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diff --git a/js/public/experimental/Intl.h b/js/public/experimental/Intl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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/. */
+
+#ifndef js_experimental_Intl_h
+#define js_experimental_Intl_h
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "js/TypeDecls.h"
+
+namespace JS {
+
+/**
+ * Create and add the Intl.MozDateTimeFormat constructor function to the
+ * provided object.
+ *
+ * This custom date/time formatter constructor gives users the ability to
+ * specify a custom format pattern. This pattern is passed *directly* to ICU
+ * with NO SYNTAX PARSING OR VALIDATION WHATSOEVER.  ICU appears to have a
+ * modicum of testing of this, and it won't fall over completely if passed bad
+ * input.  But the current behavior is entirely under-specified and emphatically
+ * not shippable on the web, and it *must* be fixed before this functionality
+ * can be exposed in the real world.  (There are also some questions about
+ * whether the format exposed here is the *right* one to standardize, that will
+ * also need to be resolved to ship this.)
+ *
+ * If JS was built without JS_HAS_INTL_API, this function will throw an
+ * exception.
+ */
+extern JS_PUBLIC_API bool AddMozDateTimeFormatConstructor(
+    JSContext* cx, Handle<JSObject*> intl);
+
+/**
+ * Create and add the Intl.MozDisplayNames constructor function to the
+ * provided object.  This constructor acts like the standard |Intl.DisplayNames|
+ * but accepts certain additional syntax that isn't standardized to the point of
+ * being shippable.
+ *
+ * If JS was built without JS_HAS_INTL_API, this function will throw an
+ * exception.
+ */
+extern JS_PUBLIC_API bool AddMozDisplayNamesConstructor(JSContext* cx,
+                                                        Handle<JSObject*> intl);
+
+}  // namespace JS
+
+#endif  // js_experimental_Intl_h