Overrides immutable.{ Map, Set, Seq } to return...

Overrides immutable.{ Map, Set, Seq } to return self on
the corresponding toMap/toSet/toSeq.  Closes #3953, review
by prokopec.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/files/run/collections-toSelf.scala b/test/files/run/collections-toSelf.scala
new file mode 100644
index 0000000000..02f1dd6a95
--- /dev/null
+++ b/test/files/run/collections-toSelf.scala
@@ -0,0 +1,11 @@
+object Test {
+  val map = Map(1 -> 2)
+  val set = Set(1, 2)
+  val seq = collection.immutable.Seq(1, 2)
+
+  def main(args: Array[String]): Unit = {
+    assert(map.toMap eq map)
+    assert(set.toSet eq set)
+    assert(seq.toSeq eq seq)
+  }
+}