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diff --git a/src/library/scala/collection/mutable/GenericArray.scala b/src/library/scala/collection/mutable/GenericArray.scala
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+++ b/src/library/scala/collection/mutable/GenericArray.scala
@@ -0,0 +1,77 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ResizableArray.scala 18387 2009-07-24 15:28:37Z odersky $
+
+
+package scala.collection.mutable
+
+import scala.collection.generic._
+
+/** This class is used internally to implement data structures that
+ *  are based on resizable arrays.
+ *
+ *  @author  Matthias Zenger, Burak Emir
+ *  @author Martin Odersky
+ *  @version 2.8
+ */
+class GenericArray[A](override val length: Int)
+extends Vector[A]
+   with TraversableClass[A, GenericArray]
+   with VectorTemplate[A, GenericArray[A]] {
+
+  override def companion: Companion[GenericArray] = GenericArray
+
+  var array: Array[AnyRef] = new Array[AnyRef](length)
+
+  def apply(idx: Int): A = {
+    if (idx >= length) throw new IndexOutOfBoundsException(idx.toString)
+    array(idx).asInstanceOf[A]
+  }
+
+  def update(idx: Int, elem: A) {
+    if (idx >= length) 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, length)
+  }
+
+  /** Copy all elements to a buffer
+   *  @param   The buffer to which elements are copied
+  override def copyToBuffer[B >: A](dest: Buffer[B]) {
+    dest ++= (array: Sequence[AnyRef]).asInstanceOf[Sequence[B]]
+  }
+   */
+
+  override def foreach[U](f: A =>  U) {
+    var i = 0
+    while (i < length) {
+      f(array(i).asInstanceOf[A])
+      i += 1
+    }
+  }
+}
+
+object GenericArray extends SequenceFactory[GenericArray] {
+  implicit def builderFactory[A]: BuilderFactory[A, GenericArray[A], Coll] = new VirtualBuilderFactory[A]
+  def newBuilder[A]: Builder[A, GenericArray[A]] =
+    new ArrayBuffer[A] mapResult { buf =>
+      val result = new GenericArray[A](buf.length)
+      for (i <- 0 until buf.length) result.array(i) = buf(i).asInstanceOf[AnyRef]
+      // !!! todo: replace with    buf.copyToArray(result.array, 0)
+      result
+    }
+}