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diff --git a/src/library/scalax/collection/generic/mutable/Growable.scala b/src/library/scalax/collection/generic/mutable/Growable.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     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.mutable
+
+/** This class represents collections that can be augmented using a += operator.
+ *
+ *  @autor   Martin Odersky
+ *  @owner   Martin Odersky
+ *  @version 2.8
+ */
+trait Growable[A] {
+
+  /** Add a single element to this collection.
+   *
+   *  @param elem  the element to add.
+   */
+  def +=(elem: A): Unit
+
+  /** Add a two or more elements to this collection.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  def +=(elem1: A, elem2: A, elems: A*) {
+    this += elem1
+    this += elem2
+    this ++= elems.asInstanceOf[Iterable[A]] // !@!
+  }
+
+  /** Adds a number of elements provided by an iterator
+   *
+   *  @param iter  the iterator.
+   */
+  def ++=(iter: collection.Iterator[A]) { iter foreach += }
+
+  /** Adds a number of elements provided by an iterable object
+   *  via its <code>elements</code> method.
+   *
+   *  @param iter  the iterable object.
+   */
+  def ++=(iter: collection.Iterable[A]) { iter foreach += }
+
+  /** Add a single element to this collection and return
+   *  the identity of the collection.
+   *
+   *  @param elem  the element to add.
+   */
+  def +(elem: A): this.type = { this += elem; this }
+
+  /** Add two or more elements to this collection and return
+   *  the identity of the collection.
+   *
+   *  @param elem1 the first element to add.
+   *  @param elem2 the second element to add.
+   *  @param elems the remaining elements to add.
+   */
+  def +(elem1: A, elem2: A, elems: A*): this.type =
+    this + elem1 + elem2 ++ elems.asInstanceOf[Iterable[A]] // !@!
+
+  /** Adds a number of elements provided by an iterable object
+   *  via its <code>elements</code> method. The identity of the
+   *  collection is returned.
+   *
+   *  @param iter     the iterable object.
+   *  @return       the updated collection.
+   */
+  def ++(iter: Iterable[A]): this.type = { this ++= iter; this }
+
+  /** Adds a number of elements provided by an iterator
+   *  via its <code>elements</code> method. The identity of the
+   *  collection is returned.
+   *
+   *  @param iter   the iterator
+   *  @return       the updated collection.
+   */
+  def ++(iter: Iterator[A]): this.type = { this ++= iter; this }
+
+  /** Clears the collection contents.
+   */
+  def clear()
+}
+
+
+
+