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diff --git a/dom/webidl/TestInterfaceJSDictionaries.webidl b/dom/webidl/TestInterfaceJSDictionaries.webidl
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+++ b/dom/webidl/TestInterfaceJSDictionaries.webidl
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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/.
+ */
+
+//
+// These dictionaries are in a separate WebIDL file to avoid circular include
+// problems. One of the dictionary includes a union as a member, so that
+// dictionary's header needs to include UnionTypes.h. But the API in
+// TestInterfaceJS also declares a union of dictionaries, so _that_
+// dictionary's header needs to be included _by_ UnionTypes.h. The solution
+// is to separate those two dictionaries into separate header files.
+//
+
+dictionary TestInterfaceJSDictionary2 {
+  object innerObject;
+};
+
+dictionary TestInterfaceJSDictionary {
+  TestInterfaceJSDictionary2 innerDictionary;
+  object objectMember;
+  any anyMember;
+  (object or DOMString) objectOrStringMember;
+  sequence<any> anySequenceMember;
+  record<DOMString, object> objectRecordMember;
+};