Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-263.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+
+class Foo<S>
+{
+	public ICloneable Test (S t)
+	{
+		return (ICloneable) t;
+	}
+}
+
+public static class ConvertHelper
+{
+	public static IEnumerator<T> Test<S,T> (S s)
+		where T : S
+	{
+		yield return (T) s;
+	}
+
+	public static void Main ()
+	{ }
+}