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-rw-r--r--src/library/scala/collection/mutable/ImmutableSetAdaptor.scala1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala b/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
index dc6d319b45..730b22227d 100644
--- a/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
+++ b/src/library/scala/collection/mutable/ImmutableSetAdaptor.scala
@@ -20,6 +20,7 @@ package mutable
* @version 1.0, 21/07/2003
* @since 1
*/
+@deprecated("Adaptors are inherently unreliable and prone to performance problems.", "2.11.0")
class ImmutableSetAdaptor[A](protected var set: immutable.Set[A])
extends AbstractSet[A]
with Set[A]