1 files changed, 3 insertions, 2 deletions
diff --git a/src/library/scala/collection/immutable/HashSet.scala b/src/library/scala/collection/immutable/HashSet.scala
index 87995f705f..0546c54826 100644
--- a/src/library/scala/collection/immutable/HashSet.scala
+++ b/src/library/scala/collection/immutable/HashSet.scala
@@ -30,6 +30,7 @@ import scala.collection.parallel.immutable.ParHashSet
  *  @define coll immutable hash set
  */
 @SerialVersionUID(2L)
+@deprecatedInheritance("The implementation details of immutable hash sets make inheriting from them unwise.", "2.11.0")
 class HashSet[A] extends AbstractSet[A]
                     with Set[A]
                     with GenericSetTemplate[A, HashSet]
@@ -301,8 +302,8 @@ time { mNew.iterator.foreach( p => ()) }
 
 */
     override def foreach[U](f: A =>  U): Unit = {
-      var i = 0;
-      while (i < elems.length) {
+      var i = 0
+  while (i < elems.length) {
         elems(i).foreach(f)
         i += 1
       }