Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-500.cs

@@ -0,0 +1,27 @@
+using System;
+
+interface I
+{
+}
+
+struct S : I
+{
+}
+
+class Program
+{
+	public static int Main ()
+	{
+		int? a = 5;
+		int? b = 5;
+		IComparable ic_a = a;
+		IComparable ic_b = b;
+		if (ic_a.CompareTo (ic_b) != 0)
+			return 1;
+
+		S? s = new S ();
+		I iface = s;
+
+		return 0;
+	}
+}