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diff --git a/deps/v8/test/webkit/class-syntax-prototype.js b/deps/v8/test/webkit/class-syntax-prototype.js
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+// Copyright 2015 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 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. 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 INC. 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.
+
+// Flags: --harmony-sloppy
+
+description('Tests for the descriptors of the properties implicitly defined by ES6 class syntax');
+
+function descriptor(object, propertyName) {
+    return Object.getOwnPropertyDescriptor(object, propertyName);
+}
+
+function enumeratedProperties(object) {
+    var properties = [];
+    for (var propertyName in object)
+        properties.push(propertyName);
+    return properties;
+}
+
+Array.prototype.includes = function(element) {
+  return this.indexOf(element) !== -1;
+};
+
+shouldBeFalse('class A {}; descriptor(A, "prototype").writable');
+shouldBe('class A {}; var x = A.prototype; A.prototype = 3; A.prototype', 'x');
+shouldBeFalse('class A {}; descriptor(A, "prototype").enumerable');
+shouldBeTrue('class A {}; A.foo = "foo"; enumeratedProperties(A).includes("foo")');
+shouldBeFalse('class A {}; enumeratedProperties(A).includes("prototype")');
+shouldBeFalse('class A {}; descriptor(A, "prototype").configurable');
+shouldThrow('class A {}; Object.defineProperty(A, "prototype", {value: "foo"})', '"TypeError: Cannot redefine property: prototype"');
+
+shouldBeTrue('class A { static foo() {} }; descriptor(A, "foo").writable');
+shouldBe('class A { static foo() {} }; A.foo = 3; A.foo', '3');
+shouldBeFalse('class A { static foo() {} }; descriptor(A, "foo").enumerable');
+shouldBeFalse('class A { static foo() {} }; enumeratedProperties(A).includes("foo")');
+shouldBeTrue('class A { static foo() {} }; descriptor(A, "foo").configurable');
+shouldBe('class A { static foo() {} }; Object.defineProperty(A, "foo", {value: "bar"}); A.foo', '"bar"');
+
+shouldBe('class A { static get foo() {} }; descriptor(A, "foo").writable', 'undefined');
+shouldBe('class A { static get foo() { return 5; } }; A.foo = 3; A.foo', '5');
+shouldBeFalse('class A { static get foo() {} }; descriptor(A, "foo").enumerable');
+shouldBeFalse('class A { static get foo() {} }; enumeratedProperties(A).includes("foo")');
+shouldBeFalse('class A { static get foo() {} }; enumeratedProperties(new A).includes("foo")');
+shouldBeTrue('class A { static get foo() {} }; descriptor(A, "foo").configurable');
+shouldBe('class A { static get foo() {} }; Object.defineProperty(A, "foo", {value: "bar"}); A.foo', '"bar"');
+
+shouldBeTrue('class A { foo() {} }; descriptor(A.prototype, "foo").writable');
+shouldBe('class A { foo() {} }; A.prototype.foo = 3; A.prototype.foo', '3');
+shouldBeFalse('class A { foo() {} }; descriptor(A.prototype, "foo").enumerable');
+shouldBeFalse('class A { foo() {} }; enumeratedProperties(A.prototype).includes("foo")');
+shouldBeFalse('class A { foo() {} }; enumeratedProperties(new A).includes("foo")');
+shouldBeTrue('class A { foo() {} }; descriptor(A.prototype, "foo").configurable');
+shouldBe('class A { foo() {} }; Object.defineProperty(A.prototype, "foo", {value: "bar"}); A.prototype.foo', '"bar"');
+
+shouldBe('class A { get foo() {} }; descriptor(A.prototype, "foo").writable', 'undefined');
+shouldBe('class A { get foo() { return 5; } }; A.prototype.foo = 3; A.prototype.foo', '5');
+shouldBeFalse('class A { get foo() {} }; descriptor(A.prototype, "foo").enumerable');
+shouldBeFalse('class A { get foo() {} }; enumeratedProperties(A.prototype).includes("foo")');
+shouldBeFalse('class A { get foo() {} }; enumeratedProperties(new A).includes("foo")');
+shouldBeTrue('class A { get foo() {} }; descriptor(A.prototype, "foo").configurable');
+shouldBe('class A { get foo() {} }; Object.defineProperty(A.prototype, "foo", {value: "bar"}); A.prototype.foo', '"bar"');
+
+shouldBeTrue('class A { }; descriptor(A.prototype, "constructor").writable');
+shouldBe('class A { }; A.prototype.constructor = 3; A.prototype.constructor', '3');
+shouldBeTrue('class A { }; x = {}; A.prototype.constructor = function () { return x; }; (new A) instanceof A');
+shouldBeFalse('class A { }; descriptor(A.prototype, "constructor").enumerable');
+shouldBeFalse('class A { }; enumeratedProperties(A.prototype).includes("constructor")');
+shouldBeFalse('class A { }; enumeratedProperties(new A).includes("constructor")');
+shouldBeTrue('class A { }; descriptor(A.prototype, "constructor").configurable');
+shouldBe('class A { }; Object.defineProperty(A.prototype, "constructor", {value: "bar"}); A.prototype.constructor', '"bar"');
+
+var successfullyParsed = true;