Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-483.cs

@@ -0,0 +1,20 @@
+// Compiler options: -r:test-483-lib.dll
+
+using System;
+
+public class Tests
+{
+	public static void Main ()
+	{
+		Bar bar = null;
+		try { bar.clone (); } catch (NullReferenceException) {}
+	}
+}
+
+class B : Bar
+{
+	public override object clone ()
+	{
+		return null;
+	}
+}