  def view: IterableView[CC, A] = new IterableView[CC, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin = thisCC
-    val elements: Iterator[A] = self.elements
-  }
-
-// The following methods return non-deterministic results, unless this iterable is an OrderedIterable
-
-  /** The first element of this iterable.
-   *
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   *  @throws Predef.NoSuchElementException if the iterable is empty.
-   */
-  def head: A = if (isEmpty) throw new NoSuchElementException else elements.next
-
-   /** @deprecated  use head instead */
-  @deprecated def first: A = head
-
-  /** Returns as an option the first element of this iterable
-   *  or <code>None</code> if iterable is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def headOption: Option[A] = if (isEmpty) None else Some(head)
-
-  /** @deprecated use headOption instead
-   *  <code>None</code> if iterable is empty.
-   */
-  @deprecated def firstOption: Option[A] = headOption
-
-  /** An iterable consisting of all elements of this iterable
-   *  except the first one.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def tail: CC[A] = drop(1)
-
-  /** Return an iterable consisting only of the first <code>n</code>
-   *  elements of this iterable, or else the whole iterable, if it has less
-   *  than <code>n</code> elements.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def take(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    breakable {
-      for (x <- this) {
-        b += x
-        i += 1
-        if (i == n) break
-      }
-    }
-    b.result
-  }
-
-  /** Returns this iterable without its <code>n</code> first elements
-   *  If this iterable has less than <code>n</code> elements, the empty
-   *  iterable is returned.
-   *
-   *  @param n the number of elements to drop
-   *  @return  the new iterable
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def drop(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    for (x <- this) {
-      if (i >= n) b += x
-      i += 1
-    }
-    b.result
-  }
-
-  /** A sub-iterable starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @note c.slice(from, to)  is equivalent to (but possibly more efficient than)
-   *  c.drop(from).take(to - from)
-   *
-   *  @param from   The index of the first element of the returned subsequence
-   *  @param until  The index of the element following the returned subsequence
-   *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-   *          or <code>length &lt; from + len<code>
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def slice(from: Int, until: Int): CC[A] = {
-    val b = newBuilder[A]
-    var i = 0
-    breakable {
-      for (x <- this) {
-        if (i >= from) b += x
-        i += 1
-        if (i == until) break
-      }
-    }
-    b.result
-  }
-
-  /** Split the iterable at a given point and return the two parts thus
-   *  created.
-   *
-   *  @param n the position at which to split
-   *  @return  a pair of iterables composed of the first <code>n</code>
-   *           elements, and the other elements.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def splitAt(n: Int): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    var i = 0
-    for (x <- this)
-      (if (i < n) l else r) += x
-    (l.result, r.result)
-  }
-
-  /** A sub-iterable view  starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until  The index of the element following the slice
-   *  @note  The difference between `view` and `slice` is that `view` produces
-   *         a view of the current iterable, whereas `slice` produces a new iterable.
-   *
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   *  @note view(from, to)  is equivalent to view.slice(from, to)
-   */
-  def view(from: Int, until: Int): IterableView[CC, A] = view.slice(from, until)
-}
diff --git a/src/library/scalax/collection/generic/covartest/IterableView.scala b/src/library/scalax/collection/generic/covartest/IterableView.scala
deleted file mode 100755
index 43a1f68dc0..0000000000
--- a/src/library/scalax/collection/generic/covartest/IterableView.scala
+++ /dev/null
@@ -1,112 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.generic.covartest
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait IterableView[+UC[+B] <: Iterable[B], +A] extends Iterable[A] { self =>
-
-  val origin: Iterable[_]
-  def elements: Iterator[A]
-
-  val underlying: Iterable[_] = origin match {
-    case v: IterableView[t, _] => v.underlying
-    case _ => origin
-  }
-
-  protected def isDelay = elements eq underlying.elements
-
-  private[this] var forced: UC[A] = _
-  private[this] var wasForced = false
-
-  def force: UC[A] = {
-    if (!wasForced) {
-      forced = {
-        val b = underlying.newBuilder[A]
-        for (x <- elements)
-          b += x
-        b.result
-      }.asInstanceOf[UC[A]]
-      wasForced = true
-    }
-    forced
-  }
-
-  def newBuilder[A] = underlying.newBuilder[A]
-
-  /** Builds a new view object. This method needs to be overridden in subclasses
-   *  which refine in IterableView type
-   */
-  protected def newView[B](elems: Iterator[B]) = new IterableView[UC, B] {
-    val origin = if (self.isDelay) self.origin else self
-    val elements = elems
-  }
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterator[B]): IterableView[UC, B] = newView(elements ++ that)
-
-  /** Non-strict variant of @see IterableLike.++ */
-  override def ++[B >: A](that: Iterable[B]): IterableView[UC, B] = newView(elements ++ that.elements)
-
-  /** Non-strict variant of @see IterableLike.map */
-  override def map[B](f: A => B): IterableView[UC, B] = newView(elements map f)
-
-  /** Non-strict variant of @see IterableLike.flatMap */
-  override def flatMap[B](f: A => Iterable[B]): IterableView[UC, B] = newView(elements flatMap (f(_).elements))
-
-  /** Non-strict variant of @see IterableLike.filter */
-  override def filter(p: A => Boolean): IterableView[UC, A] = newView(elements filter p)
-
-  /** Non-strict variant of @see IterableLike.partition */
-  override def partition(p: A => Boolean): (IterableView[UC, A], IterableView[UC, A]) = {
-    val (li, ri) = elements partition p
-    (newView(li), newView(ri))
-  }
-
-  /** Non-strict variant of @see IterableLike.zip */
-  override def zip[B](other: Iterable[B]): IterableView[UC, (A, B)] = newView(elements zip other.elements)
-
-  /** Non-strict variant of @see IterableLike.zipWithIndex */
-  override def zipWithIndex: IterableView[UC, (A, Int)] = newView(elements.zipWithIndex)
-
-  /* Non-strict variant of @see IterableLike.zipAll
-   *  This is not enabled because it can't be specialized in VectorView:
-   *  VectorView is not covariant, yet must maintain updatability. Impossible to do this
-   *  with this type signature.
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): IterableView[UC, (A1, B1)] =
-    newView(elements zipAll (that.elements, thisElem, thatElem))
-   */
-
-  /** Non-strict variant of @see Iterable.take */
-  override def take(n: Int): IterableView[UC, A] = newView(elements take n)
-
-  /** Non-strict variant of @see Iterable.drop */
-  override def drop(n: Int): IterableView[UC, A] = newView(elements drop n)
-
-  /** Non-strict variant of @see Iterable.splitAt */
-  override def splitAt(n: Int): (IterableView[UC, A], IterableView[UC, A]) = (take(n), drop(n))
-
-  /** Non-strict variant of @see Iterable.slice */
-  override def slice(from: Int, until: Int): IterableView[UC, A] = newView(elements slice (from, until))
-
-  /** The projection resulting from the concatenation of this projection with the <code>rest</code> projection.
-   *  @param rest   The projection that gets appended to this projection
-   *  @deprecated   Use ++ instead
-   */
-  @deprecated def append[B >: A](rest : => Iterable[B]): IterableView[UC, B] = this ++ rest.elements
-
-  override def stringPrefix = origin.stringPrefix+"V"
-
-
-}
diff --git a/src/library/scalax/collection/generic/covartest/OrderedIterableForwarder.scala b/src/library/scalax/collection/generic/covartest/OrderedIterableForwarder.scala
deleted file mode 100755
index 3a33dc6694..0000000000
--- a/src/library/scalax/collection/generic/covartest/OrderedIterableForwarder.scala
+++ /dev/null
@@ -1,37 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: IterableProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
-
-
-package scalax.collection.generic.covartest
-
-/** This trait implements a forwarder for iterable objects. It forwards
- *  all calls to a different iterable object, except for
- *
- *    - toString, hashCode, equals, stringPrefix
- *    - newBuilder, view
- *    - all calls creating a new iterable object of the same kind
- *
- *  The above methods are forwarded by subclass IterableProxy
- *
- *  @author  Martin Odersky
- *  @version 2.8
- */
-trait OrderedIterableForwarder[+A] extends OrderedIterable[A] with IterableForwarder[A] {
-
-  /** The iterable object to which calls are forwarded */
-  protected def underlying: OrderedIterable[A]
-
-  // Iterable delegates
-  // Iterable methods could be printed by  cat IterableTemplate.scala | sed -n '/trait Iterable/,$ p' | egrep '^  (override )?def'
-
-  override def last: A = underlying.last
-  override def lastOption: Option[A] = underlying.lastOption
-  override def sameElements[B >: A](that: OrderedIterable[B]): Boolean = underlying.sameElements(that)
-}
diff --git a/src/library/scalax/collection/generic/covartest/OrderedIterableTemplate.scala b/src/library/scalax/collection/generic/covartest/OrderedIterableTemplate.scala
deleted file mode 100755
index f3c509887c..0000000000
--- a/src/library/scalax/collection/generic/covartest/OrderedIterableTemplate.scala
+++ /dev/null
@@ -1,161 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-
-package scalax.collection.generic.covartest
-
-import OrderedIterable._
-
-import util.control.Breaks._
-
-/** Ordered iterables are iterables where the `elements` method always returns elements in the same
- *  order (namely the order in which elements were appended to the iterable). In particular, one has
- *  for every two ordered iterables `xs` and `ys`:
- *
- *  `(xs ++ ys).elements = xs.elements ++ ys.elements
- */
-trait OrderedIterableTemplate[+CC[+B] <: OrderedIterableTemplate[CC, B] with OrderedIterable[B], +A]
-  extends IterableTemplate[CC, A] {
-
-  /** The last element of this iterable.
-   *
-   *  @throws Predef.NoSuchElementException if the iterable is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def last: A = {
-    var lst = head
-    for (x <- this)
-      lst = x
-    lst
-  }
-
-  /** Returns as an option the last element of this iterable or
-   *  <code>None</code> if iterable is empty.
-   *
-   *  @return the last element as an option.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def lastOption: Option[A] = if (isEmpty) None else Some(last)
-
-  /** An iterable consisting of all elements of this iterable except the last one.
-   *  @throws Predef.UnsupportedOperationException if the stream is empty.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def init: CC[A] = {
-    if (isEmpty) throw new UnsupportedOperationException("empty.init")
-    var lst = head
-    val b = newBuilder[A]
-    for (x <- this) {
-      b += lst
-      lst = x
-    }
-    b.result
-  }
-
-  /** Returns the rightmost <code>n</code> elements from this iterable.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def takeRight(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    val lead = elements drop n
-    var go = false
-    for (x <- this) {
-      if (go) b += x
-      else if (lead.hasNext) lead.next
-      else go = true
-    }
-    b.result
-  }
-
-  /** Returns the iterable wihtout its rightmost <code>n</code> elements.
-   *
-   *  @param n the number of elements to take
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def dropRight(n: Int): CC[A] = {
-    val b = newBuilder[A]
-    val lead = elements drop n
-    breakable {
-      for (x <- this) {
-        if (!lead.hasNext) break
-        lead.next
-        b += x
-      }
-    }
-    b.result
-  }
-
-  /** Returns the longest prefix of this iterable whose elements satisfy
-   *  the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def takeWhile(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    breakable {
-      for (x <- this) {
-        if (!p(x)) break
-        b += x
-      }
-    }
-    b.result
-  }
-
-  /** Returns the longest suffix of this iterable whose first element
-   *  does not satisfy the predicate <code>p</code>.
-   *
-   *  @param p the test predicate.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def dropWhile(p: A => Boolean): CC[A] = {
-    val b = newBuilder[A]
-    var go = false
-    for (x <- this) {
-      if (go) b += x
-      else if (!p(x)) { go = true; b += x }
-    }
-    b.result
-  }
-
- /** Returns a pair consisting of the longest prefix of the iterable whose
-   *  elements all satisfy the given predicate, and the rest of the iterable.
-   *
-   *  @param p the test predicate
-   *  @return  a pair consisting of the longest prefix of the iterable whose
-   *           elements all satisfy <code>p</code>, and the rest of the iterable.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def span(p: A => Boolean): (CC[A], CC[A]) = {
-    val l, r = newBuilder[A]
-    var toLeft = true
-    for (x <- this) {
-      toLeft = toLeft && p(x)
-      (if (toLeft) l else r) += x
-    }
-    (l.result, r.result)
-  }
-
-  /** Checks if the other iterable object contains the same elements as this one.
-   *
-   *  @note will not terminate for infinite-sized iterables.
-   *  @param that  the other iterable
-   *  @return true, iff both iterables contain the same elements.
-   *  @note  Might return different results for different runs, unless this iterable is ordered
-   */
-  def sameElements[B >: A](that: OrderedIterable[B]): Boolean = {
-    val these = this.elements
-    val those = that.elements
-    while (these.hasNext && those.hasNext && these.next() == those.next()) {}
-    !these.hasNext && !those.hasNext
-  }
-}
diff --git a/src/library/scalax/collection/generic/covartest/SequenceFactory.scala b/src/library/scalax/collection/generic/covartest/SequenceFactory.scala
deleted file mode 100755
index eb6c093bff..0000000000
--- a/src/library/scalax/collection/generic/covartest/SequenceFactory.scala
+++ /dev/null
@@ -1,11 +0,0 @@
-package scalax.collection.generic.covartest
-
-trait SequenceFactory[CC[A] <: Sequence[A]] extends IterableFactory[CC] {
-
-  /** This method is called in a pattern match { case Sequence(...) => }.
-   *
-   *  @param x the selector value
-   *  @return  sequence wrapped in an option, if this is a Sequence, otherwise none
-   */
-  def unapplySeq[A](x: CC[A]): Some[CC[A]] = Some(x)
-}
diff --git a/src/library/scalax/collection/generic/covartest/SequenceForwarder.scala b/src/library/scalax/collection/generic/covartest/SequenceForwarder.scala
deleted file mode 100644
index 47c512545d..0000000000
--- a/src/library/scalax/collection/generic/covartest/SequenceForwarder.scala
+++ /dev/null
@@ -1,50 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: SeqProxy.scala 15458 2008-06-28 20:23:22Z stepancheg $
-
-
-package scalax.collection.generic.covartest
-
-/** This class implements a forwarder for sequences. It forwards
- *  all calls to a different sequence object except for
- *
- *    - toString, hashCode, equals, stringPrefix
- *    - newBuilder, view, toSequence
- *    - all calls creating a new iterable objetc of the same kind
- *
- *  The above methods are forwarded by subclass SequenceProxy
- *
- *  @author  Martin Odersky
- *  @version 2.8
- */
-trait SequenceForwarder[+A] extends Sequence[A] with OrderedIterableForwarder[A] {
-
-  protected override def underlying: Sequence[A]
-
-  // PartialFunction delegates
-
-  override def apply(i: Int): A = underlying.apply(i)
-  override def isDefinedAt(x: Int): Boolean = underlying.isDefinedAt(x)
-
-  // Sequence delegates
-  // Sequence methods could be printed by  cat SequenceTemplate.scala | sed -n '/trait Seq/,$ p' | egrep '^  (override )?def'
-
-  override def length: Int = underlying.length
-  override def lengthCompare(l: Int) = underlying lengthCompare l
-  override def segmentLength(p: A => Boolean, from: Int): Int = underlying.segmentLength(p, from)
-  override def prefixLength(p: A => Boolean) = underlying.prefixLength(p)
-  override def indexWhere(p: A => Boolean, from: Int): Int = underlying.indexWhere(p, from)
-  override def indexOf[B >: A](elem: B, from: Int): Int = underlying.indexOf(elem, from)
-  override def reversedElements: Iterator[A] = underlying.reversedElements
-  override def startsWith[B](that: Sequence[B], offset: Int): Boolean = underlying.startsWith(that, offset)
-  override def endsWith[B](that: Sequence[B]): Boolean = underlying.endsWith(that)
-  override def indexOf[B >: A](that: Sequence[B]): Int = underlying.indexOf(that)
-  override def contains(elem: Any): Boolean = underlying.contains(elem)
-  override def indices: Range = underlying.indices
-}
diff --git a/src/library/scalax/collection/generic/covartest/SequenceTemplate.scala b/src/library/scalax/collection/generic/covartest/SequenceTemplate.scala
deleted file mode 100755
index eab7904af8..0000000000
--- a/src/library/scalax/collection/generic/covartest/SequenceTemplate.scala
+++ /dev/null
@@ -1,382 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
-
-
-package scalax.collection.generic.covartest
-
-import util.control.Breaks._
-import scalax.collection.immutable.{List, Nil, ::}
-
-import Sequence._
-
-trait SequenceTemplate[+CC[+B] <: SequenceTemplate[CC, B] with Sequence[B], +A] extends PartialFunction[Int, A] with OrderedIterableTemplate[CC, A] {
-self /*: CC[A]*/ =>
-
-  /** Returns the length of the sequence.
-   *
-   *  @return the sequence length.
-   */
-  def length: Int
-
-  /** Result of comparing <code>length</code> with operand <code>len</code>.
-   *  returns <code>x</code> where
-   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; len</code>
-   *  <code>x == 0</code>   iff    <code>this.length == len</code>
-   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; len</code>.
-   *
-   *  The method as implemented here does not call length directly; its running time
-   *  is O(length min len) instead of O(length). The method should be overwritten
-   *  if computing length is cheap.
-   */
-  def lengthCompare(len: Int): Int =  {
-    var i = 0
-    breakable {
-      for (_ <- this) {
-        i += 1
-        if (i > len) break
-      }
-    }
-    i - len
-  }
-
-  /** Should always be <code>length</code> */
-  def size = length
-
-  /** Is this partial function defined for the index <code>x</code>?
-   */
-  def isDefinedAt(x: Int): Boolean = (x >= 0) && (x < length)
-
-  /** Returns index of the first element satisying a predicate, or -1, if none exists.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   */
-  def indexWhere(p: A => Boolean): Int = indexWhere(p, 0)
-
-  /** Returns length of longest segment starting from a start index `from`
-   *  such that every element of the segment satisfies predicate `p`.
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @param  from  the start index
-   */
-  def segmentLength(p: A => Boolean, from: Int): Int = {
-    var result = 0
-    var i = from
-    breakable {
-      for (x <- this) {
-        if (i >= from && !p(x)) { result = i - from; break }
-        else i += 1
-      }
-    }
-    result
-  }
-
-  /** Returns length of longest prefix of this seqence
-   *  such that every element of the prefix satisfies predicate `p`.
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   */
-  def prefixLength(p: A => Boolean) = segmentLength(p, 0)
-
-  /** Returns index of the first element starting from a start index
-   *  satisying a predicate, or -1, if none exists.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @param  from  the start index
-   */
-  def indexWhere(p: A => Boolean, from: Int): Int = {
-    var result = -1
-    var i = from
-    breakable {
-      for (x <- this) {
-        if (i >= from && p(x)) { result = i; break }
-        else i += 1
-      }
-    }
-    result
-  }
-
-  /** Returns index of the first element satisying a predicate, or -1.
-   *
-   *  @deprecated  Use `indexWhere` instead
-   */
-  @deprecated def findIndexOf(p: A => Boolean): Int = indexWhere(p)
-
-  /** Returns the index of the first occurence of the specified
-   *  object in this iterable object.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  elem  element to search for.
-   *  @return the index in this sequence of the first occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   */
-  def indexOf[B >: A](elem: B): Int = indexOf(elem, 0)
-
-  /** Returns the index of the first occurence of the specified
-   *  object in this iterable object,  starting from a start index, or
-   *  -1, if none exists.
-   *
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  elem  element to search for.
-   */
-  def indexOf[B >: A](elem: B, from: Int): Int = indexWhere(elem ==, from)
-
- /** Returns the index of the last occurence of the specified element
-   *  in this sequence, or -1 if the sequence does not contain this element.
-   *
-   *  @param  elem   element to search for.
-   *  @return the index in this sequence of the last occurence of the
-   *          specified element, or -1 if the sequence does not contain
-   *          this element.
-   */
-  def lastIndexOf[B >: A](elem: B): Int = lastIndexOf(elem, length - 1)
-
-  /** Returns the index of the last
-    *  occurence of the specified element in this sequence
-    *  before or at a given end index,
-    *  or -1 if the sequence does not contain this element.
-    *
-    *  @param  elem   element to search for.
-    *  @param  end    the end index
-    */
-  def lastIndexOf[B >: A](elem: B, end: Int): Int = {
-    var i = end
-    val it = reversedElements
-    while (it.hasNext && it.next != elem) i -= 1
-    i
-  }
-
-  /** Returns index of the last element satisying a predicate, or -1, if none exists.
-   *
-   *  @param  p the predicate
-   *  @return   the index of the last element satisfying <code>p</code>,
-   *            or -1 if such an element does not exist
-   */
-  def lastIndexWhere(p: A => Boolean): Int = lastIndexWhere(p, length - 1)
-
-  /** Returns index of the last element not exceeding a given end index
-   *  and satisying a predicate, or -1 if none exists.
-   *
-   *  @param  end the end index
-   *  @param  p the predicate
-   */
-  def lastIndexWhere(p: A => Boolean, end: Int): Int = {
-    var i = end
-    val it = reversedElements
-    while (it.hasNext && (i > end || !p(it.next))) i -= 1
-    i
-  }
-
-  /** A sequence of type <code>C</code> consisting of all elements of
-   *  this sequence in reverse order.
-   *  @note  the operation is implemented by building a new sequence
-   *         from <code>this(length - 1), ..., this(0)</code>
-   *  If random access is inefficient for the given sequence implementation,
-   *  this operation should be overridden.
-   */
-  def reverse: CC[A] = {
-    var xs: List[A] = List()
-    for (x <- this)
-      xs = x :: xs
-    val b = newBuilder[A]
-    for (x <- xs)
-      b += x
-    b.result
-  }
-
-  /** The elements of this sequence in reversed order
-   */
-  def reversedElements: Iterator[A] = reverse.elements
-
-  /**
-   * Checks whether the argument sequence is contained at the
-   * specified index within the receiver object.
-   *
-   * If the both the receiver object, <code>this</code> and
-   * the argument, <code>that</code> are infinite sequences
-   * this method may not terminate.
-   *
-   * @return true if <code>that</code> is contained in
-   * <code>this</code>, at the specified index, otherwise false
-   *
-   * @see String.startsWith
-   */
-  def startsWith[B](that: Sequence[B], offset: Int): Boolean = {
-    val i = elements.drop(offset)
-    val j = that.elements
-    while (j.hasNext && i.hasNext && i.next == j.next) {}
-    !j.hasNext
-  }
-
-  /**
-   * Check whether the receiver object starts with the argument sequence.
-   *
-   * @return true if <code>that</code> is a prefix of <code>this</code>,
-   * otherwise false
-   *
-   * @see Sequence.startsWith
-   */
-  def startsWith[B](that: Sequence[B]): Boolean = startsWith(that, 0)
-
-  /** @return true if this sequence end with that sequence
-   *  @see String.endsWith
-   */
-  def endsWith[B](that: Sequence[B]): Boolean = {
-    val i = this.elements.drop(length - that.length)
-    val j = that.elements
-    while (i.hasNext && j.hasNext && i.next == j.next) ()
-    !j.hasNext
-  }
-
-  /** @return -1 if <code>that</code> not contained in this, otherwise the
-   *  index where <code>that</code> is contained
-   *  @see String.indexOf
-   */
-  def indexOf[B >: A](that: Sequence[B]): Int = {
-    var i = 0
-    var s: Sequence[A] = thisCC
-    while (!s.isEmpty && !(s startsWith that)) {
-      i += 1
-      s = s drop 1
-    }
-    if (!s.isEmpty || that.isEmpty) i else -1
-  }
-
-  /** Tests if the given value <code>elem</code> is a member of this
-   *  sequence.
-   *
-   *  @param elem element whose membership has to be tested.
-   *  @return     <code>true</code> iff there is an element of this sequence
-   *              which is equal (w.r.t. <code>==</code>) to <code>elem</code>.
-   */
-  def contains(elem: Any): Boolean = exists (_ == elem)
-
-  /** Computes the union of this sequence and the given sequence
-   *  <code>that</code>.
-   *
-   *  @param that the sequence of elements to add to the sequence.
-   *  @return     an sequence containing the elements of this
-   *              sequence and those of the given sequence <code>that</code>
-   *              which are not contained in this sequence.
-   */
-  def union[B >: A](that: Sequence[B]): CC[B] = this ++ (that diff thisCC)
-
-  /** Computes the difference between this sequence and the given sequence
-   *  <code>that</code>.
-   *
-   *  @param that the sequence of elements to remove from this sequence.
-   *  @return     this sequence without the elements of the given sequence
-   *              <code>that</code>.
-   */
-  def diff[B >: A](that: Sequence[B]): CC[A] = this remove (that contains _)
-
-  /** Computes the intersection between this sequence and the given sequence
-   *  <code>that</code>.
-   *
-   *  @param that the sequence to intersect.
-   *  @return     the sequence of elements contained both in this sequence and
-   *              in the given sequence <code>that</code>.
-   */
-  def intersect[B >: A](that: Sequence[B]): CC[A] = this filter(that contains _)
-
-  /** Builds a new sequence from this sequence in which any duplicates (wrt to ==) removed.
-   *  Among duplicate elements, only the first one is retained in the result sequence
-   */
-  def removeDuplicates: CC[A] = {
-    val b = newBuilder[A]
-    var seen = Set[A]()
-    for (x <- this) {
-      if (!(seen contains x)) {
-        b += x
-        seen += x
-      }
-    }
-    b.result
-  }
-
-  /** Returns a sequence of given length containing the elements of this sequence followed by zero
-   *  or more occurrences of given elements. If this sequence is already at least as long as given
-   *  length, it is returned directly. Otherwise, a new sequence is created consisting of the elements
-   *  of this sequence followed by enough occurrences of the given elements to reach the given length.
-   */
-  def padTo[B >: A](len: Int, elem: B): CC[B] = {
-    var diff = len - length
-    val b = newBuilder[B] //!!! drop [B] and get surprising results!
-    b ++= thisCC
-    while (diff > 0) {
-      b += elem
-      diff -=1
-    }
-    b.result
-  }
-
-  /**
-   *  Overridden for efficiency.
-   *
-   *  @return  the sequence itself
-   */
-  override def toSequence: Sequence[A] = thisCC
-
-  def indices: Range = 0 until length
-
-  /** Creates a view of this iterable @see OrderedIterable.View
-   */
-  override def view: SequenceView[CC, A] = new SequenceView[CC, A] { // !!! Martin: We should maybe infer the type parameters here?
-    val origin: Sequence[_] = thisCC
-    val elements: Iterator[A] = self.elements
-    val length: Int = self.length
-    def apply(idx: Int): A = self.apply(idx)
-  }
-
-  /** A sub-sequence view  starting at index `from`
-   *  and extending up to (but not including) index `until`.
-   *
-   *  @param from   The index of the first element of the slice
-   *  @param until  The index of the element following the slice
-   *  @note  The difference between `view` and `slice` is that `view` produces
-   *         a view of the current sequence, whereas `slice` produces a new sequence.
-   *
-   *  @note view(from, to)  is equivalent to view.slice(from, to)
-   */
-  override def view(from: Int, until: Int): SequenceView[CC, A] = view.slice(from, until)
-
-  /** Returns index of the last element satisying a predicate, or -1.
-   *  @deprecated use `lastIndexWhere` instead
-   */
-  @deprecated def findLastIndexOf(p: A => Boolean): Int = lastIndexWhere(p)
-
-  /** A sub-sequence starting at index <code>from</code>
-    *  and extending up to the length of the current sequence
-    *
-    *  @param from   The index of the first element of the slice
-    *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-    *  @deprecated   use <code>drop</code> instead
-    */
-  @deprecated def slice(from: Int): Sequence[A] = slice(from, length)
-
-  /** @deprecated Should be replaced by
-   *
-   *   <code>(s1, s2) forall { case (x, y) => f(x, y) }</code>
-   */
-  @deprecated def equalsWith[B](that: Sequence[B])(f: (A,B) => Boolean): Boolean = {
-    val i = this.elements
-    val j = that.elements
-    while (i.hasNext && j.hasNext && f(i.next, j.next)) ()
-    !i.hasNext && !j.hasNext
-  }
-
-  /** Is <code>that</code> a slice in this?
-   *  @deprecated  Should be repaced by <code>indexOf(that) != -1</code>
-   */
-  @deprecated def containsSlice[B](that: Sequence[B]): Boolean = indexOf(that) != -1
-
-}
diff --git a/src/library/scalax/collection/generic/covartest/SequenceView.scala b/src/library/scalax/collection/generic/covartest/SequenceView.scala
deleted file mode 100755
index e99ffaf652..0000000000
--- a/src/library/scalax/collection/generic/covartest/SequenceView.scala
+++ /dev/null
@@ -1,131 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Sequence.scala 16092 2008-09-12 10:37:06Z nielsen $
-
-
-package scalax.collection.generic.covartest
-
-import util.control.Breaks._
-import annotation.unchecked.uncheckedVariance
-
-import Sequence._
-
-/** A non-strict projection of an iterable.
- * @author Sean McDirmid
- * @author Martin Odersky
- * @note this should really be a virtual class of SequenceFactory
- */
-trait SequenceView[+UC[+B] <: Sequence[B], +A] extends IterableView[UC, A] with Sequence[A] {
-self =>
-
-  /** refined from Iterable.View */
-  val origin: Sequence[_]
-
-  override def newBuilder[A] = underlying.newBuilder[A].asInstanceOf[Builder[Sequence, A]]
-
-  trait Transformed[+B] extends SequenceView[UC, B] {
-    val origin = self
-    protected def asCC = asInstanceOf[SequenceView[UC, B]]
-  }
-
-  class Appended[+B >: A](that: Sequence[B]) extends Transformed[B] {
-    override def elements: Iterator[B] = self.elements ++ that.elements
-    override def length: Int = self.length + that.length
-    override def apply(idx: Int): B = {
-      val ll = self.length
-      if (idx < ll) self.apply(idx) else that.apply(idx - ll)
-    }
-    override def stringPrefix = self.stringPrefix + "A"
-  }
-
-  class Sliced(from: Int, to: Int) extends Transformed[A] {
-    override def elements: Iterator[A] = self.elements slice (from, to)
-    override lazy val length: Int = ((to min self.length) - (from max 0) min 0)
-    override def apply(idx: Int): A =
-      if (idx >= 0 && idx < length) self.apply(idx + from)
-      else throw new IndexOutOfBoundsException(idx.toString)
-    override def stringPrefix = self.stringPrefix + "S"
-    override def slice(from1: Int, to1: Int) =
-      new self.Sliced(from + (from1 min length max 0) , to + (to1 min length max 0)).asInstanceOf[SequenceView[UC, A]]
-  }
-
-  class Mapped[+B](f: A => B) extends Transformed[B] {
-    override def elements: Iterator[B] = self.elements map f
-    override def length: Int = self.length
-    override def apply(idx: Int): B = f(self.apply(idx))
-    override def stringPrefix = self.stringPrefix + "M"
-  }
-
-  class Reversed extends Transformed[A] {
-    override def elements: Iterator[A] = self.reversedElements
-    override def length: Int = self.length
-    override def apply(idx: Int): A = self.apply(length - 1 - idx)
-    override def stringPrefix = super.stringPrefix+"R"
-  }
-
-  class Patched[+B >: A](from: Int, patch: Sequence[B], replaced: Int) extends Transformed[B] {
-    val plen = patch.length
-    override def elements: Iterator[B] = self.elements patch (from, patch, replaced)
-    override def length: Int = self.length + plen - replaced
-    override def apply(idx: Int): B =
-      if (idx < from) self.apply(idx)
-      else if (idx < from + plen) patch.apply(idx - from)
-      else self.apply(idx - plen + replaced)
-    override def stringPrefix = super.stringPrefix+"P"
-  }
-
-  class Zipped[+B](that: Sequence[B]) extends Transformed[(A, B)] {
-    override def elements: Iterator[(A, B)] = self.elements zip that.elements
-    override def length = self.length min that.length
-    override def apply(idx: Int): (A, B) = (self.apply(idx), that.apply(idx))
-    override def stringPrefix = super.stringPrefix+"Z"
-  }
-
-  override def ++[B >: A](that: Iterable[B]): SequenceView[UC, B] =
-    new Appended[B](that.toSequence).asCC
-  override def ++[B >: A](that: Iterator[B]): SequenceView[UC, B] =
-    new Appended[B](that.toSequence).asCC
-  override def map[B](f: A => B): SequenceView[UC, B] =
-    new Mapped(f).asCC
-  override def reverse: SequenceView[UC, A] =
-    (new Reversed).asCC
-  def patch[B >: A](from: Int, patch: Sequence[B], replaced: Int): SequenceView[UC, B] =
-    if (0 <= from && from < length) new Patched(from, patch, replaced).asCC
-    else throw new IndexOutOfBoundsException(from.toString)
-  override def padTo[B >: A](len: Int, elem: B): SequenceView[UC, B] =
-    patch(length, fill((len - length) max 0)(elem), 0)
-  override def zip[B](that: Iterable[B]): SequenceView[UC, (A, B)] =
-    new Zipped(that.toSequence).asCC
-  override def zipWithIndex: SequenceView[UC, (A, Int)] =
-    zip((0 until length).asInstanceOf[Null]) // !@!
-    /*
-  override def zipAll[B, A1 >: A, B1 >: B](that: Iterable[B], thisElem: A1, thatElem: B1): SequenceView[UC, (A1, B1)] = {
-    val that1 = that.toSequence
-    self.padTo(that1.length, thisElem) zip that1.padTo(this.length, thatElem)//.asInstanceOf[SequenceView[UC, (A1, B1)]]
-  }*/
-  override def take(n: Int): SequenceView[UC, A] =
-    slice(0, n)
-  override def drop(n: Int): SequenceView[UC, A] =
-    slice(n, Math.MAX_INT)
-  override def splitAt(n: Int): (SequenceView[UC, A], SequenceView[UC, A]) = (take(n), drop(n))
-  override def slice(from: Int, until: Int): SequenceView[UC, A] =
-    new Sliced(from, until).asCC
-  override def takeWhile(p: A => Boolean): SequenceView[UC, A] =
-    take(prefixLength(p))
-  override def dropWhile(p: A => Boolean): SequenceView[UC, A] =
-    drop(prefixLength(p))
-  override def span(p: A => Boolean): (SequenceView[UC, A], SequenceView[UC, A]) = {
-    val n = prefixLength(p)
-    (take(n), drop(n))
-  }
-
-  // missing here because we can't do anything about them, so we fall back to default construction
-  // if an IterableView via newView: flatMap, filter, partition
-}
-
diff --git a/src/library/scalax/collection/immutable/DefaultSet.scala b/src/library/scalax/collection/immutable/DefaultSet.scala
deleted file mode 100644
index a9ce3fb3df..0000000000
--- a/src/library/scalax/collection/immutable/DefaultSet.scala
+++ /dev/null
@@ -1,45 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashSet.scala 16884 2009-01-09 16:52:09Z cunei $
-
-package scalax.collection.immutable
-
-import generic.SetTemplate
-
-/** A default implementation of immutable sets.
- *  This is currently implemented as a proxy for an immutable HashSet,
- *  except that its builder returns specialized representations EmptySet,Set1,..., Set4
- *  for sets of size <= 4.
- */
-class DefaultSet[A] private (hset: HashSet[A])
-  extends Set[A]
-     with SetTemplate[Set, A] {
-
-  def this() = this(new HashSet[A])
-
-  def contains(elem: A): Boolean = hset.contains(elem)
-
-  def + (elem: A): Set[A] = hset + elem
-
-  /** Keeps underlying HashSet representation, but switches back to EmptySet if
-   *  result does not contain any elements
-   */
-  def - (elem: A): Set[A] = {
-    val hset1 = hset - elem
-    if (hset1.isEmpty) new EmptySet[A]
-    else new DefaultSet(hset)
-  }
-
-  def size: Int = hset.size
-
-  def elements: Iterator[A] = hset.elements
-
-  override def foreach(f: A => Unit): Unit = hset.foreach(f)
-}
-
diff --git a/src/library/scalax/collection/immutable/EmptySet.scala b/src/library/scalax/collection/immutable/EmptySet.scala
deleted file mode 100755
index 32c4915a49..0000000000
--- a/src/library/scalax/collection/immutable/EmptySet.scala
+++ /dev/null
@@ -1,38 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: EmptySet.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-import collection.generic.Builder
-
-/** This class implements empty immutable sets
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class EmptySet[A] extends Set[A] {
-
-  def size: Int = 0
-
-  def contains(elem: A): Boolean = false
-
-  def + (elem: A): Set[A] = new Set1(elem)
-
-  def - (elem: A): Set[A] = this
-
-  def elements: Iterator[A] = Iterator.empty
-
-  override def foreach(f: A => Unit): Unit = {}
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/HashMap.scala b/src/library/scalax/collection/immutable/HashMap.scala
deleted file mode 100644
index 8aaa0239c1..0000000000
--- a/src/library/scalax/collection/immutable/HashMap.scala
+++ /dev/null
@@ -1,164 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashMap.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.immutable
-
-import generic._
-
-/** The canonical factory methods for <a href="HashMap.html">immutable HashMap's</a>.
- *
- *  @author  Martin Odersky
- *  @version 2.0, 19/01/2007
- */
-object HashMap extends MapFactory[HashMap] {
-
-  /** The empty map of this type */
-  def empty[A, B] = new HashMap[A, B]
-
-}
-
-/** This class implements immutable maps using a hash table.
-  * It is optimized for sequential accesses where the last updated table is accessed most often.
-  * It supports with reasonable efficiency accesses to previous versions of the table by keeping
-  * a change log that's regularly compacted.
-  * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.0, 19/01/2007
-  */
-@serializable
-class HashMap[A, B] extends Map[A,B]
-                       with MapTemplate[A, B, HashMap]
-                       with collection.mutable.HashTable[A] {
-
-  type Entry = collection.mutable.DefaultEntry[A, Any]
-
-  protected var later: HashMap[A, B] = null
-  protected var oldKey: A = _
-  protected var oldValue: Option[B] = _
-  protected var deltaSize: Int = _
-
-  override def empty[B] = HashMap.empty[A, B]
-
-  def get(key: A): Option[B] = synchronized {
-    var m = this
-    var cnt = 0
-    while (m.later != null) {
-      if (key == m.oldKey) return m.oldValue
-      cnt += 1
-      m = m.later
-    }
-    if (cnt > logLimit) makeCopy(m)
-    val e = m.findEntry(key)
-    if (e == null) None
-    else Some(getValue(e))
-  }
-
-  def update(key: A, value: B): HashMap[A, B] = synchronized {
-    makeCopyIfUpdated()
-    val e = findEntry(key)
-    if (e == null) {
-      markUpdated(key, None, 1)
-      later.addEntry(new Entry(key, value))
-    } else {
-      markUpdated(key, Some(getValue(e)), 0)
-      e.value = value
-    }
-    later
-  }
-
-  def - (key: A): HashMap[A, B] = synchronized {
-    makeCopyIfUpdated()
-    val e = findEntry(key)
-    if (e == null) this
-    else {
-      markUpdated(key, Some(getValue(e)), -1)
-      later removeEntry key
-      later
-    }
-  }
-
-  override def size: Int = synchronized {
-    var m = this
-    var cnt = 0
-    var s = 0
-    while (m.later != null) {
-      s -= m.deltaSize
-      cnt += 1
-      m = m.later
-    }
-    s += m.tableSize
-    if (cnt > logLimit) makeCopy(m)
-    s
-  }
-
-  def elements = synchronized {
-    makeCopyIfUpdated()
-    entries map {e => (e.key, getValue(e))}
-  }
-
-  private def getValue(e: Entry) =
-    e.value.asInstanceOf[B]
-
-  private def logLimit: Int = Math.sqrt(table.length).toInt
-
-  private def markUpdated(key: A, ov: Option[B], delta: Int) {
-    val lv = loadFactor
-    later = new HashMap[A, B] {
-      override def initialSize = 0
-      override def loadFactor = lv
-      table     = HashMap.this.table
-      tableSize = HashMap.this.tableSize
-      threshold = HashMap.this.threshold
-    }
-    oldKey = key
-    oldValue = ov
-    deltaSize = delta
-  }
-
-  private def makeCopy(last: HashMap[A, B]) {
-    def undo(m: HashMap[A, B]) {
-      if (m ne last) {
-        undo(m.later)
-        if (m.deltaSize == 1) removeEntry(m.oldKey)
-        else if (m.deltaSize == 0) findEntry(m.oldKey).value = m.oldValue.get
-        else if (m.deltaSize == -1) addEntry(new Entry(m.oldKey, m.oldValue.get))
-      }
-    }
-    def copy(e: Entry): Entry =
-      if (e == null) null
-      else {
-        val rest = copy(e.next)
-        val result = new Entry(e.key, e.value)
-        result.next = rest
-        result
-      }
-    val ltable = last.table
-    val s = ltable.length
-    table = new scala.Array[collection.mutable.HashEntry[A, Entry]](s)
-    var i = 0
-    while (i < s) {
-      table(i) = copy(ltable(i).asInstanceOf[Entry])
-      i += 1
-    }
-    tableSize = last.tableSize
-    threshold = last.threshold
-    undo(this)
-    later = null
-  }
-
-  private def makeCopyIfUpdated() {
-    var m = this
-    while (m.later != null) m = m.later
-    if (m ne this) makeCopy(m)
-  }
-}
-
diff --git a/src/library/scalax/collection/immutable/HashSet.scala b/src/library/scalax/collection/immutable/HashSet.scala
deleted file mode 100644
index 56394b9bc6..0000000000
--- a/src/library/scalax/collection/immutable/HashSet.scala
+++ /dev/null
@@ -1,138 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashSet.scala 16884 2009-01-09 16:52:09Z cunei $
-
-package scalax.collection.immutable
-
-import generic.{SetTemplate, SetFactory, AddableBuilder}
-
-/** The canonical factory methods for <a href="HashSet.html">immutable HashSet's<la>.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.8
-  */
-object HashSet extends SetFactory[HashSet] {
-
-  /** The empty set of this type.
-   */
-  def empty[A] = new HashSet[A]
-
-}
-
-/** This class implements immutable maps/sets using a hash table.
-  * It is optimized for sequential accesses where the last updated table is accessed most often.
-  * It supports with reasonable efficiency accesses to previous versions of the table by keeping
-  * a change log that's regularly compacted.
-  * It needs to synchronize most methods, so it is less suitable for highly concurrent accesses.
-  *
-  *  @author  Martin Odersky
-  *  @version 2.0, 19/01/2007
-  */
-@serializable
-class HashSet[A] extends Set[A]
-                    with SetTemplate[HashSet, A]
-                    with mutable.FlatHashTable[A] {
-  protected var later: HashSet[A] = null
-  protected var changedElem: A = _
-  protected var deleted: Boolean = _
-
-  def contains(elem: A): Boolean = synchronized {
-    var m = this
-    var cnt = 0
-    while (m.later != null) {
-      if (elem == m.changedElem) return m.deleted
-      cnt += 1
-      m = m.later
-    }
-    if (cnt > logLimit) makeCopy(m)
-    m.containsEntry(elem)
-  }
-
-  def + (elem: A): HashSet[A] = synchronized {
-    makeCopyIfUpdated()
-    if (containsEntry(elem)) this
-    else {
-      markUpdated(elem, false)
-      later addEntry elem
-      later
-    }
-  }
-
-  def - (elem: A): HashSet[A] = synchronized {
-    makeCopyIfUpdated()
-    if (!containsEntry(elem)) this
-    else {
-      markUpdated(elem, true)
-      later removeEntry elem
-      later
-    }
-  }
-
-  override def size: Int = synchronized {
-    var m = this
-    var cnt = 0
-    var s = 0
-    while (m.later != null) {
-      if (m.deleted) s += 1 else s -= 1
-      cnt += 1
-      m = m.later
-    }
-    s += m.tableSize
-    if (cnt > logLimit) makeCopy(m)
-    s
-  }
-
-  override def elements = synchronized {
-    makeCopyIfUpdated()
-    // note need to cache because (later versions of) set might be mutated while elements are traversed.
-    val cached = new mutable.ArrayBuffer() ++ super.elements
-    cached.elements
-  }
-
-  override def newBuilder[B]: generic.Builder[HashSet, B] =
-    new AddableBuilder[HashSet, B](HashSet.empty)
-
-  private def logLimit: Int = Math.sqrt(table.length).toInt
-
-  private def markUpdated(elem: A, del: Boolean) {
-    val lv = loadFactor
-    later = new HashSet[A] {
-      override def initialSize = 0
-      override def loadFactor = lv
-      table     = HashSet.this.table
-      tableSize = HashSet.this.tableSize
-      threshold = HashSet.this.threshold
-    }
-    changedElem = elem
-    deleted = del
-  }
-
-  private def makeCopy(last: HashSet[A]) {
-    def undo(m: HashSet[A]) {
-      if (m ne last) {
-        undo(m.later)
-        if (m.deleted) addEntry(m.changedElem)
-        else removeEntry(m.changedElem)
-      }
-    }
-    table = new scala.Array[AnyRef](last.table.length)
-    scala.Array.copy(last.table, 0, table, 0, table.length)
-    tableSize = last.tableSize
-    threshold = last.threshold
-    undo(this)
-    later = null
-  }
-
-  private def makeCopyIfUpdated() {
-    var m = this
-    while (m.later != null) m = m.later
-    if (m ne this) makeCopy(m)
-  }
-}
-
diff --git a/src/library/scalax/collection/immutable/Iterable.scala b/src/library/scalax/collection/immutable/Iterable.scala
deleted file mode 100644
index 0e6bb8fae0..0000000000
--- a/src/library/scalax/collection/immutable/Iterable.scala
+++ /dev/null
@@ -1,24 +0,0 @@
-package scalax.collection.immutable
-
-import generic._
-import annotation.unchecked.uncheckedVariance
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *
- *  @author  Matthias Zenger
- *  @autor   Martin Odersky
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait Iterable[+A] extends collection.Iterable[A]
-                      with IterableTemplate[Iterable, A @uncheckedVariance]
-
-object Iterable extends IterableFactory[Iterable] with EmptyIterableFactory[Iterable] {
-  val empty: Iterable[Nothing] = Nil
-}
-
-
diff --git a/src/library/scalax/collection/immutable/Map.scala b/src/library/scalax/collection/immutable/Map.scala
deleted file mode 100755
index 923866fb8e..0000000000
--- a/src/library/scalax/collection/immutable/Map.scala
+++ /dev/null
@@ -1,66 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.immutable
-
-import generic._
-
-object Map extends MapFactory[Map] {
-  private val hashSeed = "Map".hashCode
-  def empty[A, B]: Map[A, B] = new EmptyMap[A, B]
-}
-
-trait Map[A, B] extends MapTemplate[A, B, Map] with collection.Map[A, B] { self =>
-
-  def empty[B]: Map[A, B] = new EmptyMap[A, B]
-
-  /** The same map with a given default function */
-  def withDefault(d: A => B): Map[A, B] = new Map[A, B] {
-    def size = self.size
-    def get(key: A) = self.get(key)
-    def elements = self.elements
-    override def empty[C] = self.empty
-    def update (key: A, value: B): Map[A, B] =
-      self update (key, value) withDefault d
-    def - (key: A): Map[A, B] =
-      self - key withDefault d
-    override def default(key: A): B = d(key)
-  }
-
-  /** The same map with a given default value */
-  def withDefaultValue(d: B): Map[A, B] = withDefault(x => d)
-
-  /** Compares this set with another object and returns true, iff the
-   *  other object is also a set which contains the same elements as
-   *  this set.
-   *
-   *  @param that the other object
-   *  @note not necessarily run-time type safe.
-   *  @return     <code>true</code> iff this set and the other set
-   *              contain the same elements.
-   */
-  override def equals(that: Any): Boolean = that match {
-    case other: Map[a, b] =>
-      this.size == other.size && this.forall {
-        case (key, value) => other.get(key.asInstanceOf[a]) match {
-          case None => false
-          case Some(otherval) => value == otherval
-        }
-      }
-    case _ => false
-  }
-
-  /** A hash method compatible with <code>equals</code>
-   */
-  override def hashCode() =
-    (Map.hashSeed /: this) (_ * 41 + _.hashCode)
-
-}
diff --git a/src/library/scalax/collection/immutable/Map1.scala b/src/library/scalax/collection/immutable/Map1.scala
deleted file mode 100755
index f518c7cf17..0000000000
--- a/src/library/scalax/collection/immutable/Map1.scala
+++ /dev/null
@@ -1,39 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Map1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-/** This class implements immutable maps with exactly one entry
- *
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map1[A, B](key1: A, value1: B) extends Map[A, B] {
-
-  def size = 1
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1) else None
-
-  def elements = Iterator((key1, value1))
-
-  def update (key: A, value: B): Map[A, B] =
-    if (key == key1) new Map1(key1, value)
-    else null // new Map2(key1, value1, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1) empty else this
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Map2.scala b/src/library/scalax/collection/immutable/Map2.scala
deleted file mode 100644
index f3f55c5828..0000000000
--- a/src/library/scalax/collection/immutable/Map2.scala
+++ /dev/null
@@ -1,44 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Map1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-/** This class implements immutable maps with exactly one entry
- *
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map2[A, B](key1: A, value1: B, key2: A, value2: B) extends Map[A, B] {
-
-  def size = 2
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else None
-
-  def elements = Iterator((key1, value1), (key2, value2))
-
-  def update (key: A, value: B): Map[A, B] =
-    if (key == key1) new Map2(key1, value, key2, value2)
-    else if (key == key2) new Map2(key1, value1, key2, value)
-    else new Map3(key1, value1, key2, value2, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1) new Map1(key2, value2)
-    else if (key == key2) new Map1(key1, value1)
-    else this
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Map3.scala b/src/library/scalax/collection/immutable/Map3.scala
deleted file mode 100644
index 3c8e6298cd..0000000000
--- a/src/library/scalax/collection/immutable/Map3.scala
+++ /dev/null
@@ -1,47 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Map1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-/** This class implements immutable maps with exactly one entry
- *
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map3[A, B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B) extends Map[A, B] {
-
-  def size = 3
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else if (key == key3) Some(value3)
-    else None
-
-  def elements = Iterator((key1, value1), (key2, value2), (key3, value3))
-
-  def update (key: A, value: B): Map[A, B] =
-    if (key == key1)      new Map3(key1, value, key2, value2, key3, value3)
-    else if (key == key2) new Map3(key1, value1, key2, value, key3, value3)
-    else if (key == key3) new Map3(key1, value1, key2, value2, key3, value)
-    else new Map4(key1, value1, key2, value2, key3, value3, key, value)
-
-  def - (key: A): Map[A, B] =
-    if (key == key1)      new Map2(key2, value2, key3, value3)
-    else if (key == key2) new Map2(key1, value1, key3, value3)
-    else if (key == key3) new Map2(key1, value1, key2, value2)
-    else this
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Map4.scala b/src/library/scalax/collection/immutable/Map4.scala
deleted file mode 100644
index ad2dcd513b..0000000000
--- a/src/library/scalax/collection/immutable/Map4.scala
+++ /dev/null
@@ -1,50 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Map1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-/** This class implements immutable maps with exactly one entry
- *
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Map4[A, B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B, key4: A, value4: B) extends Map[A, B] {
-
-  def size = 4
-
-  def get(key: A): Option[B] =
-    if (key == key1) Some(value1)
-    else if (key == key2) Some(value2)
-    else if (key == key3) Some(value3)
-    else if (key == key4) Some(value4)
-    else None
-
-  def elements = Iterator((key1, value1), (key2, value2), (key3, value3), (key4, value4))
-
-  def update (key: A, value: B): Map[A, B] =
-    if (key == key1)      new Map4(key1, value, key2, value2, key3, value3, key4, value4)
-    else if (key == key2) new Map4(key1, value1, key2, value, key3, value3, key4, value4)
-    else if (key == key3) new Map4(key1, value1, key2, value2, key3, value, key4, value4)
-    else if (key == key4) new Map4(key1, value1, key2, value2, key3, value3, key4, value)
-    else HashMap((key1, value1), (key2, value2), (key3, value3), (key4, value4), (key, value))
-
-  def - (key: A): Map[A, B] =
-    if (key == key1)      new Map3(key2, value2, key3, value3, key4, value4)
-    else if (key == key2) new Map3(key1, value1, key3, value3, key4, value4)
-    else if (key == key3) new Map3(key1, value1, key2, value2, key4, value4)
-    else if (key == key4) new Map3(key1, value1, key2, value2, key3, value3)
-    else this
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/OrderedIterable.scala b/src/library/scalax/collection/immutable/OrderedIterable.scala
deleted file mode 100644
index 80fa418eec..0000000000
--- a/src/library/scalax/collection/immutable/OrderedIterable.scala
+++ /dev/null
@@ -1,26 +0,0 @@
-package scalax.collection.immutable
-
-import generic._
-import annotation.unchecked.uncheckedVariance
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *
- *  @author  Matthias Zenger
- *  @autor   Martin Odersky
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait OrderedIterable[+A] extends immutable.Iterable[A]
-                             with OrderedIterableTemplate[OrderedIterable, A @uncheckedVariance]
-                             with collection.OrderedIterable[A]
-
-object OrderedIterable extends IterableFactory[OrderedIterable]
-                          with EmptyIterableFactory[OrderedIterable] {
-  val empty: OrderedIterable[Nothing] = Nil
-}
-
-
diff --git a/src/library/scalax/collection/immutable/Sequence.scala b/src/library/scalax/collection/immutable/Sequence.scala
deleted file mode 100644
index 78de3cbfaf..0000000000
--- a/src/library/scalax/collection/immutable/Sequence.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-package scalax.collection.immutable
-
-import generic._
-import annotation.unchecked.uncheckedVariance
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *
- *  @author  Matthias Zenger
- *  @autor   Martin Oderskyter
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait Sequence[+A] extends OrderedIterable[A]
-                      with SequenceTemplate[Sequence, A @uncheckedVariance]
-                      with collection.Sequence[A]
-
-object Sequence extends SequenceFactory[Sequence] with EmptyIterableFactory[Sequence] {
-  val empty: Sequence[Nothing] = Nil
-}
-
-
diff --git a/src/library/scalax/collection/immutable/Set.scala b/src/library/scalax/collection/immutable/Set.scala
deleted file mode 100755
index 9462cd3c5f..0000000000
--- a/src/library/scalax/collection/immutable/Set.scala
+++ /dev/null
@@ -1,45 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.immutable
-
-import generic._
-
-object Set extends generic.SetFactory[Set] {
-  private val hashSeed = "Set".hashCode
-  def empty[A]: Set[A] = new EmptySet[A]
-}
-
-trait Set[A] extends OrderedIterable[A]
-                with collection.Set[A]
-                with SetTemplate[Set, A] {
-
-  override def newBuilder[B]: Builder[Set, B] = Set.newBuilder[B]
-
-  /** Compares this set with another object and returns true, iff the
-   *  other object is also a set which contains the same elements as
-   *  this set.
-   *
-   *  @param that the other object
-   *  @note not necessarily run-time type safe.
-   *  @return     <code>true</code> iff this set and the other set
-   *              contain the same elements.
-   */
-  override def equals(that: Any): Boolean = that match {
-    case other: Set[_] =>
-      this.size == other.size && subsetOf(other.asInstanceOf[Set[A]])
-    case _ =>
-      false
-  }
-
-  override def hashCode = (Set.hashSeed /: this)(_ * 41 + _.hashCode)
-
-}
diff --git a/src/library/scalax/collection/immutable/Set1.scala b/src/library/scalax/collection/immutable/Set1.scala
deleted file mode 100755
index 276cd83bb0..0000000000
--- a/src/library/scalax/collection/immutable/Set1.scala
+++ /dev/null
@@ -1,46 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-import collection.generic.Builder
-
-/** This class implements immutable sets with exactly one element.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set1[A](elem1: A) extends Set[A] {
-
-  def size: Int = 1
-
-  def contains(elem: A): Boolean =
-    elem == elem1
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set2(elem1, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) new EmptySet[A]
-    else this
-
-  def elements: Iterator[A] =
-    Iterator(elem1)
-
-  override def foreach(f: A => Unit): Unit = {
-    f(elem1)
-  }
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Set2.scala b/src/library/scalax/collection/immutable/Set2.scala
deleted file mode 100755
index 828c52d053..0000000000
--- a/src/library/scalax/collection/immutable/Set2.scala
+++ /dev/null
@@ -1,47 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-import collection.generic.Builder
-
-/** This class implements immutable sets with exactly one element.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set2[A](elem1: A, elem2: A) extends Set[A] {
-
-  def size: Int = 2
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set3(elem1, elem2, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) new Set1(elem2)
-    else if (elem == elem2) new Set1(elem1)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator(elem1, elem2)
-
-  override def foreach(f: A => Unit): Unit = {
-    f(elem1); f(elem2)
-  }
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Set3.scala b/src/library/scalax/collection/immutable/Set3.scala
deleted file mode 100755
index f14253231f..0000000000
--- a/src/library/scalax/collection/immutable/Set3.scala
+++ /dev/null
@@ -1,48 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-import collection.generic.Builder
-
-/** This class implements immutable sets with exactly one element.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set3[A](elem1: A, elem2: A, elem3: A) extends Set[A] {
-
-  def size: Int = 3
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2 || elem == elem3
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new Set4(elem1, elem2, elem3, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) new Set2(elem2, elem3)
-    else if (elem == elem2) new Set2(elem1, elem3)
-    else if (elem == elem3) new Set2(elem1, elem2)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator(elem1, elem2, elem3)
-
-  override def foreach(f: A => Unit): Unit = {
-    f(elem1); f(elem2); f(elem3)
-  }
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Set4.scala b/src/library/scalax/collection/immutable/Set4.scala
deleted file mode 100755
index bef1b6588d..0000000000
--- a/src/library/scalax/collection/immutable/Set4.scala
+++ /dev/null
@@ -1,49 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set1.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-
-package scalax.collection.immutable
-
-import collection.generic.Builder
-
-/** This class implements immutable sets with exactly one element.
- *  @author  Martin Oderskty
- *  @version 1.0, 019/01/2007
- */
-@serializable
-class Set4[A](elem1: A, elem2: A, elem3: A, elem4: A) extends Set[A] {
-
-  def size: Int = 4
-
-  def contains(elem: A): Boolean =
-    elem == elem1 || elem == elem2 || elem == elem3 || elem == elem4
-
-  def + (elem: A): Set[A] =
-    if (contains(elem)) this
-    else new DefaultSet[A] + (elem1, elem2, elem3, elem4, elem)
-
-  def - (elem: A): Set[A] =
-    if (elem == elem1) new Set3(elem2, elem3, elem4)
-    else if (elem == elem2) new Set3(elem1, elem3, elem4)
-    else if (elem == elem3) new Set3(elem1, elem2, elem4)
-    else if (elem == elem4) new Set3(elem1, elem2, elem3)
-    else this
-
-  def elements: Iterator[A] =
-    Iterator(elem1, elem2, elem3, elem4)
-
-  override def foreach(f: A => Unit): Unit = {
-    f(elem1); f(elem2); f(elem3); f(elem4)
-  }
-}
-
-
-
diff --git a/src/library/scalax/collection/immutable/Stream.scala b/src/library/scalax/collection/immutable/Stream.scala
deleted file mode 100755
index 4055be40bc..0000000000
--- a/src/library/scalax/collection/immutable/Stream.scala
+++ /dev/null
@@ -1,794 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Stream.scala 16287 2008-10-18 13:41:36Z nielsen $
-
-
-package scalax.collection.immutable
-
-import mutable.ListBuffer
-import generic.{SequenceTemplate, SequenceFactory, EmptyIterableFactory, Builder, LazyBuilder}
-import annotation.unchecked.uncheckedVariance
-import annotation.tailrec
-
-/**
- * The object <code>Stream</code> provides helper functions
- * to manipulate streams.
- *
- * @author Martin Odersky, Matthias Zenger
- * @version 1.1 08/08/03
- */
-object Stream extends SequenceFactory[Stream] with EmptyIterableFactory[Stream] {
-
-  import collection.{Iterable, OrderedIterable, Sequence, Vector}
-
-  override val empty: Stream[Nothing] = Nil
-  override def apply[A](xs: A*) = xs.asInstanceOf[Iterable[A]].toList // !@!
-  override def newBuilder[B]: Builder[Stream, B] = new ListBuffer[B]
-
-  class ConsWrapper[A](tl: => Stream[A]) {
-    def #::(hd: A): Stream[A] = new Cons(hd, tl)
-    def #:::(prefix: Stream[A]): Stream[A] = prefix append tl
-  }
-
-  implicit def consWrapper[A](stream: => Stream[A]): ConsWrapper[A] =
-    new ConsWrapper[A](stream)
-
-  object #:: {
-    def unapply[A](xs: Stream[A]): Option[(A, Stream[A])] =
-      if (xs.isEmpty) None
-      else Some(xs.head, xs.tail)
-  }
-
-  /** @deprecated   use #:: instead */
-  @deprecated lazy val lazy_:: = #::
-
-  /** An alternative way of building and matching Streams using Stream.cons(hd, tl).
-   */
-  object cons {
-
-    /** A stream consisting of a given first element and remaining elements
-     *  @param hd   The first element of the result stream
-     *  @param tl   The remaining elements of the result stream
-     */
-    def apply[A](hd: A, tl: => Stream[A]) = new Cons(hd, tl)
-
-    /** Maps a stream to its head and tail */
-    def unapply[A](xs: Stream[A]): Option[(A, Stream[A])] = #::.unapply(xs)
-  }
-
-  final class Cons[+A](hd: A, tl: => Stream[A]) extends Stream[A] {
-    override def isEmpty = false
-    override def head = hd
-    private[this] var tlVal: Stream[A] = _
-    private def tlDefined = tlVal ne null
-    override def tail: Stream[A] = {
-      if (!tlDefined) { tlVal = tl }
-      tlVal
-    }
-    override def hasDefiniteSize = tlDefined && tlVal.hasDefiniteSize
-
-    // Overridden methods from IterableTemplate or overloaded variants of such methods
-
-    /** Create a new stream which contains all elements of this stream
-     *  followed by all elements of Iterable `that'
-     */
-    override def ++[B >: A](that: Iterable[B]): Stream[B] = this append that
-
-    /** Create a new stream which contains all elements of this stream
-     *  followed by all elements of Iterator `that'
-     */
-    override def ++[B >: A](that: Iterator[B]): Stream[B] = this append that.toStream
-
-    /** Returns the stream resulting from applying the given function
-     *  <code>f</code> to each element of this stream.
-     *
-     *  @param f function to apply to each element.
-     *  @return  <code>f(a<sub>0</sub>), ..., f(a<sub>n</sub>)</code> if this
-     *           sequence is <code>a<sub>0</sub>, ..., a<sub>n</sub></code>.
-     */
-    override def map[B](f: A => B): Stream[B] =
-      new Cons(f(head), tail map f)
-
-    /** Applies the given function <code>f</code> to each element of
-     *  this stream, then concatenates the results.
-     *
-     *  @param f the function to apply on each element.
-     *  @return  <code>f(a<sub>0</sub>) ::: ... ::: f(a<sub>n</sub>)</code> if
-     *           this stream is <code>[a<sub>0</sub>, ..., a<sub>n</sub>]</code>.
-     */
-    override def flatMap[B](f: A => Iterable[B]): Stream[B] = {
-      // drops A's for which f yields an empty Iterable[B]
-      def loop(s: Stream[A]): Stream[B] =
-        if (s.isEmpty) Nil
-        else {
-          val i = f(s.head)
-          if (i.isEmpty) loop(s.tail)
-          else i.toStream append loop(s.tail)
-        }
-      loop(this)
-    }
-
-    /** Returns all the elements of this stream that satisfy the
-     *  predicate <code>p</code>. The order of the elements is preserved.
-     *
-     *  @param p the predicate used to filter the stream.
-     *  @return the elements of this stream satisfying <code>p</code>.
-     */
-    override def filter(p: A => Boolean): Stream[A] = {
-      // drops A's for which p yields false
-      def loop(s: Stream[A]): Stream[A] =
-        if (s.isEmpty) Nil
-        else {
-          val b = p(s.head)
-          if (!b) loop(s.tail)
-          else new Cons(s.head, tail filter p)
-        }
-      loop(this)
-    }
-
-    /** Returns all the elements of this stream that satisfy the
-     *  predicate <code>p</code>. The order of the elements is preserved.
-     *
-     *  @param p the predicate used to filter the stream.
-     *  @return the elements of this stream satisfying <code>p</code>.
-     */
-    override def partition(p: A => Boolean): (Stream[A], Stream[A]) = (filter(p(_)), remove(p(_)))
-
-    /** Returns a stream formed from this stream and the specified stream
-     *  <code>that</code> by associating each element of the former with
-     *  the element at the same position in the latter.
-     *  If one of the two streams is longer than the other, its remaining elements are ignored.
-     *
-     *  @return     <code>Stream({a<sub>0</sub>,b<sub>0</sub>}, ...,
-     *              {a<sub>min(m,n)</sub>,b<sub>min(m,n)</sub>)}</code> when
-     *              <code>Stream(a<sub>0</sub>, ..., a<sub>m</sub>)
-     *              zip Stream(b<sub>0</sub>, ..., b<sub>n</sub>)</code> is invoked.
-     */
-    def zip[B](that: Stream[B]): Stream[(A, B)] =
-      if (that.isEmpty) empty
-      else new Cons((this.head, that.head), this.tail zip that.tail)
-
-    /** Returns a list formed from this list and the specified list
-     *  <code>that</code> by associating each element of the former with
-     *  the element at the same position in the latter.
-     *
-     *  @param that     list <code>that</code> may have a different length
-     *                  as the self list.
-     *  @param thisElem element <code>thisElem</code> is used to fill up the
-     *                  resulting list if the self list is shorter than
-     *                  <code>that</code>
-     *  @param thatElem element <code>thatElem</code> is used to fill up the
-     *                  resulting list if <code>that</code> is shorter than
-     *                  the self list
-     *  @return         <code>List((a<sub>0</sub>,b<sub>0</sub>), ...,
-     *                  (a<sub>n</sub>,b<sub>n</sub>), (elem,b<sub>n+1</sub>),
-     *                  ..., {elem,b<sub>m</sub>})</code>
-     *                  when <code>[a<sub>0</sub>, ..., a<sub>n</sub>] zip
-     *                  [b<sub>0</sub>, ..., b<sub>m</sub>]</code> is
-     *                  invoked where <code>m &gt; n</code>.
-     */
-    def zipAll[B, A1 >: A, B1 >: B](that: Stream[B], thisElem: A1, thatElem: B1): Stream[(A1, B1)] = {
-      if (that.isEmpty) new Cons((this.head, thatElem), this.tail.zipAll(that, thisElem, thatElem))
-      else new Cons((this.head, that.head), this.tail.zipAll(that.tail, thisElem, thatElem))
-    }
-
-    /** Zips this iterable with its indices. `s.zipWithIndex` is equivalent to
-     *  `s zip s.indices`
-     */
-    override def zipWithIndex = this zip (Iterator.from(0).toStream)
-
-    /** Write all defined elements of this iterable into given string builder.
-     *  The written text begins with the string <code>start</code> and is finished by the string
-     *  <code>end</code>. Inside, the string representations of defined elements (w.r.t.
-     *  the method <code>toString()</code>) are separated by the string
-     *  <code>sep</code>. The method will not force evaluation of undefined elements. A
-     *  tail of such elements will be represented by a "?" instead.
-     */
-    override def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder = {
-      b append start append hd
-      if (tlDefined) tlVal.addString(b, sep, sep, end)
-      else b append ", ?" append end
-    }
-
-    /** Returns the <code>n</code> first elements of this stream, or else the whole
-     *  stream, if it has less than <code>n</code> elements.
-     *
-     *  @param n the number of elements to take.
-     *  @return the <code>n</code> first elements of this stream.
-     */
-    override def take(n: Int): Stream[A] =
-      if (n <= 0) Nil else new Cons(head, tail take (n-1))
-
-    /** Returns the stream without its <code>n</code> first elements.
-     *  If the stream has less than <code>n</code> elements, the empty stream is returned.
-     *
-     *  @param n the number of elements to drop.
-     *  @return the stream without its <code>n</code> first elements.
-     */
-    override def drop(n: Int): Stream[A] = {
-      var these: Stream[A] = this
-      var i = n
-      while (!these.isEmpty && i > 0) {
-        these = these.tail
-        i -= 1
-      }
-      these
-    }
-
-    /** A substream starting at index `from`
-     *  and extending up to (but not including) index `until`.
-     *
-     *  @This is equivalent to (but possibly more efficient than)
-     *  c.drop(from).take(to - from)
-     *
-     *  @param from   The index of the first element of the returned subsequence
-     *  @param until  The index of the element following the returned subsequence
-     *  @throws IndexOutOfBoundsException if <code>from &lt; 0</code>
-     *          or <code>length &lt; from + len<code>
-     *  @note  Might return different results for different runs, unless this iterable is ordered
-     */
-    override def slice(from: Int, to: Int): Stream[A] =
-      this.drop(from).take(to - from)
-
-    /** The stream without its last element.
-     *  @throws Predef.UnsupportedOperationException if the stream is empty.
-     */
-    override def init: Stream[A] =
-      if (tail.isEmpty) Nil
-      else new Cons(head, tail.init)
-
-    /** Returns the rightmost <code>n</code> elements from this iterable.
-     *  @param n the number of elements to take
-     */
-    override def takeRight(n: Int): Stream[A] = {
-      var these: Stream[A] = this
-      var lead = this drop n
-      while (!lead.isEmpty) {
-        these = these.tail
-        lead = lead.tail
-      }
-      these
-    }
-
-    /** Returns the longest prefix of this stream whose elements satisfy
-     *  the predicate <code>p</code>.
-     *
-     *  @param p the test predicate.
-     */
-    override def takeWhile(p: A => Boolean): Stream[A] =
-      if (p(head)) new Cons(head, tail takeWhile p) else Nil
-
-
-    /** Returns the longest suffix of this iterable whose first element
-     *  does not satisfy the predicate <code>p</code>.
-     *
-     *  @param p the test predicate.
-     */
-    override def dropWhile(p: A => Boolean): Stream[A] = {
-      var these: Stream[A] = this
-      while (!these.isEmpty && p(these.head)) these = these.tail
-      these
-    }
-
-    /** Returns a pair consisting of the longest prefix of the stream whose
-     *  elements all satisfy the given predicate, and the rest of the stream.
-     *
-     *  @param p the test predicate
-     */
-    override def span(p: A => Boolean): (List[A], Stream[A]) = {
-      var these: Stream[A] = this
-      val l = new ListBuffer[A]
-      while (!these.isEmpty && p(these.head)) {
-        l += these.head
-        these = these.tail
-      }
-      (l.toList, these)
-    }
-
-    // Overridden methods from Sequence
-
-    /** Builds a new stream from this stream in which any duplicates (wrt to ==) removed.
-     *  Among duplicate elements, only the first one is retained in the result stream
-     */
-    override def removeDuplicates: Stream[A] =
-      new Cons(head, tail.filter(head !=).removeDuplicates)
-
-    /** Returns a new sequence of given length containing the elements of this sequence followed by zero
-     *  or more occurrences of given elements.
-     */
-    override def padTo[B >: A](len: Int, elem: B): Stream[B] =
-      new Cons(head, tail.padTo(len - 1, elem))
-  }
-
-  /**
-   * Create an infinite stream starting at <code>start</code>
-   * and incrementing by step <code>step</code>
-   *
-   * @param start the start value of the stream
-   * @param step the increment value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  def from(start: Int, step: Int): Stream[Int] =
-    new Cons(start, from(start+step, step))
-
-  /**
-   * Create an infinite stream starting at <code>start</code>
-   * and incrementing by 1.
-   *
-   * @param start the start value of the stream
-   * @return the stream starting at value <code>start</code>.
-   */
-  def from(start: Int): Stream[Int] = from(start, 1)
-
-  /**
-   * Create an infinite stream containing the given element expression (which is computed for each
-   * occurrence)
-   * @param elem the element composing the resulting stream
-   * @return the stream containing an inifinite number of elem
-   * @deprecated use fill instead
-   */
-  @deprecated def fill[A](elem: => A): Stream[A] = new Cons(elem, fill(elem))
-
-  /** A stream containing all elements of a given iterator, in the order they are produced.
-   *  @param it   The iterator producing the stream's elements
-   *  @deprecated use it.toStream instead
-   */
-  @deprecated def fromIterator[A](it: Iterator[A]): Stream[A] =
-    if (it.hasNext) cons(it.next, fromIterator(it)) else empty
-
-  /** The concatenation of a sequence of streams
-   * @deprecated use xs.flatten instead
-   */
-  @deprecated def concat[A](xs: Iterable[Stream[A]]): Stream[A] = concat(xs.elements)
-
-  /** The concatenation of all streams returned by an iterator
-   * @deprecated use xs.toStream.flatten instead
-   */
-  @deprecated def concat[A](xs: Iterator[Stream[A]]): Stream[A] =
-    if (xs.hasNext) xs.next append concat(xs)
-    else empty
-
-  /**
-   * Create a stream with element values
-   * <code>v<sub>n+1</sub> = step(v<sub>n</sub>)</code>
-   * where <code>v<sub>0</sub> = start</code>
-   * and elements are in the range between <code>start</code> (inclusive)
-   * and <code>end</code> (exclusive)
-   * @deprecated  use @see iterate instead.
-   * @param start the start value of the stream
-   * @param end the end value of the stream
-   * @param step the increment function of the stream, must be monotonically increasing or decreasing
-   * @return the stream starting at value <code>start</code>.
-   */
-  @deprecated def range(start: Int, end: Int, step: Int => Int): Stream[Int] = {
-    val up = step(start) > start
-    val down = step(start) < start
-    def loop(lo: Int): Stream[Int] =
-      if ((!up || lo < end) && (!down || lo > end)) cons(lo, loop(step(lo)))
-      else empty
-    loop(start)
-  }
-
-  /**
-   * Create an infinite stream containing the given element.
-   *
-   * @param elem the element composing the resulting stream
-   * @return the stream containing an inifinite number of elem
-   * @deprecated use fill(elem) instead
-   */
-  @deprecated def const[A](elem: A): Stream[A] = cons(elem, const(elem))
-
-  /** Create a stream containing several copies of an element.
-   *
-   *  @param n    the length of the resulting stream
-   *  @param elem the element composing the resulting stream
-   *  @return     the stream composed of n elements all equal to elem
-   *  @deprecated use fill(n, elem) instead
-   */
-  @deprecated def make[A](n: Int, elem: A): Stream[A] =
-    const(elem) take n
-}
-
-import Stream._
-
-/**
- * <p>The class <code>Stream</code> implements lazy lists where elements
- * are only evaluated when they are needed. Here is an example:</p>
- * <pre>
- * <b>object</b> Main <b>extends</b> Application {
- *
- *   <b>def</b> from(n: Int): Stream[Int] =
- *     Stream.cons(n, from(n + 1))
- *
- *   <b>def</b> sieve(s: Stream[Int]): Stream[Int] =
- *     Stream.cons(s.head, sieve(s.tail filter { _ % s.head != 0 }))
- *
- *   <b>def</b> primes = sieve(from(2))
- *
- *   primes take 10 print
- * }
- * </pre>
- *
- * @author Martin Odersky, Matthias Zenger
- * @version 1.1 08/08/03
- */
-abstract class Stream[+A] extends Sequence[A]
-                             with SequenceTemplate[Stream, A @uncheckedVariance] {
-self =>
-
-  import collection.{Iterable, OrderedIterable, Sequence, Vector}
-
-  /** is this stream empty? */
-  def isEmpty: Boolean
-
-  /** The first element of this stream
-   *  @throws Predef.NoSuchElementException if the stream is empty.
-   */
-  def head: A
-
-  /** A stream consisting of the remaining elements of this stream after the first one.
-   *  @throws Predef.UnsupportedOperationException if the stream is empty.
-   */
-  def tail: Stream[A]
-
-  // Implementation of abstract methods
-
-  /** Create a new @see LazyBuilder to build a stream */
-  def newBuilder[B]: Builder[Stream, B] = new LazyBuilder[Stream, B] {
-    def result: Stream[B] = elements.toStream
-  }
-
-  /** Returns the number of elements in the list.
-   */
-  def length: Int = {
-    var these = self
-    var len = 0
-    while (!these.isEmpty) {
-      len += 1
-      these = these.tail
-    }
-    len
-  }
-
-  /** Returns the <code>n</code>-th element of this stream. The first element
-   *  (head of the stream) is at position 0.
-   *
-   *  @param n index of the element to return
-   *  @return  the element at position <code>n</code> in this stream.
-   *  @throws Predef.NoSuchElementException if the stream is too short.
-   */
-  override def apply(n: Int): A = drop(n).head
-
-  // New methods in Stream
-
-  /** The stream resulting from the concatenation of this stream with the argument stream.
-   *  @param rest   The stream that gets appended to this stream
-   */
-  def append[B >: A](rest: => Iterable[B]): Stream[B] =
-    if (isEmpty) rest.toStream else new Cons(head, tail append rest)
-
-  /** Force evaluation of the whole stream and return it */
-  def force: Stream[A] = {
-    var these = this
-    while (!isEmpty) these = these.tail
-    this
-  }
-
-  /** Prints elements of this stream one by one, separated by commas */
-  def print() { print(", ") }
-
-  /** Prints elements of this stream one by one, separated by <code>sep</code>
-   *  @param sep   The separator string printed between consecutive elements.
-   */
-  def print(sep: String) {
-    @tailrec
-    def loop(these: Stream[A], start: String) {
-      Console.print(start)
-      if (isEmpty) Console.print("empty")
-      else {
-        Console.print(these.head)
-        loop(these.tail, sep)
-      }
-    }
-    loop(this, "")
-  }
-
-  // Overridden methods from IterableTemplate or overloaded variants of such methods
-
-  /** Returns the elements in the sequence as an iterator
-   */
-  override def elements: Iterator[A] = new Iterator[A] {
-    var these = self
-    def hasNext: Boolean = !these.isEmpty
-    def next: A =
-      if (hasNext) {
-        val result = these.head; these = these.tail; result
-      } else Iterator.empty.next
-    override def toList: List[A] = these.toList
-  }
-
-  /** Apply the given function <code>f</code> to each element of this stream
-   *  (while respecting the order of the elements).
-   *
-   *  @param f the treatment to apply to each element.
-   */
-  override def foreach(f: A => Unit) {
-    var these = this
-    while (!these.isEmpty) {
-      f(these.head)
-      these = these.tail
-    }
-  }
-
-  /** Tests if the predicate <code>p</code> is satisfied by all elements
-   *  in this list.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff all elements of this list satisfy the
-   *           predicate <code>p</code>.
-   */
-  override def forall(p: A => Boolean): Boolean = {
-    var these = this
-    while (!these.isEmpty) {
-      if (!p(these.head)) return false
-      these = these.tail
-    }
-    true
-  }
-
-  /** Tests the existence in this list of an element that satisfies the
-   *  predicate <code>p</code>.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @param p the test predicate.
-   *  @return  <code>true</code> iff there exists an element in this list that
-   *           satisfies the predicate <code>p</code>.
-   */
-  override def exists(p: A => Boolean): Boolean = {
-    var these = this
-    while (!these.isEmpty) {
-      if (p(these.head)) return true
-      these = these.tail
-    }
-    false
-  }
-
-  /** Count the number of elements in the iterable which satisfy a predicate.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @param p the predicate for which to count
-   *  @return  the number of elements satisfying the predicate <code>p</code>.
-   */
-  override def count(p: A => Boolean): Int = {
-    var these = this
-    var cnt = 0
-    while (!these.isEmpty) {
-      if (p(these.head)) cnt += 1
-      these = these.tail
-    }
-    cnt
-  }
-
-  /** Find and return the first element of the list satisfying a
-   *  predicate, if any.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @param p the predicate
-   *  @return the first element in the list satisfying <code>p</code>,
-   *  or <code>None</code> if none exists.
-   */
-  override def find(p: A => Boolean): Option[A] = {
-    var these = this
-    while (!these.isEmpty) {
-      if (p(these.head)) return Some(these.head)
-      these = these.tail
-    }
-    None
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  function <code>f</code>, from left to right, and starting with
-   *  the value <code>z</code>.
-   *
-   *  !!! todo: perform speed with inherited version from Iterable, and drop
-   *      if not significantly better
-   *  @return <code>f(... (f(f(z, a<sub>0</sub>), a<sub>1</sub>) ...),
-   *          a<sub>n</sub>)</code> if the list is
-   *          <code>[a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub>]</code>.
-   */
-  override def foldLeft[B](z: B)(f: (B, A) => B): B = {
-    var acc = z
-    var these = this
-    while (!these.isEmpty) {
-      acc = f(acc, these.head)
-      these = these.tail
-    }
-    acc
-  }
-
-  /** Combines the elements of this list together using the binary
-   *  function <code>f</code>, from right to left, and starting with
-   *  the value <code>z</code>.
-   *
-   *  @return <code>f(a<sub>0</sub>, f(a<sub>1</sub>, f(..., f(a<sub>n</sub>, z)...)))</code>
-   *          if the list is <code>[a<sub>0</sub>, a1, ..., a<sub>n</sub>]</code>.
-   */
-  override def foldRight[B](z: B)(f: (A, B) => B): B =
-    if (this.isEmpty) z
-    else f(head, tail.foldRight(z)(f))
-
-  /** Combines the elements of this list together using the binary
-   *  operator <code>op</code>, from left to right
-   *  @param op  The operator to apply
-   *  @return <code>op(... op(a<sub>0</sub>,a<sub>1</sub>), ..., a<sub>n</sub>)</code>
-      if the list has elements
-   *          <code>a<sub>0</sub>, a<sub>1</sub>, ..., a<sub>n</sub></code>.
-   *  @throws Predef.UnsupportedOperationException if the list is empty.
-   */
-  override def reduceLeft[B >: A](f: (B, A) => B): B =
-    if (isEmpty) throw new UnsupportedOperationException("empty.reduceLeft")
-    else tail.foldLeft[B](head)(f)
-
-  /** Combines the elements of this iterable object together using the binary
-   *  operator <code>op</code>, from right to left
-   *  @note Will not terminate for infinite-sized collections.
-   *  @param op  The operator to apply
-   *
-   *  @return <code>a<sub>0</sub> op (... op (a<sub>n-1</sub> op a<sub>n</sub>)...)</code>
-   *          if the iterable object has elements <code>a<sub>0</sub>, a<sub>1</sub>, ...,
-   *          a<sub>n</sub></code>.
-   *
-   *  @throws Predef.UnsupportedOperationException if the iterator is empty.
-   */
-  override def reduceRight[B >: A](op: (A, B) => B): B =
-    if (isEmpty) throw new UnsupportedOperationException("Nil.reduceRight")
-    else if (tail.isEmpty) head
-    else op(head, tail.reduceRight(op))
-
-  /**
-   *  Create a stream which contains all the elements of this iterable object.
-   *  @note consider using <code>projection</code> for lazy behavior.
-   */
-  override def toStream: Stream[A] = this
-
-  /** Defines the prefix of this object's <code>toString</code> representation as ``Stream''.
-   */
-  override def stringPrefix = "Stream"
-
-  /** The last element of this stream.
-   *
-   *  @throws Predef.NoSuchElementException if the stream is empty.
-   */
-  override def last: A = {
-    if (isEmpty) throw new NoSuchElementException
-    var these = this
-    var nx = these.tail
-    while (!nx.isEmpty) {
-      these = nx
-      nx = nx.tail
-    }
-    these.head
-  }
-
-  /** Returns the rightmost <code>n</code> elements from this iterable.
-   *  @param n the number of elements to take
-   */
-  override def dropRight(n: Int): List[A] = {
-    val b = new ListBuffer[A]
-    var these = this
-    var lead = this drop n
-    while (!lead.isEmpty) {
-      b += these.head
-      these = these.tail
-      lead = lead.tail
-    }
-    b.toList
-  }
-
-  /** Returns true iff the other stream contains the same elements as this one.
-   *
-   *  @note will not terminate for two infinite-sized streams.
-   *  @param that  the other stream
-   */
-  def sameElements[B >: A](that: Stream[B]): Boolean = {
-    val these = this
-    val those = that
-    while (!these.isEmpty && !those.isEmpty && these.head == those.head) {}
-    these.isEmpty && those.isEmpty
-  }
-
-  // Overridden methods from Sequence
-
-  /** Result of comparing <code>length</code> with operand <code>len</code>.
-   *  returns <code>x</code> where
-   *  <code>x &lt; 0</code>    iff    <code>this.length &lt; len</code>
-   *  <code>x == 0</code>   iff    <code>this.length == len</code>
-   *  <code>x &gt; 0</code>    iff    <code>this.length &gt; len</code>.
-   */
-  override def lengthCompare(len: Int): Int =  {
-    var i = 0
-    var these = self
-    while (!these.isEmpty && i <= len) {
-      i += 1
-      these = these.tail
-    }
-    i - len
-  }
-
-  /** Is this partial function defined for the index <code>x</code>?
-   */
-  override def isDefinedAt(x: Int): Boolean = x >= 0 && lengthCompare(x) >= 0
-
-  /** Returns length of longest segment starting from a start index `from`
-   *  such that every element of the segment satisfies predicate `p`.
-   *  @note may not terminate for infinite-sized collections.
-   *  @param  p the predicate
-   *  @param  from  the start index
-   */
-  override def segmentLength(p: A => Boolean, from: Int): Int = {
-    var i = from
-    var these = this drop from
-    while (!these.isEmpty && p(these.head)) {
-      i += 1
-      these = these.tail
-    }
-    i
-  }
-
-  /** Returns index of the first element starting from a start index
-   *  satisying a predicate, or -1, if none exists.
-   *
-   *  @note may not terminate for infinite-sized streams.
-   *  @param  p the predicate
-   *  @param  from  the start index
-   */
-  override def indexWhere(p: A => Boolean, from: Int): Int = {
-    var i = from
-    var these = this drop from
-    while (!these.isEmpty && !p(these.head)) {
-      i += 1
-      these = these.tail
-    }
-    if (these.isEmpty) -1 else i
-  }
-
-  /** Returns index of the last element satisying a predicate, or -1, if none exists.
-   *
-   *  @param  p the predicate
-   *  @return   the index of the last element satisfying <code>p</code>,
-   *            or -1 if such an element does not exist
-   */
-  override def lastIndexWhere(p: A => Boolean, end: Int): Int = {
-    var i = 0
-    var these = this
-    var last = -1
-    while (!these.isEmpty && i <= end) {
-      if (p(these.head)) last = i
-    }
-    i
-  }
-
-  /** A list consisting of all elements of this list in reverse order.
-   */
-  override def reverse: List[A] = {
-    var result: List[A] = Nil
-    var these = this
-    while (!these.isEmpty) {
-      result = these.head :: result
-      these = these.tail
-    }
-    result
-  }
-}
-
diff --git a/src/library/scalax/collection/immutable/Vector.scala b/src/library/scalax/collection/immutable/Vector.scala
deleted file mode 100644
index 93e9601bd2..0000000000
--- a/src/library/scalax/collection/immutable/Vector.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-package scalax.collection.immutable
-
-import generic._
-import annotation.unchecked.uncheckedVariance
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *    // !!! todo: insert good immutable vector implementation here.
- *  @author  Matthias Zenger
- *  @autor   Martin Odersky
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait Vector[+A] extends Sequence[A]
-                    with VectorTemplate[Vector, A @uncheckedVariance]
-                    with collection.Vector[A]
-
-object Vector extends SequenceFactory[Vector] with EmptyIterableFactory[Vector] {
-  val empty: Vector[Nothing] = immutable.Vector.empty
-}
-
-
diff --git a/src/library/scalax/collection/mutable/Array.scala b/src/library/scalax/collection/mutable/Array.scala
deleted file mode 100755
index cf1e02008b..0000000000
--- a/src/library/scalax/collection/mutable/Array.scala
+++ /dev/null
@@ -1,410 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Array.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.collection.mutable
-
-import scalax.collection.generic._
-import compat.Platform.arraycopy
-
-/** This object contains utility methods operating on arrays.
- *
- *  @author Martin Odersky
- *  @version 1.0
- */
-object Array extends SequenceFactory[Array] {
-
-  /** Copy one array to another.
-   *  Equivalent to
-   *    <code>System.arraycopy(src, srcPos, dest, destPos, length)</code>,
-   *  except that this works also for polymorphic and boxed arrays.
-   *
-   *  @param src     ...
-   *  @param srcPos  ...
-   *  @param dest    ...
-   *  @param destPos ...
-   *  @param length  ...
-   */
-  def copy(src: AnyRef, srcPos: Int, dest: AnyRef, destPos: Int, length: Int) {
-    src match {
-      case xs: runtime.BoxedArray[_] =>
-        xs.copyTo(srcPos, dest, destPos, length)
-      case _ =>
-        dest match {
-          case xs: runtime.BoxedArray[_] =>
-            xs.copyFrom(src, srcPos, destPos, length)
-          case _ =>
-            def fillDest[T](da: Array[T], sa: Int=>T) {
-              var d = destPos
-              for (s <- srcPos to srcPos+length-1) {
-                da(d) = sa(s); d += 1
-              }
-            }
-            if (dest.isInstanceOf[Array[Any]]) {
-              def fill(sa: Int=>Any) = fillDest(dest.asInstanceOf[Array[Any]], sa)
-              src match {
-                case sa:Array[Int]     => fill(s=>Int.box(sa(s)))
-/*!!!
-                case sa:Array[Long]    => fill(s=>Long.box(sa(s)))
-                case sa:Array[Char]    => fill(s=>Char.box(sa(s)))
-                case sa:Array[Boolean] => fill(s=>Boolean.box(sa(s)))
-                case sa:Array[Byte]    => fill(s=>Byte.box(sa(s)))
-                case sa:Array[Short]   => fill(s=>Short.box(sa(s)))
-                case sa:Array[Double]  => fill(s=>Double.box(sa(s)))
-                case sa:Array[Float]   => fill(s=>Float.box(sa(s)))
-*/
-                case _ => arraycopy(src, srcPos, dest, destPos, length)
-              }
-            } else if (dest.isInstanceOf[Array[AnyVal]]) {
-              def fill(sa: Int=>AnyVal) = fillDest(dest.asInstanceOf[Array[AnyVal]], sa)
-              src match {
-                case sa:Array[Int]     => fill(sa(_))
-/*!!!
-                case sa:Array[Long]    => fill(sa(_))
-                case sa:Array[Char]    => fill(sa(_))
-                case sa:Array[Boolean] => fill(sa(_))
-                case sa:Array[Byte]    => fill(sa(_))
-                case sa:Array[Short]   => fill(sa(_))
-                case sa:Array[Double]  => fill(sa(_))
-                case sa:Array[Float]   => fill(sa(_))
-*/
-                case _ => arraycopy(src, srcPos, dest, destPos, length)
-              }
-            } else
-              arraycopy(src, srcPos, dest, destPos, length)
-        }
-    }
-  }
-
-  /** Concatenate all argument sequences into a single array.
-   *
-   *  @param xs the given argument sequences
-   *  @return   the array created from the concatenated arguments
-   */
-  def concat[T](xs: Seq[T]*): Array[T] = {
-    var len = 0
-    for (x <- xs) len += x.length
-    val result = new Array[T](len)
-    var start = 0
-    for (x <- xs) {
-      copy(x.toArray, 0, result, start, x.length)
-      start += x.length
-    }
-    result
-  }
-
-  /** Create an array with given elements.
-   *
-   *  @param xs the elements to put in the array
-   *  @return the array containing elements xs.
-   */
-  def apply[A](xs: A*): Array[A] = {
-    val array = new Array[A](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-/*!!! enable when arrays in Scala
-  def apply(xs: Boolean*): Array[Boolean] = {
-    val array = new Array[Boolean](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Byte*): Array[Byte] = {
-    val array = new Array[Byte](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Short*): Array[Short] = {
-    val array = new Array[Short](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Char*): Array[Char] = {
-    val array = new Array[Char](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Int*): Array[Int] = {
-    val array = new Array[Int](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Long*): Array[Long] = {
-    val array = new Array[Long](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Float*): Array[Float] = {
-    val array = new Array[Float](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Double*): Array[Double] = {
-    val array = new Array[Double](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def apply(xs: Unit*): Array[Unit] = {
-    val array = new Array[Unit](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-*/
-  /** Create an array containing several copies of an element.
-   *
-   *  @param n    the length of the resulting array
-   *  @param elem the element composing the resulting array
-   *  @return     an array composed of n elements all equal to elem
-   *  @deprecated use `Array.fill` instead.
-   */
-  @deprecated def make[A](n: Int, elem: A): Array[A] = {
-    val a = new Array[A](n)
-    var i = 0
-    while (i < n) {
-      a(i) = elem
-      i += 1
-    }
-    a
-  }
-
-  /** Create an array containing the values of a given function <code>f</code>
-   *  over given range <code>[0..n)</code>
-   *  @deprecated use `Array.tabulate` instead.
-   */
-  @deprecated def fromFunction[A](f: Int => A)(n: Int): Array[A] = {
-    val a = new Array[A](n)
-    var i = 0
-    while (i < n) {
-      a(i) = f(i)
-      i += 1
-    }
-    a
-  }
-
-  /** Create an array containing the values of a given function <code>f</code>
-   *  over given range <code>[0..n1, 0..n2)</code>
-   *  @deprecated use `Array.tabulate` instead.
-   */
-  @deprecated def fromFunction[A](f: (Int, Int) => A)(n1: Int, n2: Int): Array[Array[A]] =
-    fromFunction(i => fromFunction(f(i, _))(n2))(n1)
-
-  /** Create an array containing the values of a given function <code>f</code>
-   *  over given range <code>[0..n1, 0..n2, 0..n3)</code>
-   *  @deprecated use `Array.tabulate` instead.
-   */
-  @deprecated def fromFunction[A](f: (Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
-    fromFunction(i => fromFunction(f(i, _, _))(n2, n3))(n1)
-
-  /** Create an array containing the values of a given function <code>f</code>
-   *  over given range <code>[0..n1, 0..n2, 0..n3, 0..n4)</code>
-   *  @deprecated use `Array.tabulate` instead.
-   */
-  @deprecated def fromFunction[A](f: (Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
-    fromFunction(i => fromFunction(f(i, _, _, _))(n2, n3, n4))(n1)
-
-  /** Create an array containing the values of a given function <code>f</code>
-   *  over given range <code>[0..n1, 0..n2, 0..n3, 0..n4, 0..n5)</code>
-   *  @deprecated use `Array.tabulate` instead.
-   */
-  @deprecated def fromFunction[A](f: (Int, Int, Int, Int, Int) => A)(n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
-    fromFunction(i => fromFunction(f(i, _, _, _, _))(n2, n3, n4, n5))(n1)
-
-  /** Create array with given dimensions */
-  def ofDim[A](n1: Int): Array[A] =
-    new Array[A](n1)
-  def ofDim[A](n1: Int, n2: Int): Array[Array[A]] =
-    tabulate(n1)(_ => ofDim[A](n2))
-  def ofDim[A](n1: Int, n2: Int, n3: Int): Array[Array[Array[A]]] =
-    tabulate(n1)(_ => ofDim[A](n2, n3))
-  def ofDim[A](n1: Int, n2: Int, n3: Int, n4: Int): Array[Array[Array[Array[A]]]] =
-    tabulate(n1)(_ => ofDim[A](n2, n3, n4))
-  def ofDim[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int): Array[Array[Array[Array[Array[A]]]]] =
-    tabulate(n1)(_ => ofDim[A](n2, n3, n4, n5))
-}
-
-/** This class represents polymorphic arrays. <code>Array[T]</code> is Scala's representation
- *  for Java's <code>T[]</code>.
- *
- *  @author Martin Odersky
- *  @version 1.0
- */
-final class Array[A](_length: Int) extends Vector[A] with MutableVectorTemplate[Array, A] {
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead
-    */
-   @deprecated def this(dim1: Int, dim2: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int) = {
-     this(dim1);
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-   /** Multidimensional array creation
-    *  @deprecated use Array.ofDim instead */
-   @deprecated def this(dim1: Int, dim2: Int, dim3: Int, dim4: Int, dim5: Int, dim6: Int, dim7: Int, dim8: Int, dim9: Int) = {
-     this(dim1)
-     throw new Error()
-   }
-
-  /** The length of the array */
-  def length: Int = throw new Error()
-
-  /** The element at given index.
-   *  <p>
-   *    Indices start a <code>0</code>; <code>xs.apply(0)</code> is the first
-   *    element of array <code>xs</code>.
-   *  </p>
-   *  <p>
-   *    Note the indexing syntax <code>xs(i)</code> is a shorthand for
-   *    <code>xs.apply(i)</code>.
-   *  </p>
-   *
-   *  @param i   the index
-   *  @throws ArrayIndexOutOfBoundsException if <code>i < 0</code> or
-   *          <code>length <= i</code>
-   */
-  def apply(i: Int): A = throw new Error()
-
-  /* Create a new array builder */
-  def newBuilder[B]: Builder[Array, B] = throw new Error()
-
-  /** <p>
-   *    Update the element at given index.
-   *  </p>
-   *  <p>
-   *    Indices start a <code>0</code>; <code>xs.apply(0)</code> is the first
-   *    element of array <code>xs</code>.
-   *  </p>
-   *  <p>
-   *    Note the indexing syntax <code>xs(i) = x</code> is a shorthand
-   *    for <code>xs.update(i, x)</code>.
-   *  </p>
-   *
-   *  @param i   the index
-   *  @param x   the value to be written at index <code>i</code>
-   *  @throws ArrayIndexOutOfBoundsException if <code>i < 0</code> or
-   *          <code>length <= i</code>
-   */
-  override def update(i: Int, x: A) { throw new Error() }
-
-  /**
-   *  @return a deep string representation of this array.
-   */
-  def deepToString(): String = throw new Error()
-
-  /** <p>
-   *    Returns a string representation of this array object. The resulting string
-   *    begins with the string <code>start</code> and is finished by the string
-   *    <code>end</code>. Inside, the string representations of elements (w.r.t.
-   *    the method <code>deepToString()</code>) are separated by the string
-   *    <code>sep</code>. For example:
-   *  </p>
-   *  <p>
-   *    <code>Array(Array(1, 2), Array(3)).deepMkString("[", "; ", "]") = "[[1; 2]; [3]]"</code>
-   *  </p>
-   *
-   *  @param start starting string.
-   *  @param sep separator string.
-   *  @param end ending string.
-   *  @return a string representation of this array object.
-   */
-  def deepMkString(start: String, sep: String, end: String): String =
-    throw new Error()
-
-  /** Returns a string representation of this array object. The string
-   *  representations of elements (w.r.t. the method <code>deepToString()</code>)
-   *  are separated by the string <code>sep</code>.
-   *
-   *  @param sep separator string.
-   *  @return a string representation of this array object.
-   */
-  def deepMkString(sep: String): String = throw new Error()
-
-  /** <p>
-   *    Returns <code>true</code> if the two specified arrays are
-   *    <em>deeply equal</em> to one another.
-   *  </p>
-   *  <p>
-   *    Two array references are considered deeply equal if both are null,
-   *    or if they refer to arrays that contain the same number of elements
-   *    and all corresponding pairs of elements in the two arrays are deeply
-   *    equal.
-   *  </p>
-   *  <p>
-   *    See also method <code>deepEquals</code> in the Java class
-   *    <a href="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html"
-   *    target="_top">java.utils.Arrays</a>
-   *  </p>
-   *
-   *  @param that the second
-   *  @return     <code>true</code> iff both arrays are deeply equal.
-   */
-  def deepEquals(that: Any): Boolean = throw new Error()
-
-}
diff --git a/src/library/scalax/collection/mutable/ArrayBuffer.scala b/src/library/scalax/collection/mutable/ArrayBuffer.scala
deleted file mode 100644
index 1692280e21..0000000000
--- a/src/library/scalax/collection/mutable/ArrayBuffer.scala
+++ /dev/null
@@ -1,140 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ArrayBuffer.scala 15407 2008-06-20 09:26:36Z stepancheg $
-
-
-package scalax.collection.mutable
-
-import generic.{SequenceFactory, MutableVectorTemplate, Builder}
-
-/* Factory object for `ArrayBuffer` class */
-object ArrayBuffer extends SequenceFactory[ArrayBuffer] {
-  def apply[A](args: A*): ArrayBuffer[A] = new ArrayBuffer[A] ++ args.asInstanceOf[Iterable[A]] // !@!
-}
-
-/** An implementation of the <code>Buffer</code> class using an array to
- *  represent the assembled sequence internally. Append, update and random
- *  access take constant time (amortized time). Prepends and removes are
- *  linear in the buffer size.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
- */
-@serializable
-class ArrayBuffer[A](override protected val initialSize: Int)
-  extends Buffer[A]
-     with Vector[A]
-     with MutableVectorTemplate[ArrayBuffer, A]
-     with Builder[ArrayBuffer, A]
-     with ResizableArray[A] {
-
-  def this() = this(16)
-
-  def clear() { reduceToSize(0) }
-
-  override def newBuilder[B]: Builder[ArrayBuffer, B] = new ArrayBuffer[B]
-
-  /** Appends a single element to this buffer and returns
-   *  the identity of the buffer. It takes constant time.
-   *
-   *  @param elem  the element to append.
-   */
-  def +=(elem: A) {
-    ensureSize(size0 + 1)
-    array(size0) = elem.asInstanceOf[AnyRef]
-    size0 += 1
-  }
-
-  /** Appends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter  the iterfable object.
-   *  @return      the updated buffer.
-   */
-  override def ++=(iter: collection.Iterable[A]) = iter match {
-    case v: Vector[_] =>
-      val n = v.length
-      ensureSize(size0 + n)
-      v.copyToArray(array.asInstanceOf[scala.Array[Any]], n)
-    case _ =>
-      super.++=(iter)
-  }
-
-  /** Prepends a single element to this buffer and return
-   *  the identity of the buffer. It takes time linear in
-   *  the buffer size.
-   *
-   *  @param elem  the element to append.
-   *  @return      the updated buffer.
-   */
-  def +:(elem: A): this.type = {
-    ensureSize(size0 + 1)
-    copy(0, 1, size0)
-    array(0) = elem.asInstanceOf[AnyRef]
-    size0 += 1
-    this
-  }
-
-  /** Prepends a number of elements provided by an iterable object
-   *  via its <code>elements</code> method. The identity of the
-   *  buffer is returned.
-   *
-   *  @param iter  the iterable object.
-   *  @return      the updated buffer.
-   */
-  override def ++:(iter: Iterable[A]): this.type = { insertAll(0, iter); this }
-
-  /** Inserts new elements at the index <code>n</code>. Opposed to method
-   *  <code>update</code>, this method will not replace an element with a
-   *  one. Instead, it will insert a new element at index <code>n</code>.
-   *
-   *  @param n     the index where a new element will be inserted.
-   *  @param iter  the iterable object providing all elements to insert.
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  def insertAll(n: Int, iter: Iterable[A]) {
-    if ((n < 0) || (n > size0))
-      throw new IndexOutOfBoundsException(n.toString)
-    val xs = iter.elements.toList
-    val len = xs.length
-    ensureSize(size0 + len)
-    copy(n, n + len, size0 - n)
-    xs.copyToArray(array.asInstanceOf[scala.Array[Any]], n)
-    size0 += len
-  }
-
-  /** Removes the element on a given index position. It takes time linear in
-   *  the buffer size.
-   *
-   *  @param n  the index which refers to the first element to delete.
-   *  @param count   the number of elemenets to delete
-   *  @return   the updated array buffer.
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  def remove(n: Int, count: Int) {
-    if ((n < 0) || (n >= size0))
-      throw new IndexOutOfBoundsException(n.toString)
-    copy(n + count, n, size0 - (n + count))
-    size0 -= count
-  }
-
-  /** Return a clone of this buffer.
-   *
-   *  @return an <code>ArrayBuffer</code> with the same elements.
-   */
-  override def clone(): Buffer[A] = new ArrayBuffer[A] ++ this
-
-  def result: ArrayBuffer[A] = this
-
-  /** Defines the prefix of the string representation.
-   */
-  override def stringPrefix: String = "ArrayBuffer"
-}
diff --git a/src/library/scalax/collection/mutable/DefaultMapModel.scala b/src/library/scalax/collection/mutable/DefaultMapModel.scala
deleted file mode 100644
index fda7798e26..0000000000
--- a/src/library/scalax/collection/mutable/DefaultMapModel.scala
+++ /dev/null
@@ -1,44 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |                                         **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: DefaultMapModel.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.mutable
-
-/** This class is used internally. It implements the mutable <code>Map</code>
- *  class in terms of three functions: <code>findEntry</code>,
- *  <code>addEntry</code>, and <code>entries</code>.
- *
- *  @author  Matthias Zenger
- *  @version 1.0, 08/07/2003
- */
-trait DefaultMapModel[A, B] extends Map[A, B] {
-
-  type Entry = DefaultEntry[A, B]
-
-  protected def findEntry(key: A): Entry
-  protected def addEntry(e: Entry)
-  protected def entries: Iterator[Entry]
-
-  def get(key: A): Option[B] = {
-    val e = findEntry(key)
-    if (e == null) None
-    else Some(e.value);
-  }
-
-  def update(key: A, value: B): this.type = {
-    val e = findEntry(key)
-    if (e == null) addEntry(new Entry(key, value))
-    else e.value = value
-    this
-  }
-
-  def elements = entries map {e => (e.key, e.value)}
-}
-
diff --git a/src/library/scalax/collection/mutable/FlatHashTable.scala b/src/library/scalax/collection/mutable/FlatHashTable.scala
deleted file mode 100644
index c8fe2cede3..0000000000
--- a/src/library/scalax/collection/mutable/FlatHashTable.scala
+++ /dev/null
@@ -1,164 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: FlatHashTable.scala 16893 2009-01-13 13:09:22Z cunei $
-
-package scalax.collection.mutable
-
-trait FlatHashTable[A] {
-
-  /** The load factor for the hash table; must be < 500 (0.5)
-   */
-  protected def loadFactor: Int = 450
-  protected final def loadFactorDenum = 1000
-
-  /** The initial size of the hash table.
-   */
-  protected def initialSize: Int = 16
-
-  private final val tableDebug = false
-
-  /** The actual hash table.
-   */
-  protected var table: scala.Array[AnyRef] =
-    if (initialSize == 0) null else new scala.Array(initialSize)
-
-  /** The number of mappings contained in this hash table.
-   */
-  protected var tableSize = 0
-
-  /** The next size value at which to resize (capacity * load factor).
-   */
-  protected var threshold: Int = newThreshold(initialSize)
-
-  /** Returns the number of entires in this hash table.
-   */
-  def size: Int = tableSize
-
-  def findEntry(elem: A): Option[A] = {
-    var h = index(elemHashCode(elem))
-    var entry = table(h)
-    while (null != entry && entry != elem) {
-      h = (h + 1) % table.length
-      entry = table(h)
-    }
-    if (null == entry) None else Some(entry.asInstanceOf[A])
-  }
-
-  def containsEntry(elem: A): Boolean = {
-    var h = index(elemHashCode(elem))
-    var entry = table(h)
-    while (null != entry && entry != elem) {
-      h = (h + 1) % table.length
-      entry = table(h)
-    }
-    null != entry
-  }
-
-  def addEntry(elem: A) : Boolean = {
-    var h = index(elemHashCode(elem))
-    var entry = table(h)
-    while (null != entry) {
-      if (entry == elem) return false
-      h = (h + 1) % table.length
-      entry = table(h)
-    }
-    table(h) = elem.asInstanceOf[AnyRef]
-    tableSize = tableSize + 1
-    if (tableSize >= threshold) growTable()
-    true
-  }
-
-  def removeEntry(elem: A) : Option[A] = {
-    if (tableDebug) checkConsistent()
-    def precedes(i: Int, j: Int) = {
-      val d = table.length >> 1
-      if (i <= j) j - i < d
-      else i - j > d
-    }
-    var h = index(elemHashCode(elem))
-    var entry = table(h)
-    while (null != entry) {
-      if (entry == elem) {
-        var h0 = h
-        var h1 = (h0 + 1) % table.length
-        while (null != table(h1)) {
-          val h2 = index(elemHashCode(table(h1).asInstanceOf[A]))
-          //Console.println("shift at "+h1+":"+table(h1)+" with h2 = "+h2+"? "+(h2 != h1)+precedes(h2, h0)+table.length)
-          if (h2 != h1 && precedes(h2, h0)) {
-            //Console.println("shift "+h1+" to "+h0+"!")
-            table(h0) = table(h1)
-            h0 = h1
-          }
-          h1 = (h1 + 1) % table.length
-        }
-        table(h0) = null
-        tableSize -= 1
-        if (tableDebug) checkConsistent()
-        return Some(entry.asInstanceOf[A])
-      }
-      h = (h + 1) % table.length
-      entry = table(h)
-    }
-    None
-  }
-
-  def elements = new Iterator[A] {
-    private var i = 0
-    def hasNext: Boolean = {
-      while (i < table.length && (null == table(i))) i += 1;
-      i < table.length
-    }
-    def next(): A =
-      if (hasNext) { i += 1; table(i - 1).asInstanceOf[A] }
-      else Iterator.empty.next
-  }
-
-  private def growTable() {
-    val oldtable = table
-    table = new scala.Array[AnyRef](table.length * 2)
-    tableSize = 0
-    threshold = newThreshold(table.length)
-    var i = 0
-    while (i < oldtable.length) {
-      val entry = oldtable(i)
-      if (null != entry) addEntry(entry.asInstanceOf[A])
-      i += 1
-    }
-    if (tableDebug) checkConsistent()
-  }
-
-  private def checkConsistent() {
-    for (i <- 0 until table.length)
-      if (table(i) != null && !containsEntry(table(i).asInstanceOf[A]))
-        assert(false, i+" "+table(i)+" "+table.toString)
-  }
-
-  protected def elemHashCode(elem: A) = elem.hashCode()
-
-  protected final def improve(hcode: Int) = {
-    var h: Int = hcode + ~(hcode << 9)
-    h = h ^ (h >>> 14)
-    h = h + (h << 4)
-    h ^ (h >>> 10)
-  }
-
-  protected final def index(hcode: Int) = improve(hcode) & (table.length - 1)
-
-  private def newThreshold(size: Int) = {
-    val lf = loadFactor
-    assert(lf < (loadFactorDenum / 2), "loadFactor too large; must be < 0.5")
-    (size.toLong * lf / loadFactorDenum ).toInt
-  }
-
-  protected def clear() {
-    var i = table.length - 1
-    while (i >= 0) { table(i) = null; i -= 1 }
-    tableSize = 0
-  }
-}
diff --git a/src/library/scalax/collection/mutable/HashMap.scala b/src/library/scalax/collection/mutable/HashMap.scala
deleted file mode 100644
index 4d3342636c..0000000000
--- a/src/library/scalax/collection/mutable/HashMap.scala
+++ /dev/null
@@ -1,43 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashMap.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.mutable
-
-import generic._
-
-/** This class implements mutable maps using a hashtable.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
- */
-object HashMap  extends MapFactory[HashMap] {
-
-  /** The empty map of this type */
-  def empty[A, B] = new HashMap[A, B]
-
-}
-
-@serializable
-class HashMap[A, B]
-  extends Map[A, B]
-     with MapTemplate[A, B, HashMap]
-     with HashTable[A]
-     with DefaultMapModel[A, B] {
-
-  def empty[B] = HashMap.empty[A, B]
-
-  def -= (key: A) { removeEntry(key) }
-
-  override def clear() = super.clear()
-
-  override def clone(): Map[A, B] = new HashMap[A, B] ++ this
-}
diff --git a/src/library/scalax/collection/mutable/HashSet.scala b/src/library/scalax/collection/mutable/HashSet.scala
deleted file mode 100644
index 601d0885c0..0000000000
--- a/src/library/scalax/collection/mutable/HashSet.scala
+++ /dev/null
@@ -1,48 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashSet.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.mutable
-
-import generic.{SetTemplate, SetFactory, AddableBuilder}
-
-/** Factory object for `HashSet` class */
-object HashSet extends SetFactory[HashSet] {
-  /** The empty set of this type */
-  def empty[A] = new HashSet[A]
-}
-
-/** This class implements mutable sets using a hashtable.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-@serializable
-class HashSet[A]
-  extends Set[A]
-     with SetTemplate[HashSet, A]
-     with FlatHashTable[A] {
-
-  def contains(elem: A): Boolean = containsEntry(elem)
-
-  def +=(elem: A) { addEntry(elem) }
-
-  def -=(elem: A) { removeEntry(elem) }
-
-  override def clear() = super.clear()
-
-  override def newBuilder[B]: generic.Builder[HashSet, B] =
-    new AddableBuilder[HashSet, B](HashSet.empty)
-
-  override def clone(): HashSet[A] = new HashSet[A] ++ this
-}
-
-
diff --git a/src/library/scalax/collection/mutable/HashTable.scala b/src/library/scalax/collection/mutable/HashTable.scala
deleted file mode 100644
index 73ff61f3df..0000000000
--- a/src/library/scalax/collection/mutable/HashTable.scala
+++ /dev/null
@@ -1,172 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: HashTable.scala 16884 2009-01-09 16:52:09Z cunei $
-
-
-package scalax.collection.mutable
-
-/** This class can be used to construct data structures that are based
- *  on hashtables. Class <code>HashTable[A]</code> implements a hashtable
- *  that maps keys of type <code>A</code> to values of the fully abstract
- *  member type <code>Entry</code>. Classes that make use of <code>HashTable</code>
- *  have to provide an implementation for <code>Entry</code>
- *
- *  There are mainly two parameters that affect the performance of a hashtable:
- *  the <i>initial size</i> and the <i>load factor</i>. The <i>size</i>
- *  refers to the number of <i>buckets</i> in the hashtable, and the <i>load
- *  factor</i> is a measure of how full the hashtable is allowed to get before
- *  its size is automatically doubled. Both parameters may be changed by
- *  overriding the corresponding values in class <code>HashTable</code>.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.0, 31/12/2006
- */
-trait HashTable[A] extends AnyRef {
-
-  protected type Entry >: Null <: HashEntry[A, Entry]
-
-  /** The load factor for the hash table (in 0.001 step).
-   */
-  protected def loadFactor: Int = 750 // corresponds to 75%
-  protected final val loadFactorDenum = 1000;
-
-  /** The initial size of the hash table.
-   */
-  protected def initialSize: Int = 16
-
-  /** The initial threshold
-   */
-  protected def initialThreshold: Int = newThreshold(initialSize)
-
-  /** The actual hash table.
-   */
-  protected var table: scala.Array[HashEntry[A, Entry]] =
-    if (initialSize == 0) null else new scala.Array(initialSize)
-
-  /** The number of mappings contained in this hash table.
-   */
-  protected var tableSize: Int = 0
-
-  /** The next size value at which to resize (capacity * load factor).
-   */
-  protected var threshold: Int = initialThreshold
-
-  /** Returns the size of this hash table.
-   */
-  def size = tableSize
-
-  protected def findEntry(key: A): Entry = {
-    val h = index(elemHashCode(key))
-    var e = table(h).asInstanceOf[Entry]
-    while (e != null && !elemEquals(e.key, key)) e = e.next
-    e
-  }
-
-  protected def addEntry(e: Entry) {
-    val h = index(elemHashCode(e.key))
-    e.next = table(h).asInstanceOf[Entry]
-    table(h) = e
-    tableSize = tableSize + 1
-    if (tableSize > threshold)
-      resize(2 * table.length)
-  }
-
-  protected def removeEntry(key: A) : Option[Entry] = {
-    val h = index(elemHashCode(key))
-    var e = table(h).asInstanceOf[Entry]
-    if (e != null) {
-      if (elemEquals(e.key, key)) {
-        table(h) = e.next
-        tableSize = tableSize - 1
-        return Some(e)
-      } else {
-        var e1 = e.next
-        while (e1 != null && !elemEquals(e1.key, key)) {
-          e = e1
-          e1 = e1.next
-        }
-        if (e1 != null) {
-          e.next = e1.next
-          tableSize = tableSize - 1
-          return Some(e1)
-        }
-      }
-    }
-    None
-  }
-
-  protected def entries: Iterator[Entry] = new Iterator[Entry] {
-    val iterTable = table
-    var idx = table.length - 1
-    var es = iterTable(idx).asInstanceOf[Entry]
-    scan()
-    def hasNext = es != null
-    def next = {
-      val res = es
-      es = es.next
-      scan()
-      res
-    }
-    def scan() {
-      while (es == null && idx > 0) {
-        idx = idx - 1
-        es = iterTable(idx).asInstanceOf[Entry]
-      }
-    }
-  }
-
-  def clear() {
-    var i = table.length - 1
-    while (i >= 0) { table(i) = null; i = i - 1 }
-    tableSize = 0
-  }
-
-  private def newThreshold(size: Int) =
-    ((size.toLong * loadFactor)/loadFactorDenum).toInt
-
-  private def resize(newSize: Int) = {
-    val oldTable = table
-    table = new scala.Array(newSize)
-    var i = oldTable.length - 1
-    while (i >= 0) {
-      var e = oldTable(i)
-      while (e != null) {
-        val h = index(elemHashCode(e.key))
-        val e1 = e.next
-        e.next = table(h).asInstanceOf[Entry]
-        table(h) = e
-        e = e1
-      }
-      i = i - 1
-    }
-    threshold = newThreshold(newSize)
-  }
-
-  protected def elemEquals(key1: A, key2: A): Boolean = (key1 == key2)
-
-  protected def elemHashCode(key: A) = key.hashCode()
-
-  protected final def improve(hcode: Int) = {
-    var h: Int = hcode + ~(hcode << 9)
-    h = h ^ (h >>> 14)
-    h = h + (h << 4)
-    h ^ (h >>> 10)
-  }
-
-  protected final def index(hcode: Int) = improve(hcode) & (table.length - 1)
-}
-
-trait HashEntry[A, E] {
-  val key: A
-  var next: E = _
-}
-
-
-
diff --git a/src/library/scalax/collection/mutable/Iterable.scala b/src/library/scalax/collection/mutable/Iterable.scala
deleted file mode 100755
index 0872c3c549..0000000000
--- a/src/library/scalax/collection/mutable/Iterable.scala
+++ /dev/null
@@ -1,32 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2008, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.mutable
-
-import generic._
-
-/** Collection classes mixing in this class provide a method
- *  <code>elements</code> which returns an iterator over all the
- *  elements contained in the collection.
- *
- *  @note If a collection has a known <code>size</code>, it should also sub-type <code>SizedIterable</code>.
- *
- *  @author  Matthias Zenger
- *  @autor   Martin Odersky
- *  @owner   Martin Odersky
- *  @version 2.8
- */
-trait Iterable[A] extends collection.Iterable[A] with IterableTemplate[Iterable, A]
-
-/* Factory object for `Iterable` class */
-object Iterable extends IterableFactory[Iterable] {
-  /** The empty iterable */
-  def apply[A](args: A*): Iterable[A] = ArrayBuffer.apply(args: _*) // !!! swicth to Array?
-}
diff --git a/src/library/scalax/collection/mutable/ListBuffer.scala b/src/library/scalax/collection/mutable/ListBuffer.scala
deleted file mode 100644
index faf897aef2..0000000000
--- a/src/library/scalax/collection/mutable/ListBuffer.scala
+++ /dev/null
@@ -1,314 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
-
-
-package scalax.collection.mutable
-
-import generic._
-import immutable.List
-import collection.immutable.{List, Nil, ::}
-
-/* Factory object for `ListBuffer` class */
-object ListBuffer extends SequenceFactory[ListBuffer] {
-  def apply[A](args: A*): ListBuffer[A] = new ListBuffer[A]
-}
-
-/** A Buffer implementation back up by a list. It provides constant time
- *  prepend and append. Most other operations are linear.
- *
- *  @author  Matthias Zenger
- *  @author  Martin Odersky
- *  @version 2.8
- */
-@serializable
-final class ListBuffer[A]
-      extends Buffer[A]
-         with SequenceTemplate[ListBuffer, A]
-         with Addable[ListBuffer[A], A]
-         with Subtractable[ListBuffer[A], A]
-         with Builder[List, A]
-         with SequenceForwarder[A]
-{
-  import collection.immutable.Sequence
-
-  private var start: List[A] = Nil
-  private var last0: ::[A] = _
-  private var exported: Boolean = false
-  private var len = 0
-
-  protected def underlying: Sequence[A] = start
-
-  override def newBuilder[B]: Builder[ListBuffer, B] =
-    new AddableBuilder[ListBuffer, B](new ListBuffer[B]) // !!! Adriaan: inference failure here
-
-  /** The current length of the buffer
-   */
-  override def length = len
-
-  // Implementations of abstract methods in Buffer
-
-  /** Replaces element at index <code>n</code> with the new element
-   *  <code>newelem</code>. Takes time linear in the buffer size. (except the first
-   *  element, which is updated in constant time).
-   *
-   *  @param n  the index of the element to replace.
-   *  @param x  the new element.
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  def update(n: Int, x: A) {
-    try {
-      if (exported) copy()
-      if (n == 0) {
-        val newElem = new :: (x, start.tail);
-        if (last0 eq start) {
-          last0 = newElem
-          len += 1
-        }
-        start = newElem
-      } else {
-        var cursor = start
-        var i = 1
-        while (i < n) {
-          cursor = cursor.tail
-          i += 1
-        }
-        val newElem = new :: (x, cursor.tail.tail)
-        if (last0 eq cursor.tail) {
-          last0 = newElem
-          len += 1
-        }
-        cursor.asInstanceOf[::[A]].tl = newElem
-      }
-    } catch {
-      case ex: Exception => throw new IndexOutOfBoundsException(n.toString())
-    }
-  }
-
-  /** Appends a single element to this buffer. This operation takes constant time.
-   *
-   *  @param x  the element to append.
-   */
-  def += (x: A) {
-    if (exported) copy()
-    if (start.isEmpty) {
-      last0 = new :: (x, Nil)
-      start = last0
-    } else {
-      val last1 = last0
-      last0 = new :: (x, Nil)
-      last1.tl = last0
-    }
-    len += 1
-  }
-
-  /** Clears the buffer contents.
-   */
-  def clear() {
-    start = Nil
-    exported = false
-    len = 0
-  }
-
-  /** Prepends a single element to this buffer. This operation takes constant
-   *  time.
-   *
-   *  @param x  the element to prepend.
-   *  @return   this buffer.
-   */
-  def +: (x: A): this.type = {
-    if (exported) copy()
-    val newElem = new :: (x, start)
-    if (start.isEmpty) last0 = newElem
-    start = newElem
-    len += 1
-    this
-  }
-
-  /** Inserts new elements at the index <code>n</code>. Opposed to method
-   *  <code>update</code>, this method will not replace an element with a new
-   *  one. Instead, it will insert a new element at index <code>n</code>.
-   *
-   *  @param  n     the index where a new element will be inserted.
-   *  @param  iter  the iterable object providing all elements to insert.
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  def insertAll(n: Int, iter: Iterable[A]) {
-    try {
-      if (exported) copy()
-      var elems = iter.elements.toList.reverse
-      len += elems.length
-      if (n == 0) {
-        while (!elems.isEmpty) {
-          val newElem = new :: (elems.head, start)
-          if (start.isEmpty) last0 = newElem
-          start = newElem
-          elems = elems.tail
-        }
-      } else {
-        var cursor = start
-        var i = 1
-        while (i < n) {
-          cursor = cursor.tail
-          i += 1
-        }
-        while (!elems.isEmpty) {
-          val newElem = new :: (elems.head, cursor.tail)
-          if (cursor.tail.isEmpty) last0 = newElem
-          cursor.asInstanceOf[::[A]].tl = newElem
-          elems = elems.tail
-        }
-      }
-    } catch {
-      case ex: Exception =>
-        throw new IndexOutOfBoundsException(n.toString())
-    }
-  }
-
-  /** Removes a given number of elements on a given index position. May take time linear in
-   *  the buffer size.
-   *
-   *  @param n         the index which refers to the first element to remove.
-   *  @param count     the number of elements to remove.
-   */
-  def remove(n: Int, count: Int) {
-    if (exported) copy()
-    val n1 = n max 0
-    val count1 = count min (len - n1)
-    var old = start.head;
-    if (n1 == 0) {
-      var c = count1
-      while (c > 0) {
-        start = start.tail
-        c -= 1
-      }
-    } else {
-      var cursor = start
-      var i = 1
-      while (i < n1) {
-        cursor = cursor.tail
-        i += 1
-      }
-      var c = count1
-      while (c > 0) {
-        if (last0 eq cursor.tail) last0 = cursor.asInstanceOf[::[A]]
-        cursor.asInstanceOf[::[A]].tl = cursor.tail.tail
-        c -= 1
-      }
-    }
-    len -= count1
-  }
-
-// Implementation of abstract method in Builder
-
-  def result = toList
-
-  /** Converts this buffer to a list. Takes constant time. The buffer is
-   *  copied lazily, the first time it is mutated.
-   */
-  override def toList: List[A] = {
-    exported = !start.isEmpty
-    start
-  }
-
-// New methods in ListBuffer
-
-  /** Prepends the elements of this buffer to a given list
-   *
-   *  @param xs   the list to which elements are prepended
-   */
-  def prependToList(xs: List[A]): List[A] =
-    if (start.isEmpty) xs
-    else { last0.tl = xs; toList }
-
-// Overrides of methods in Buffer
-
-  /** Removes the element on a given index position. May take time linear in
-   *  the buffer size
-   *
-   *  @param  n  the index which refers to the element to delete.
-   *  @return n  the element that was formerly at position <code>n</code>.
-   *  @pre       an element exists at position <code>n</code>
-   *  @throws Predef.IndexOutOfBoundsException if <code>n</code> is out of bounds.
-   */
-  override def remove(n: Int): A = try {
-    if (n < 0 || n >= len) throw new IndexOutOfBoundsException(n.toString())
-    if (exported) copy()
-    var old = start.head;
-    if (n == 0) {
-      start = start.tail
-    } else {
-      var cursor = start
-      var i = 1
-      while (i < n) {
-        cursor = cursor.tail
-        i += 1
-      }
-      old = cursor.tail.head
-      if (last0 eq cursor.tail) last0 = cursor.asInstanceOf[::[A]]
-      cursor.asInstanceOf[::[A]].tl = cursor.tail.tail
-    }
-    len -= 1
-    old
-  }
-
-  /** Remove a single element from this buffer. May take time linear in the buffer size.
-   *
-   *  @param x  the element to remove.
-   */
-  override def -= (elem: A) {
-    if (exported) copy()
-    if (start.isEmpty) {}
-    else if (start.head == elem) {
-      start = start.tail
-      len -= 1
-    } else {
-      var cursor = start
-      while (!cursor.tail.isEmpty && cursor.tail.head != elem) {
-        cursor = cursor.tail
-      }
-      if (!cursor.tail.isEmpty) {
-        val z = cursor.asInstanceOf[::[A]]
-        if (z.tl == last0)
-          last0 = z
-        z.tl = cursor.tail.tail
-        len -= 1
-      }
-    }
-  }
-
-  /** expose the underlying list but do not mark it as exported */
-  def readOnly: List[A] = start
-
-  // Private methods
-
-  /** Copy contents of this buffer */
-  private def copy() {
-    var cursor = start
-    val limit = last0.tail
-    clear
-    while (cursor ne limit) {
-      this += cursor.head
-      cursor = cursor.tail
-    }
-  }
-
-  /** Returns a clone of this buffer.
-   *
-   *  @return a <code>ListBuffer</code> with the same elements.
-   */
-  override def clone(): Buffer[A] = (new ListBuffer[A]) ++ this
-
-  /** Defines the prefix of the string representation.
-   *
-   *  @return the string representation of this buffer.
-   */
-  override def stringPrefix: String = "ListBuffer"
-}
-
diff --git a/src/library/scalax/collection/mutable/Map.scala b/src/library/scalax/collection/mutable/Map.scala
deleted file mode 100755
index 82fb6a5680..0000000000
--- a/src/library/scalax/collection/mutable/Map.scala
+++ /dev/null
@@ -1,73 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Map.scala 16884 2009-01-09 16:52:09Z cunei $
-
-
-package scalax.collection.mutable
-
-import generic._
-
-/* Factory object for `Map` class */
-object Map extends MapFactory[Map] {
-  def empty[A, B]: Map[A, B] = new HashMap[A, B]
-}
-
-trait Map[A, B]
-  extends collection.Map[A, B]
-     with MapTemplate[A, B, Map]
-     with Growable[(A, B)]
-     with Shrinkable[A]
-     with Cloneable[Map[A, B]] {
-self =>
-
-  /** This method allows one to add a new mapping from <code>key</code>
-   *  to <code>value</code> to the map. If the map already contains a
-   *  mapping for <code>key</code>, it will be overridden by this
-   *  function.
-   *
-   * @param key    The key to update
-   * @param value  The new value
-   */
-  def update(key: A, value: B): this.type
-
-  /** Add a key/value pair to this map.
-   *  @param    kv the key/value pair.
-   */
-  def += (kv: (A, B)) { update(kv._1, kv._2) }
-
-  /** Remove a key from this map, noop if key is not present.
-   *  @param    key the key to be removed
-   */
-  def -= (key: A)
-
-  def -(key: A): this.type = { -=(key); this }
-
-  /** Removes all elements from the set for
-   *  which the predicate <code>p</code> yields the value <code>false</code>.
-   */
-  def retain(p: A => Boolean): Unit = for ((k, v) <- this) if (!p(k)) -=(k)
-
-  /** Removes all elements from the set. After this operation is completed,
-   *  the set will be empty.
-   */
-  def clear() { for ((k, v) <- elements) -=(k) }
-
-  override def clone(): Map[A, B] = empty[B] ++ this
-
-  /** Return a read-only projection of this set !!! just us an (immutable) setProxy? */
-  def readOnly : collection.Map[A, B] = new collection.Map[A, B] {
-    override def size = self.size
-    override def update(key: A, value: B) = self.update(key, value)
-    override def - (elem: A) = self - elem
-    override def elements = self.elements
-    override def foreach(f: ((A, B)) => Unit) = self.foreach(f)
-    override def empty[C] = self.empty[C]
-    def get(key: A) = self.get(key)
-  }
-}
diff --git a/src/library/scalax/collection/mutable/OrderedIterable.scala b/src/library/scalax/collection/mutable/OrderedIterable.scala
deleted file mode 100755
index 90ef8018c7..0000000000
--- a/src/library/scalax/collection/mutable/OrderedIterable.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2008, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.mutable
-
-import generic._
-
-trait OrderedIterable[A] extends Iterable[A] with collection.OrderedIterable[A] with OrderedIterableTemplate[OrderedIterable, A]
-
-/* Factory object for `OrderedIterable` class */
-object OrderedIterable extends IterableFactory[OrderedIterable] {
-  /** The empty iterable */
-  def apply[A](args: A*): OrderedIterable[A] = ArrayBuffer.apply(args: _*) // !!! swicth to Array?
-}
-
diff --git a/src/library/scalax/collection/mutable/ResizableArray.scala b/src/library/scalax/collection/mutable/ResizableArray.scala
deleted file mode 100644
index 11c3659712..0000000000
--- a/src/library/scalax/collection/mutable/ResizableArray.scala
+++ /dev/null
@@ -1,108 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ResizableArray.scala 15407 2008-06-20 09:26:36Z stepancheg $
-
-
-package scalax.collection.mutable
-
-/** This class is used internally to implement data structures that
- *  are based on resizable arrays.
- *
- *  @author  Matthias Zenger, Burak Emir
- *  @version 1.0, 03/05/2004
- */
-trait ResizableArray[A] extends Vector[A] {
-
-  import scala.Array // !!!
-
-  protected def initialSize: Int = 16
-  protected var array: Array[AnyRef] = new Array[AnyRef](initialSize min 1)
-
-  protected var size0: Int = 0
-
-  //##########################################################################
-  // implement/override methods of Vector[A]
-
-  /** Returns the length of this resizable array.
-   */
-  def length: Int = size0
-
-  def apply(idx: Int) = {
-    if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
-    array(idx).asInstanceOf[A]
-  }
-
-  def update(idx: Int, elem: A) {
-    if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
-    array(idx) = elem.asInstanceOf[AnyRef]
-  }
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.
-   *
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   */
-  override def copyToArray[B >: A](xs: Array[B], start: Int) {
-    Array.copy(array, 0, xs, start, size0)
-  }
-
-  /** Copy all elements to a buffer
-   *  @param   The buffer to which elements are copied
-   */
-  override def copyToBuffer[B >: A](dest: Buffer[B]) {
-    dest ++= array.asInstanceOf[Iterable[A]] // !@!
-  }
-
-  override def foreach(f: A => Unit) {
-    var i = 0
-    while (i < size) {
-      f(array(i).asInstanceOf[A])
-      i += 1
-    }
-  }
-
-  //##########################################################################
-
-  /** remove elements of this array at indices after <code>sz</code>
-   */
-  def reduceToSize(sz: Int) {
-    require(sz <= size0)
-    while (size0 > sz) {
-      size0 -= 1
-      array(size0) = null
-    }
-  }
-
-  /** ensure that the internal array has at n cells */
-  protected def ensureSize(n: Int) {
-    if (n > array.length) {
-      var newsize = array.length * 2
-      while (n > newsize)
-        newsize = newsize * 2
-      val newar: Array[AnyRef] = new Array(newsize)
-      Array.copy(array, 0, newar, 0, size0)
-      array = newar
-    }
-  }
-
-  /** Swap two elements of this array.
-   */
-  protected def swap(a: Int, b: Int) {
-    val h = array(a)
-    array(a) = array(b)
-    array(b) = h
-  }
-
-  /** Move parts of the array.
-   */
-  protected def copy(m: Int, n: Int, len: Int) {
-    Array.copy(array, m, array, n, len)
-  }
-}
diff --git a/src/library/scalax/collection/mutable/Sequence.scala b/src/library/scalax/collection/mutable/Sequence.scala
deleted file mode 100755
index c4d72231d5..0000000000
--- a/src/library/scalax/collection/mutable/Sequence.scala
+++ /dev/null
@@ -1,23 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2008, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
-
-package scalax.collection.mutable
-
-import generic._
-
-trait Sequence[A] extends OrderedIterable[A] with collection.Sequence[A] with SequenceTemplate[Sequence, A]
-
-/* Factory object for `Sequence` class */
-object Sequence extends SequenceFactory[Sequence] {
-  /** The empty sequence */
-  def apply[A](args: A*): Sequence[A] = ArrayBuffer.apply(args: _*) // !!! swicth to Array?
-}
-
-
diff --git a/src/library/scalax/collection/mutable/Set.scala b/src/library/scalax/collection/mutable/Set.scala
deleted file mode 100644
index 78f3234336..0000000000
--- a/src/library/scalax/collection/mutable/Set.scala
+++ /dev/null
@@ -1,119 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Set.scala 16893 2009-01-13 13:09:22Z cunei $
-
-
-package scalax.collection.mutable
-
-import collection.generic._
-
-/** The canonical factory methods for <a href="Set.html">mutable sets</a>.
- *  Currently these return <a href="HashSet.html">HashSet's</a>.
- */
-object Set extends generic.SetFactory[Set] {
-  /** The empty map of this type; this is implemented as a hashtable */
-  def empty[A]: Set[A] = new HashSet[A]
-}
-
-/** This class represents mutable sets. Concrete set implementations
- *  just have to provide functionality for the abstract methods in
- *  <a href="../Set.html" target="contentFrame">
- *  <code>scala.collection.Set</code></a> as well as for <code>+=</code>,
- *  <code>-= and <code>clear</code>.
- *
- *  @author Matthias Zenger
- *  @author Martin Odersky
- *  @version 2.8
- */
-trait Set[A] extends collection.Set[A]
-                with SetTemplate[Set, A]
-                with Addable[Set[A], A]
-                with Subtractable[Set[A], A]
-                with Growable[A]
-                with Shrinkable[A]
-                with Cloneable[Set[A]] {
-self =>
-
-  /** This method allows one to add or remove an element <code>elem</code>
-   *  from this set depending on the value of parameter <code>included</code>.
-   *  Typically, one would use the following syntax:
-   *  <pre>set(elem) = true</pre>
-   *
-   */
-  def update(elem: A, included: Boolean) {
-    if (included) this += elem else this -= elem
-  }
-
-  /** Adds a new element to the set.
-   *
-   *  @param elem the element to be added
-   */
-  def +=(elem: A)
-
-  /** Removes a single element from a set.
-   *  @param elem  The element to be removed.
-   */
-  def -=(elem: A)
-
-  /** Adds a new element to the set and returns the set itself.
-   *
-   *  @param elem the element to be added
-   */
-  def +(elem: A): this.type = { +=(elem); this }
-
-  /** Removed a new element from the set and returns the set itself.
-   *
-   *  @param elem the element to be added
-   */
-  def -(elem: A): this.type = { -=(elem); this }
-
-  /** This method computes an intersection with set <code>that</code>.
-   *  It removes all the elements that are not present in <code>that</code>.
-   *
-   *  @param that the set to intersect with.
-   */
-  def intersect(that: Set[A]) { retain(that.contains) }
-
-  /** Method <code>retain removes all elements from the set for
-   *  which the predicate <code>p</code> yields the value <code>false</code>.
-   */
-  def retain(p: A => Boolean): Unit = foreach (elem => if (!p(elem)) -=(elem))
-
-  /** Removes all elements from the set. After this operation is completed,
-   *  the set will be empty.
-   */
-  def clear() { foreach(-=) }
-
-  override def clone(): Set[A] = { val b = newBuilder[A]; b ++= this; b.result }
-
-  /** Send a message to this scriptable object.
-   *
-   *  @param cmd  the message to send.
-   *  @throws <code>Predef.UnsupportedOperationException</code>
-   *  if the message was not understood.
-   def <<(cmd: Message[A]): Unit = cmd match {
-    case Include(elem) => this += elem
-    case Remove(elem) => this -= elem
-    case Reset() => clear
-    case s: Script[_] => s.elements foreach <<
-    case _ => throw new UnsupportedOperationException("message " + cmd + " not understood")
-  }
-   */
-
-  /** Return a read-only projection of this set !!! just us an (immutable) setProxy? */
-  def readOnly : collection.Set[A] = new collection.Set[A] {
-    def contains(item : A) = Set.this.contains(item)
-    override def size = self.size
-    override def +(elem: A) = self + elem
-    override def -(elem: A) = self - elem
-    override def elements = self.elements
-    override def foreach(f: A => Unit) = self.foreach(f)
-    override def newBuilder[B]: Builder[collection.Set, B] = self.newBuilder[B]
-  }
-}
diff --git a/src/library/scalax/collection/mutable/Vector.scala b/src/library/scalax/collection/mutable/Vector.scala
deleted file mode 100644
index 1813172fbf..0000000000
--- a/src/library/scalax/collection/mutable/Vector.scala
+++ /dev/null
@@ -1,21 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Vector.scala 15437 2008-06-25 16:22:45Z stepancheg $
-
-package scalax.collection.mutable
-
-import generic._
-
-trait Vector[A] extends Sequence[A] with collection.Vector[A] with MutableVectorTemplate[Vector, A]
-
-/* Factory object for `Vector` class */
-object Vector extends SequenceFactory[Vector] {
-  /** The empty vector */
-  def apply[A](args: A*): Vector[A] = ArrayBuffer.apply(args: _*) // !!! swicth to Array?
-}
diff --git a/src/library/scalax/runtime/BoxedAnyArray.scala b/src/library/scalax/runtime/BoxedAnyArray.scala
deleted file mode 100755
index 6e14cafdfc..0000000000
--- a/src/library/scalax/runtime/BoxedAnyArray.scala
+++ /dev/null
@@ -1,239 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedAnyArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-import compat.Platform
-
-/**
- * Arrays created by <code>new Array[T](length)</code> where <code>T</code>
- * is a type variable.
- *
- * @author Martin Odersky
- */
-@serializable
-final class BoxedAnyArray[A](val length: Int) extends BoxedArray[A] {
-
-  private var boxed = new Array[AnyRef](length)
-  private val hash = boxed.hashCode()
-  private var unboxed: AnyRef = null
-  private var elemClass: Class[_] = null
-
-  def apply(index: Int): A = synchronized {
-    if (unboxed eq null)
-      boxed(index)
-    else if (elemClass eq classOf[Int])
-      Int.box(unboxed.asInstanceOf[Array[Int]](index))
-    else if (elemClass eq classOf[Double])
-      Double.box(unboxed.asInstanceOf[Array[Double]](index))
-    else if (elemClass eq classOf[Float])
-      Float.box(unboxed.asInstanceOf[Array[Float]](index))
-    else if (elemClass eq classOf[Long])
-      Long.box(unboxed.asInstanceOf[Array[Long]](index))
-    else if (elemClass eq classOf[Char])
-      Char.box(unboxed.asInstanceOf[Array[Char]](index))
-    else if (elemClass eq classOf[Byte])
-      Byte.box(unboxed.asInstanceOf[Array[Byte]](index))
-    else if (elemClass eq classOf[Short])
-      Short.box(unboxed.asInstanceOf[Array[Short]](index))
-    else if (elemClass eq classOf[Boolean])
-      Boolean.box(unboxed.asInstanceOf[Array[Boolean]](index))
-    else
-      unboxed.asInstanceOf[Array[AnyRef]](index)
-  }.asInstanceOf[A]
-
-  def update(index: Int, _elem: A): Unit = synchronized {
-    val elem = _elem.asInstanceOf[AnyRef]
-    if (unboxed eq null)
-      boxed(index) = elem
-    else if (elemClass eq classOf[Int])
-      unboxed.asInstanceOf[Array[Int]](index) = Int.unbox(elem)
-    else if (elemClass eq classOf[Double])
-      unboxed.asInstanceOf[Array[Double]](index) = Double.unbox(elem)
-    else if (elemClass eq classOf[Float])
-      unboxed.asInstanceOf[Array[Float]](index) = Float.unbox(elem)
-    else if (elemClass eq classOf[Long])
-      unboxed.asInstanceOf[Array[Long]](index) = Long.unbox(elem)
-    else if (elemClass eq classOf[Char])
-      unboxed.asInstanceOf[Array[Char]](index) = Char.unbox(elem)
-    else if (elemClass eq classOf[Byte])
-      unboxed.asInstanceOf[Array[Byte]](index) = Byte.unbox(elem)
-    else if (elemClass eq classOf[Short])
-      unboxed.asInstanceOf[Array[Short]](index) = Short.unbox(elem)
-    else if (elemClass eq classOf[Boolean])
-      unboxed.asInstanceOf[Array[Boolean]](index) = Boolean.unbox(elem)
-    else
-      unboxed.asInstanceOf[Array[AnyRef]](index) = elem
-  }
-
-  def unbox(elemClass: Class[_]): AnyRef = synchronized {
-    if (unboxed eq null) {
-      this.elemClass = elemClass;
-      if (elemClass eq classOf[Int]) {
-        val newvalue = new Array[Int](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Int.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue
-      } else if (elemClass eq classOf[Double]) {
-        val newvalue = new Array[Double](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Double.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass eq classOf[Float]) {
-        val newvalue = new Array[Float](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Float.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass eq classOf[Long]) {
-        val newvalue = new Array[Long](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Long.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass eq classOf[Char]) {
-        val newvalue = new Array[Char](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Char.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue
-      } else if (elemClass eq classOf[Byte]) {
-        val newvalue = new Array[Byte](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Byte.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass eq classOf[Short]) {
-        val newvalue = new Array[Short](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Short.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass eq classOf[Boolean]) {
-        val newvalue = new Array[Boolean](length)
-        var i = 0
-        while (i < length) {
-          newvalue(i) = Boolean.unbox(boxed(i))
-          i += 1
-        }
-        unboxed = newvalue;
-      } else if (elemClass == classOf[AnyRef]) {
-        unboxed = boxed
-      } else {
-        unboxed = Platform.createArray(elemClass, length)
-        if (elemClass.isArray) {
-          var i = 0
-          while (i < length) {
-            boxed(i) match {
-              case ba: BoxedArray[_] => boxed(i) = ba.unbox(elemClass.getComponentType())
-              case _ =>
-            }
-            i += 1
-          }
-        }
-        Platform.arraycopy(boxed, 0, unboxed, 0, length)
-      }
-      boxed = null
-    }
-    unboxed
-  }
-
-  override def equals(other: Any): Boolean =
-    other.isInstanceOf[BoxedAnyArray[_]] && (this eq (other.asInstanceOf[BoxedAnyArray[_]])) ||
-    (if (unboxed eq null) boxed == other else unboxed == other)
-
-  override def hashCode(): Int = hash
-
-  def value: AnyRef = {
-    if (unboxed eq null) throw new NotDefinedError("BoxedAnyArray.value")
-    unboxed
-  }
-
-  private def adapt(other: AnyRef): AnyRef =
-    if (this.unboxed eq null)
-      other match {
-        case that: BoxedAnyArray[_] =>
-          if (that.unboxed eq null) {
-            that.boxed
-          } else {
-            if (ScalaRunTime.isValueClass(that.elemClass)) unbox(that.elemClass);
-            that.unboxed
-          }
-        case that: BoxedArray[_] =>
-          adapt(that.value)
-        case that: Array[Int] =>
-          unbox(classOf[Int]); that
-        case that: Array[Double] =>
-          unbox(classOf[Double]); that
-        case that: Array[Float] =>
-          unbox(classOf[Float]); that
-        case that: Array[Long] =>
-          unbox(classOf[Long]); that
-        case that: Array[Char] =>
-          unbox(classOf[Char]); that
-        case that: Array[Short] =>
-          unbox(classOf[Short]); that
-        case that: Array[Byte] =>
-          unbox(classOf[Byte]); that
-        case that: Array[Boolean] =>
-          unbox(classOf[Boolean]); that
-        case _ =>
-          other
-      }
-    else
-      other match {
-        case that: BoxedAnyArray[_] =>
-          if (that.unboxed ne null) that.unboxed
-          else if (ScalaRunTime.isValueClass(this.elemClass)) that.unbox(this.elemClass)
-          else that.boxed
-        case that: BoxedArray[_] =>
-          adapt(that.value)
-        case _ =>
-          other
-      }
-
-  override def copyFrom(src: AnyRef, from: Int, to: Int, len: Int) {
-    val src1 = adapt(src)
-    Array.copy(src1, from, if (unboxed ne null) unboxed else boxed, to, len)
-  }
-
-  override def copyTo(from: Int, dest: AnyRef, to: Int, len: Int) {
-    var dest1 = adapt(dest)
-    Array.copy(if (unboxed ne null) unboxed else boxed, from, dest1, to, len)
-  }
-
-  final override def filter(p: A => Boolean): BoxedArray[A] = {
-    val (len, include) = countAndMemo(p)
-    val result = new BoxedAnyArray[A](len)
-    var i, j = 0
-    while (j < len) {
-      if (include(i)) { result(j) = this(i); j += 1 }
-      i += 1
-    }
-    result
-  }
-}
diff --git a/src/library/scalax/runtime/BoxedArray.scala b/src/library/scalax/runtime/BoxedArray.scala
deleted file mode 100755
index 47bb3a0d64..0000000000
--- a/src/library/scalax/runtime/BoxedArray.scala
+++ /dev/null
@@ -1,138 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-import Predef._
-import collection.mutable.{Vector, ArrayBuffer}
-import collection.generic._
-
-/**
- *  <p>A class representing <code>Array[T]</code></p>
- *
- *  @author  Martin Odersky, Stephane Micheloud
- *  @version 1.0
- */
-abstract class BoxedArray[A] extends Vector[A] with MutableVectorTemplate[BoxedArray, A] with Boxed {
-
-  /** The length of the array */
-  def length: Int
-
-  /** The element at given index */
-  def apply(index: Int): A
-
-  /** Update element at given index */
-  def update(index: Int, elem: A): Unit
-
-  /** Creates new builder for this collection ==> move to subclasses
-   *
-   * */
-  def newBuilder[B] = new ArrayBuffer[B].mapResult[BoxedArray] { // !!! Adriaan: can't drop [BoxedArray] here
-    _.toArray.asInstanceOf[BoxedArray[B]]
-  }
-
-  /** Convert to Java array.
-   *  @param elemTag    Either one of the tags ".N" where N is the name of a primitive type
-   *                    (@see ScalaRunTime), or a full class name.
-   */
-  def unbox(elemClass: Class[_]): AnyRef
-
-  /** The underlying array value
-   */
-  def value: AnyRef
-
-  def copyFrom(src: AnyRef, from: Int, to: Int, len: Int): Unit =
-    Array.copy(src, from, value, to, len)
-
-  def copyTo(from: Int, dest: AnyRef, to: Int, len: Int): Unit = {
-    Array.copy(value, from, dest, to, len)
-  }
-
-  override def equals(other: Any) =
-    (value == other) ||
-    other.isInstanceOf[BoxedArray[_]] && (value == other.asInstanceOf[BoxedArray[_]].value)
-
-  override def hashCode(): Int = value.hashCode()
-
-  /** Fills the given array <code>xs</code> with the elements of
-   *  this sequence starting at position <code>start</code>.
-   *
-   *  @param  xs the array to fill.
-   *  @param  start starting index.
-   *  @pre    the array must be large enough to hold all elements.
-   */
-  override def copyToArray[B](xs: Array[B], start: Int, len: Int): Unit =
-    copyTo(0, xs, start, len)
-
-  final def deepToString() = deepMkString(stringPrefix + "(", ", ", ")")
-
-  final def deepMkString(start: String, sep: String, end: String): String = {
-    def _deepToString(x: Any) = x match {
-      case a: AnyRef if ScalaRunTime.isArray(a) =>
-        ScalaRunTime.boxArray(a).deepMkString(start, sep, end)
-      case _ =>
-        ScalaRunTime.stringOf(x)
-    }
-    val buf = new StringBuilder()
-    buf.append(start)
-    val elems = elements
-    if (elems.hasNext) buf.append(_deepToString(elems.next))
-    while (elems.hasNext) {
-      buf.append(sep); buf.append(_deepToString(elems.next))
-    }
-    buf.append(end)
-    buf.toString
-  }
-
-  final def deepMkString(sep: String): String = this.deepMkString("", sep, "")
-
-  final def deepEquals(that: Any): Boolean = {
-    def _deepEquals(x1: Any, x2: Any) = (x1, x2) match {
-      case (a1: BoxedArray[_], a2: BoxedArray[_]) =>
-        _sameElements(a1, a2)
-      case (a1: AnyRef, a2: AnyRef)
-           if ScalaRunTime.isArray(a1) && ScalaRunTime.isArray(a2) =>
-        _sameElements(ScalaRunTime.boxArray(a1), ScalaRunTime.boxArray(a2))
-      case _ =>
-        x1.equals(x2)
-    }
-    def _sameElements(a1: BoxedArray[_], a2: BoxedArray[_]): Boolean = {
-      val it1 = a1.elements
-      val it2 = a2.elements
-      var res = true
-      while (res && it1.hasNext && it2.hasNext)
-        res = _deepEquals(it1.next, it2.next)
-      !it1.hasNext && !it2.hasNext && res
-    }
-    that match {
-      case a: BoxedArray[_] =>
-        _sameElements(this, a)
-      case a: AnyRef if ScalaRunTime.isArray(a) =>
-        _sameElements(this, ScalaRunTime.boxArray(a))
-      case _ =>
-        false
-    }
-  }
-
-  override final def stringPrefix: String = "Array"
-
-  protected def countAndMemo(p: A => Boolean): (Int, Array[Boolean]) = {
-    val len = length
-    val memo = new Array[Boolean](len)
-    var count = 0
-    var i = 0
-    while (i < len) {
-      if (p(this(i))) { memo(i) = true; count += 1 }
-      i += 1
-    }
-    (count, memo)
-  }
-}
diff --git a/src/library/scalax/runtime/BoxedBooleanArray.scala b/src/library/scalax/runtime/BoxedBooleanArray.scala
deleted file mode 100755
index 1dc136a50f..0000000000
--- a/src/library/scalax/runtime/BoxedBooleanArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedBooleanArray(val value: Array[Boolean]) extends BoxedArray[Boolean] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Boolean = value(index)
-
-  def update(index: Int, elem: Boolean) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedByteArray.scala b/src/library/scalax/runtime/BoxedByteArray.scala
deleted file mode 100755
index f42dbdda38..0000000000
--- a/src/library/scalax/runtime/BoxedByteArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedByteArray(val value: Array[Byte]) extends BoxedArray[Byte] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Byte = value(index)
-
-  def update(index: Int, elem: Byte) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedCharArray.scala b/src/library/scalax/runtime/BoxedCharArray.scala
deleted file mode 100755
index c6f19d26e0..0000000000
--- a/src/library/scalax/runtime/BoxedCharArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedCharArray(val value: Array[Char]) extends BoxedArray[Char] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Char = value(index)
-
-  def update(index: Int, elem: Char) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedDoubleArray.scala b/src/library/scalax/runtime/BoxedDoubleArray.scala
deleted file mode 100755
index 16fc3e1056..0000000000
--- a/src/library/scalax/runtime/BoxedDoubleArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedDoubleArray(val value: Array[Double]) extends BoxedArray[Double] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Double = value(index)
-
-  def update(index: Int, elem: Double) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedFloatArray.scala b/src/library/scalax/runtime/BoxedFloatArray.scala
deleted file mode 100755
index d10f16f6f6..0000000000
--- a/src/library/scalax/runtime/BoxedFloatArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedFloatArray(val value: Array[Float]) extends BoxedArray[Float] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Float = value(index)
-
-  def update(index: Int, elem: Float) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedIntArray.scala b/src/library/scalax/runtime/BoxedIntArray.scala
deleted file mode 100755
index 78a033190a..0000000000
--- a/src/library/scalax/runtime/BoxedIntArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedIntArray(val value: Array[Int]) extends BoxedArray[Int] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Int = value(index)
-
-  def update(index: Int, elem: Int) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedLongArray.scala b/src/library/scalax/runtime/BoxedLongArray.scala
deleted file mode 100755
index 86816d6638..0000000000
--- a/src/library/scalax/runtime/BoxedLongArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedLongArray(val value: Array[Long]) extends BoxedArray[Long] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Long = value(index)
-
-  def update(index: Int, elem: Long) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedShortArray.scala b/src/library/scalax/runtime/BoxedShortArray.scala
deleted file mode 100755
index 6d5c82e7ba..0000000000
--- a/src/library/scalax/runtime/BoxedShortArray.scala
+++ /dev/null
@@ -1,25 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: BoxedByteArray.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-@serializable
-final class BoxedShortArray(val value: Array[Short]) extends BoxedArray[Short] {
-
-  def length: Int = value.length
-
-  def apply(index: Int): Short = value(index)
-
-  def update(index: Int, elem: Short) {
-    value(index) = elem
-  }
-  def unbox(elemClass: Class[_]): AnyRef = value
-}
diff --git a/src/library/scalax/runtime/BoxedString.scala b/src/library/scalax/runtime/BoxedString.scala
deleted file mode 100644
index ef5a8b43c7..0000000000
--- a/src/library/scalax/runtime/BoxedString.scala
+++ /dev/null
@@ -1,195 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: RichString.scala 15602 2008-07-24 08:20:38Z washburn $
-
-
-package scalax.runtime
-
-import scala.util.matching.Regex
-import scalax.collection._
-import scalax.collection.mutable.StringBuilder
-import scalax.collection.generic
-import scalax.collection.generic._
-
-object BoxedString {
-  // just statics for rich string.
-  private final val LF: Char = 0x0A
-  private final val FF: Char = 0x0C
-  private final val CR: Char = 0x0D
-  private final val SU: Char = 0x1A
-}
-
-import BoxedString._
-
-class BoxedString(val self: String) extends StringVector[Char] with Proxy with PartialFunction[Int, Char] with Ordered[String] {
-
-  /** Return element at index `n`
-   *  @throws   IndexOutofBoundsException if the index is not valid
-   */
-  def apply(n: Int): Char = self charAt n
-
-  def length = self.length
-
-  override def unbox = self
-  override def mkString = self
-  override def toString = self
-
-  /** return n times the current string
-   */
-  def * (n: Int): String = {
-    val buf = new StringBuilder
-    for (i <- 0 until n) buf append self
-    buf.toString
-  }
-
-  override def compare(other: String) = self compareTo other
-
-  private def isLineBreak(c: Char) = c == LF || c == FF
-
-  /** <p>
-   *    Strip trailing line end character from this string if it has one.
-   *    A line end character is one of
-   *  </p>
-   *  <ul style="list-style-type: none;">
-   *    <li>LF - line feed   (0x0A hex)</li>
-   *    <li>FF - form feed   (0x0C hex)</li>
-   *  </ul>
-   *  <p>
-   *    If a line feed character LF is preceded by a carriage return CR
-   *    (0x0D hex), the CR character is also stripped (Windows convention).
-   *  </p>
-   */
-  def stripLineEnd: String = {
-    val len = self.length
-    if (len == 0) self
-    else {
-      val last = apply(len - 1)
-      if (isLineBreak(last))
-        self.substring(0, if (last == LF && len >= 2 && apply(len - 2) == CR) len - 2 else len - 1)
-      else
-        self
-    }
-  }
-
-  /** <p>
-   *    Return all lines in this string in an iterator, including trailing
-   *    line end characters.
-   *  </p>
-   *  <p>
-   *    The number of strings returned is one greater than the number of line
-   *    end characters in this string. For an empty string, a single empty
-   *    line is returned. A line end character is one of
-   *  </p>
-   *  <ul style="list-style-type: none;">
-   *    <li>LF - line feed   (0x0A hex)</li>
-   *    <li>FF - form feed   (0x0C hex)</li>
-   *  </ul>
-   */
-  def linesWithSeparators = new Iterator[String] {
-    val len = self.length
-    var index = 0
-    def hasNext: Boolean = index < len
-    def next(): String = {
-      if (index >= len) throw new NoSuchElementException("next on empty iterator")
-      val start = index
-      while (index < len && !isLineBreak(apply(index))) index += 1
-      index += 1
-      self.substring(start, index min len)
-    }
-  }
-
-  /** Return all lines in this string in an iterator, excluding trailing line
-   *  end characters, i.e. apply <code>.stripLineEnd</code> to all lines
-   *  returned by <code>linesWithSeparators</code>.
-   */
-  def lines: Iterator[String] =
-    linesWithSeparators map (line => new BoxedString(line).stripLineEnd)
-
-  /** Returns this string with first character converted to upper case */
-  def capitalize: String =
-    if (self == null) null
-    else if (self.length == 0) ""
-    else {
-      val chars = self.toCharArray
-      chars(0) = chars(0).toUpperCase
-      new String(chars)
-    }
-
-  /** <p>
-   *    For every line in this string:
-   *  </p>
-   *  <blockquote>
-   *     Strip a leading prefix consisting of blanks or control characters
-   *     followed by <code>marginChar</code> from the line.
-   *  </blockquote>
-   */
-  def stripMargin(marginChar: Char): String = {
-    val buf = new StringBuilder
-    for (line <- linesWithSeparators) {
-      val len = line.length
-      var index = 0
-      while (index < len && line.charAt(index) <= ' ') index += 1
-      buf append
-        (if (index < len && line.charAt(index) == marginChar) line.substring(index + 1) else line)
-    }
-    buf.toString
-  }
-
-  /** <p>
-   *    For every line in this string:
-   *  </p>
-   *  <blockquote>
-   *     Strip a leading prefix consisting of blanks or control characters
-   *     followed by <code>|</code> from the line.
-   *  </blockquote>
-   */
-  def stripMargin: String = stripMargin('|')
-
-  private def escape(ch: Char): String = "\\Q" + ch + "\\E"
-
-  @throws(classOf[java.util.regex.PatternSyntaxException])
-  def split(separator: Char): Array[String] = self.split(escape(separator))
-
-  @throws(classOf[java.util.regex.PatternSyntaxException])
-  def split(separators: Array[Char]): Array[String] = {
-    val re = separators.foldLeft("[")(_+escape(_)) + "]"
-    self.split(re)
-  }
-
-  /** You can follow a string with `.r', turning
-   *  it into a Regex. E.g.
-   *
-   *  """A\w*""".r   is the regular expression for identifiers starting with `A'.
-   */
-  def r: Regex = new Regex(self)
-
-  def toBoolean: Boolean = parseBoolean(self)
-  def toByte: Byte       = java.lang.Byte.parseByte(self)
-  def toShort: Short     = java.lang.Short.parseShort(self)
-  def toInt: Int         = java.lang.Integer.parseInt(self)
-  def toLong: Long       = java.lang.Long.parseLong(self)
-  def toFloat: Float     = java.lang.Float.parseFloat(self)
-  def toDouble: Double   = java.lang.Double.parseDouble(self)
-
-  private def parseBoolean(s: String): Boolean =
-    if (s != null) s.toLowerCase match {
-      case "true" => true
-      case "false" => false
-      case _ => throw new NumberFormatException("For input string: \""+s+"\"")
-    }
-    else
-      throw new NumberFormatException("For input string: \"null\"")
-
-  def toArray: Array[Char] = {
-    val result = new Array[Char](length)
-    self.getChars(0, length, result, 0)
-    result
-  }
-}
-
diff --git a/src/library/scalax/runtime/ScalaRunTime.scala b/src/library/scalax/runtime/ScalaRunTime.scala
deleted file mode 100755
index 0c8416be89..0000000000
--- a/src/library/scalax/runtime/ScalaRunTime.scala
+++ /dev/null
@@ -1,152 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2002-2009, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: ScalaRunTime.scala 17000 2009-01-29 13:05:53Z odersky $
-
-
-package scalax.runtime
-
-/* The object <code>ScalaRunTime</code> provides ...
- */
-object ScalaRunTime {
-
-  def isArray(x: AnyRef): Boolean = (x != null && x.getClass.isArray) || (x != null && x.isInstanceOf[BoxedArray[_]])
-  def isValueClass(clazz: Class[_]) = clazz.isPrimitive()
-
-  def forceBoxedArray[A <: Any](xs: Seq[A]): Array[A] = {
-    val array = new Array[A](xs.length)
-    var i = 0
-    for (x <- xs.elements) { array(i) = x; i += 1 }
-    array
-  }
-
-  def checkInitialized[T <: AnyRef](x: T): T =
-    if (x == null) throw new UninitializedError else x
-
-  abstract class Try[a] {
-    def Catch[b >: a](handler: PartialFunction[Throwable, b]): b
-    def Finally(handler: Unit): a
-  }
-
-  def Try[a](block: => a): Try[a] = new Try[a] with Runnable {
-    var result: a = _
-    var exception: Throwable = scala.runtime.ExceptionHandling.tryCatch(this)
-
-    def run(): Unit = result = block
-
-    def Catch[b >: a](handler: PartialFunction[Throwable, b]): b =
-      if (exception eq null)
-        result.asInstanceOf[b]
-      // !!! else if (exception is LocalReturn)
-      // !!!   // ...
-      else if (handler isDefinedAt exception)
-        handler(exception)
-      else
-        throw exception
-
-    def Finally(handler: Unit): a =
-      if (exception eq null)
-        result.asInstanceOf[a]
-      else
-        throw exception
-  }
-
-  def caseFields(x: Product): List[Any] = {
-    val arity = x.productArity
-    def fields(from: Int): List[Any] =
-      if (from == arity) List()
-      else x.productElement(from) :: fields(from + 1)
-    fields(0)
-  }
-
-  def _toString(x: Product): String =
-    caseFields(x).mkString(x.productPrefix + "(", ",", ")")
-
-  def _hashCode(x: Product): Int = {
-    var code = x.getClass().hashCode()
-    val arr =  x.productArity
-    var i = 0
-    while (i < arr) {
-      val elem = x.productElement(i)
-      code = code * 41 + (if (elem == null) 0 else elem.hashCode())
-      i += 1
-    }
-    code
-  }
-
-  def _equals(x: Product, y: Any): Boolean = y match {
-    case y1: Product if x.productArity == y1.productArity =>
-      val arity = x.productArity
-      var i = 0
-      while (i < arity && x.productElement(i) == y1.productElement(i))
-        i += 1
-      i == arity
-    case _ =>
-      false
-  }
-
-  def _equalsWithVarArgs(x: Product, y: Any): Boolean = y match {
-    case y1: Product if x.productArity == y1.productArity =>
-      val arity = x.productArity
-      var i = 0
-      while (i < arity - 1 && x.productElement(i) == y1.productElement(i))
-        i += 1
-      i == arity - 1 && {
-        x.productElement(i) match {
-          case xs: Seq[_] =>
-            y1.productElement(i) match {
-              case ys: Seq[_] => xs sameElements ys
-            }
-        }
-      }
-    case _ =>
-      false
-  }
-
-  //def checkDefined[T >: Null](x: T): T =
-  //  if (x == null) throw new UndefinedException else x
-
-  def Seq[a](xs: a*): Seq[a] = null // interpreted specially by new backend.
-
-  def arrayValue[A](x: BoxedArray[A], elemClass: Class[_]): AnyRef =
-    if (x eq null) null else x.unbox(elemClass)
-
-  def boxArray(value: AnyRef): BoxedArray[_] = value match {
-    case x: Array[Byte] => new BoxedByteArray(x)
-/*
-    case x: Array[Short] => new BoxedShortArray(x)
-    case x: Array[Char] => new BoxedCharArray(x)
-    case x: Array[Int] => new BoxedIntArray(x)
-    case x: Array[Long] => new BoxedLongArray(x)
-    case x: Array[Float] => new BoxedFloatArray(x)
-    case x: Array[Double] => new BoxedDoubleArray(x)
-    case x: Array[Boolean] => new BoxedBooleanArray(x)
-    case x: Array[AnyRef] => new BoxedObjectArray(x)
-*/
-    case x: BoxedArray[_] => x
-  }
-
-  /** Given any Scala value, convert it to a String.
-   *
-   * The primary motivation for this method is to provide a means for
-   * correctly obtaining a String representation of a value, while
-   * avoiding the pitfalls of naïvely calling toString on said value.
-   * In particular, it addresses the fact that (a) toString cannot be
-   * called on null and (b) depending on the apparent type of an
-   * array, toString may or may not print it in a human-readable form.
-   *
-   * @param arg the value to stringify
-   * @return a string representation of <code>arg</code>
-   *
-   */
-  def stringOf(arg : Any): String = arg match {
-    case null => "null"
-    case (arg : AnyRef) if isArray(arg) => boxArray(arg).deepToString
-    case arg => arg.toString
-  }
-}
diff --git a/src/library/scalax/runtime/StringVector.scala b/src/library/scalax/runtime/StringVector.scala
deleted file mode 100644
index a612b7d7a5..0000000000
--- a/src/library/scalax/runtime/StringVector.scala
+++ /dev/null
@@ -1,54 +0,0 @@
-/*                     __                                               *\
-**     ________ ___   / /  ___     Scala API                            **
-**    / __/ __// _ | / /  / _ |    (c) 2003-2007, LAMP/EPFL             **
-**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
-** /____/\___/_/ |_/____/_/ | |                                         **
-**                          |/                                          **
-\*                                                                      */
-
-// $Id: Buffer.scala 15799 2008-08-15 18:23:54Z odersky $
-
-
-package scalax.runtime
-
-import collection.immutable.Vector
-import collection.mutable.ArrayBuffer
-import collection.generic.VectorTemplate
-import annotation.unchecked.uncheckedVariance
-
-object StringVector {
-
-  implicit def unbox(sv: StringVector[Char]): String = sv.mkString
-
-}
-
-@cloneable
-abstract class StringVector[+A] extends VectorTemplate[StringVector, A @uncheckedVariance] with Vector[A] {
-
-  /** The length of the string */
-  def length: Int
-
-  /** The element at given index */
-  def apply(idx: Int): A
-
-  /** Creates new builder for this collection */
-  def newBuilder[B] = new ArrayBuffer[B].mapResult[StringVector] { // !!! Adriaan: can't drop [StringVector] here
-    buf => new StringVector[B] {
-      def length = buf.length
-      def apply(n: Int) = buf.apply(n)
-      override def foreach(f: B => Unit) = buf.foreach(f)
-    }
-  }
-
-  def unbox: String = {
-    val sb = new StringBuilder
-    for (x <- this)
-      sb append x.asInstanceOf[Char]
-    sb.toString
-  }
-
-  override def toString = mkString
-
-}
-
-