Fixes #1477 by requiring that abstract types wi...

Fixes #1477 by requiring that abstract types with non-volatile upper
bounds cannot be overridden by volatile types.

1 files changed, 25 insertions, 0 deletions

diff --git a/test/files/neg/t1477.scala b/test/files/neg/t1477.scala
new file mode 100644
index 0000000000..0cc0cd5f7a
--- /dev/null
+++ b/test/files/neg/t1477.scala
@@ -0,0 +1,25 @@
+object Test extends Application {
+ trait A
+ trait B extends A
+
+  trait C {
+    type U
+    trait D { type T >: B <: A }
+    type V <: D
+    val y: V#T = new B { }
+  }
+
+  trait Middle extends C {
+    type V <: (D with U)
+  }
+
+  class D extends Middle {
+    trait E
+    trait F { type T = E }
+    type U = F
+    def frob(arg : E) : E = arg
+    frob(y)
+  }
+
+  new D
+}