mirror of https://github.com/tc39/test262.git
43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
// Copyright (C) 2017 Caio Lima. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: Mapped arguments property descriptor change to non-configurable and non-writable
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info: |
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Mapping just stop working when property is set to non-writable. Change the
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descriptor using [[DefineOwnProperty]] to {configurable: false}, set arguments[0] = 2
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and then change property descriptor to {writable: false}.
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The descriptor's value need to be the one set before the property be
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configured as {writable: false}.
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flags: [noStrict]
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esid: sec-arguments-exotic-objects-defineownproperty-p-desc
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includes: [propertyHelper.js]
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---*/
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function fn(a) {
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Object.defineProperty(arguments, "0", {configurable: false});
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arguments[0] = 2;
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Object.defineProperty(arguments, "0", {writable: false});
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assert.sameValue(a, 2)
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verifyProperty(arguments, "0", {
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value: 2,
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writable: false,
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enumerable: true,
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configurable: false,
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});
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// Postcondition: Arguments mapping is removed.
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a = 3;
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verifyProperty(arguments, "0", {
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value: 2,
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writable: false,
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enumerable: true,
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configurable: false,
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});
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}
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fn(1);
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