Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

mcs/tests/test-null-operator-13.cs

@@ -0,0 +1,41 @@
+using System;
+
+static class Crash
+{
+	static X GetFoo ()
+	{
+		return null;
+	}
+
+	static int Main ()
+	{
+		int res = (GetFoo ()?.ToLower ()).ToUpper ();
+		if (res != 0)
+			return 1;
+
+		return 0;
+	}
+}
+
+class X
+{
+	public Y ToLower ()
+	{
+		throw new ApplicationException ("should not be called");
+	}
+}
+
+class Y
+{
+}
+
+static class SS
+{
+	public static int ToUpper (this Y y)
+	{
+		if (y != null)
+			return 1;
+
+		return 0;
+	}
+}