Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-255.cs

@@ -0,0 +1,20 @@
+using System;
+
+public abstract class A
+{
+        public abstract T Foo<T> ();
+}
+
+public abstract class B : A
+{
+        public override T Foo<T> ()
+        {
+                return default (T);
+        }
+}
+
+public class C : B
+{
+	public static void Main ()
+	{ }
+}