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/Traversable.scala b/src/library/scala/collection/mutable/Traversable.scala
index b711e0b4db..04b67c0bad 100644
--- a/src/library/scala/collection/mutable/Traversable.scala
+++ b/src/library/scala/collection/mutable/Traversable.scala
@@ -32,7 +32,7 @@ trait Traversable[A] extends scala.collection.Traversable[A]
  *  @define Coll mutable.Traversable
  */
 object Traversable extends TraversableFactory[Traversable] {
-  implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Traversable[A]] = new GenericCanBuildFrom[A]
+  implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Traversable[A]] = ReusableCBF.asInstanceOf[GenericCanBuildFrom[A]]
   def newBuilder[A]: Builder[A, Traversable[A]] = new ArrayBuffer
 }