Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-75.cs

@@ -0,0 +1,36 @@
+//
+// This test probes using an operator overloaded in a parents' parent
+//
+
+class X {
+	public static bool called = false;
+	
+	static public X operator + (X a, X b)
+	{
+		called = true;
+		return null;
+	}
+}
+
+class Y : X {
+}
+
+class Z : Y {
+}
+
+class driver {
+
+	public static int Main ()
+	{
+		Z a = new Z ();
+		Z b = new Z ();
+		X c = a + b;
+
+		if (X.called)
+			return 0;
+
+		return 1;
+	}
+
+}
+