TraversableOnce. Review by odersky.

1 files changed, 4 insertions, 12 deletions

diff --git a/src/library/scala/collection/mutable/SynchronizedSet.scala b/src/library/scala/collection/mutable/SynchronizedSet.scala
index 0f129ad2cc..d3023b9136 100644
--- a/src/library/scala/collection/mutable/SynchronizedSet.scala
+++ b/src/library/scala/collection/mutable/SynchronizedSet.scala
@@ -39,24 +39,16 @@ trait SynchronizedSet[A] extends Set[A] {
     super.+=(elem)
   }
 
-  override def ++=(that: Traversable[A]): this.type = synchronized[this.type] {
-    super.++=(that)
-  }
-
-  override def ++=(it: Iterator[A]): this.type = synchronized[this.type] {
-    super.++=(it)
+  override def ++=(xs: TraversableOnce[A]): this.type = synchronized[this.type] {
+    super.++=(xs)
   }
 
   abstract override def -=(elem: A): this.type = synchronized[this.type] {
     super.-=(elem)
   }
 
-  override def --=(that: Traversable[A]): this.type = synchronized[this.type] {
-    super.--=(that)
-  }
-
-  override def --=(it: Iterator[A]): this.type = synchronized[this.type] {
-    super.--=(it)
+  override def --=(xs: TraversableOnce[A]): this.type = synchronized[this.type] {
+    super.--=(xs)
   }
 
   override def update(elem: A, included: Boolean): Unit = synchronized {