1 files changed, 15 insertions, 0 deletions
diff --git a/test/files/pos/collections.scala b/test/files/pos/collections.scala
new file mode 100644
index 0000000000..9206a6e500
--- /dev/null
+++ b/test/files/pos/collections.scala
@@ -0,0 +1,15 @@
+package mixins;
+
+import scala.collection.mutable._;
+
+class Collections extends HashSet[Int] with ObservableSet[Int,Collections] {
+  override def +=(elem: Int): Unit = super.+=(elem);
+  override def -=(elem: Int): Unit = super.-=(elem);
+  override def clear: Unit = super.clear;
+
+}
+
+object collections extends Collections;
+
+class Collections1 extends HashSet[Int] with ObservableSet[Int,Collections1];
+object collections1 extends Collections1;