mirror of https://github.com/tc39/test262.git
29 lines
1.0 KiB
JavaScript
Executable File
29 lines
1.0 KiB
JavaScript
Executable File
// Copyright (C) 2015 André Bargull. 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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info: Mapped arguments object with non-configurable property
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description: >
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Mapped arguments property is changed to non-configurable and
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non-writable. Perform property attribute changes with two
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[[DefineOwnProperty]] calls. Add intervening call to
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SetMutableBinding.
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flags: [noStrict]
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---*/
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function argumentsNonConfigurableThenNonWritableWithInterveningSetMutableBinding(a) {
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Object.defineProperty(arguments, "0", {configurable: false});
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a = 2;
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Object.defineProperty(arguments, "0", {writable: false});
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assert.sameValue(a, 2);
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// `arguments[0] === 1` per ES2015, Rev 38, April 14, 2015 Final Draft.
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// Specification bug: https://bugs.ecmascript.org/show_bug.cgi?id=4371
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assert.sameValue(arguments[0], 2);
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// Postcondition: Arguments mapping is removed.
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a = 3;
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assert.sameValue(a, 3);
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assert.sameValue(arguments[0], 2);
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}
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argumentsNonConfigurableThenNonWritableWithInterveningSetMutableBinding(1);
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