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diff --git a/Source/JavaScriptCore/runtime/JSLexicalEnvironment.h b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.h
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+/*
+ * Copyright (C) 2008, 2009, 2013-2015 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "CodeBlock.h"
+#include "JSEnvironmentRecord.h"
+#include "SymbolTable.h"
+
+namespace JSC {
+
+class JSLexicalEnvironment : public JSEnvironmentRecord {
+protected:
+    JSLexicalEnvironment(VM&, Structure*, JSScope*, SymbolTable*);
+    
+public:
+    typedef JSEnvironmentRecord Base;
+    static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetPropertyNames | OverridesToThis;
+
+    static JSLexicalEnvironment* create(
+        VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable, JSValue initialValue)
+    {
+        JSLexicalEnvironment* result = 
+            new (
+                NotNull,
+                allocateCell<JSLexicalEnvironment>(vm.heap, allocationSize(symbolTable)))
+            JSLexicalEnvironment(vm, structure, currentScope, symbolTable);
+        result->finishCreation(vm, initialValue);
+        return result;
+    }
+
+    static JSLexicalEnvironment* create(VM& vm, JSGlobalObject* globalObject, JSScope* currentScope, SymbolTable* symbolTable, JSValue initialValue)
+    {
+        Structure* structure = globalObject->activationStructure();
+        return create(vm, structure, currentScope, symbolTable, initialValue);
+    }
+        
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
+
+    static bool put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+
+    static bool deleteProperty(JSCell*, ExecState*, PropertyName);
+
+    static JSValue toThis(JSCell*, ExecState*, ECMAMode);
+
+    DECLARE_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject) { return Structure::create(vm, globalObject, jsNull(), TypeInfo(LexicalEnvironmentType, StructureFlags), info()); }
+};
+
+inline JSLexicalEnvironment::JSLexicalEnvironment(VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable)
+    : Base(vm, structure, currentScope, symbolTable)
+{
+}
+
+inline JSLexicalEnvironment* asActivation(JSValue value)
+{
+    ASSERT(asObject(value)->inherits(*value.getObject()->vm(), JSLexicalEnvironment::info()));
+    return jsCast<JSLexicalEnvironment*>(asObject(value));
+}
+    
+} // namespace JSC