Discovered another impressive source of unneces...

Discovered another impressive source of unnecessary garbage is every
collection creating a new GenericCanBuildFrom for every map ever
performed. They can all use the same one: they all have the same
implementation. It looks like tiark had already figured this out and
done it for Vector: I followed with the other fifty. I really haven't
the least idea who to have review most things. No review.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/collection/mutable/ArrayStack.scala b/src/library/scala/collection/mutable/ArrayStack.scala
index ce4fe30630..d31627f55a 100644
--- a/src/library/scala/collection/mutable/ArrayStack.scala
+++ b/src/library/scala/collection/mutable/ArrayStack.scala
@@ -22,7 +22,7 @@ import generic._
  *  @define Coll ArrayStack
  */
 object ArrayStack extends SeqFactory[ArrayStack] {
-  implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, ArrayStack[A]] = new GenericCanBuildFrom[A]
+  implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, ArrayStack[A]] = ReusableCBF.asInstanceOf[GenericCanBuildFrom[A]]
   def newBuilder[A]: Builder[A, ArrayStack[A]] = new ArrayStack[A]
   def empty: ArrayStack[Nothing] = new ArrayStack()
   def apply[A: ClassManifest](elems: A*): ArrayStack[A] = {