Fix for wrong results from groupBy on views.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/files/run/bug4660.scala b/test/files/run/bug4660.scala
new file mode 100644
index 0000000000..e57bb4bf25
--- /dev/null
+++ b/test/files/run/bug4660.scala
@@ -0,0 +1,11 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+    val traversable = 1 to 20 map (_.toString)
+    def normalize(m: Map[Char, Traversable[String]]) = m.map { case (k,v) => (k, v.toList) }
+
+    val groupedFromView   = (traversable view).groupBy(_(0))
+    val groupedFromStrict = traversable.groupBy(_(0))
+
+    assert(normalize(groupedFromView) == normalize(groupedFromStrict))
+  }
+}