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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback TestUnionArguments = undefined((DOMString or long) arg1,
+ (DOMString or long)? arg2,
+ optional (DOMString or long) arg3,
+ optional (DOMString or long)? arg4);