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diff --git a/Source/JavaScriptCore/runtime/WeakSetConstructor.h b/Source/JavaScriptCore/runtime/WeakSetConstructor.h
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+++ b/Source/JavaScriptCore/runtime/WeakSetConstructor.h
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+/*
+ * Copyright (C) 2015 Apple, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#pragma once
+
+#include "InternalFunction.h"
+
+namespace JSC {
+
+class WeakSetPrototype;
+class GetterSetter;
+
+class WeakSetConstructor : public InternalFunction {
+public:
+    typedef InternalFunction Base;
+
+    static WeakSetConstructor* create(VM& vm, Structure* structure, WeakSetPrototype* prototype, GetterSetter*)
+    {
+        WeakSetConstructor* constructor = new (NotNull, allocateCell<WeakSetConstructor>(vm.heap)) WeakSetConstructor(vm, structure);
+        constructor->finishCreation(vm, prototype);
+        return constructor;
+    }
+
+    DECLARE_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+    }
+
+private:
+    WeakSetConstructor(VM& vm, Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+    void finishCreation(VM&, WeakSetPrototype*);
+    static ConstructType getConstructData(JSCell*, ConstructData&);
+    static CallType getCallData(JSCell*, CallData&);
+};
+
+} // namespace JSC