Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-549.cs

@@ -0,0 +1,36 @@
+class C<T>
+{
+	public interface IA
+	{
+		void MA (T arg);
+	}
+	
+	public interface IB : IA
+	{
+		void MB (T arg);
+	}
+}
+
+class D : C<int>
+{
+	public class Impl : IB
+	{
+		public void MA (int arg)
+		{
+		}
+		
+		public void MB (int arg)
+		{
+		}
+	}
+}
+
+class Test
+{
+	public static void Main ()
+	{
+		C<int>.IB arg = new D.Impl ();
+		arg.MA (1);
+		arg.MB (1);	
+	}
+}