Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

mcs/tests/test-null-operator-21.cs

@@ -0,0 +1,17 @@
+class X
+{
+	public object MyChildObject;
+}
+
+interface ISomeInterface
+{
+}
+
+class MainClass
+{
+	public static void Main ()
+	{
+		X myObject = null;
+		var x = (myObject?.MyChildObject is ISomeInterface);
+	}
+}