Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-488.cs

@@ -0,0 +1,24 @@
+class Ref {}
+
+class Def : Ref {}
+
+interface IFooRef {
+    Ref Bar { get; }
+}
+
+interface IFooDef : IFooRef {
+    new Def Bar { get; set; }
+}
+
+class FooProcessor<T> where T : IFooDef {
+    public void Attach (T t, Def def)
+    {
+        t.Bar = def;
+    }
+}
+
+class Program {
+    public static void Main ()
+    {
+    }
+}