Fix SI-4813 - Clone doesn't work on LinkedList.

* Added extensive test for clone across all standard mutable collections
* Fixed clone implementations when needed so they work.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/library/scala/collection/mutable/MutableList.scala b/src/library/scala/collection/mutable/MutableList.scala
index c9e44ac165..6fa1f4872a 100644
--- a/src/library/scala/collection/mutable/MutableList.scala
+++ b/src/library/scala/collection/mutable/MutableList.scala
@@ -140,6 +140,13 @@ extends AbstractSeq[A]
   }
 
   def result = this
+
+  override def clone(): MutableList[A]  = {
+    val bf = newBuilder
+    bf ++= seq
+    bf.result
+  }
+
 }