Fixed cloning a double-linked list.

Still need to determine if this is a systemic
issue and needs to be addressed higher in the
linked list hierarchy.   For now, just
fixing the reported bug, with a note here
for other maintainers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/library/scala/collection/mutable/DoubleLinkedList.scala b/src/library/scala/collection/mutable/DoubleLinkedList.scala
index cba4e9725e..b7c5f07502 100644
--- a/src/library/scala/collection/mutable/DoubleLinkedList.scala
+++ b/src/library/scala/collection/mutable/DoubleLinkedList.scala
@@ -63,6 +63,13 @@ class DoubleLinkedList[A]() extends AbstractSeq[A]
   }
 
   override def companion: GenericCompanion[DoubleLinkedList] = DoubleLinkedList
+
+  // Accurately clone this collection.  See SI-6296
+  override def clone(): DoubleLinkedList[A] = {
+    val builder = newBuilder
+    builder ++= this
+    builder.result
+  }
 }
 
 /** $factoryInfo