Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (C) 2017 Caio Lima. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: Mapped arguments property descriptor change with non-configurable and non-writable property
info: |
Mapping stop working when property is set to non-writable. Change the
descriptor with two [[DefineOwnProperty]] calls. The descriptor's value need to be
the one set before the property be configured as writable: false.
flags: [noStrict]
esid: sec-arguments-exotic-objects-defineownproperty-p-desc
includes: [propertyHelper.js]
---*/
function fn(a) {
Object.defineProperty(arguments, "0", {configurable: false});
Object.defineProperty(arguments, "0", {writable: false});
verifyProperty(arguments, "0", {
value: 1,
writable: false,
enumerable: true,
configurable: false,
});
// Postcondition: Arguments mapping is removed.
a = 2;
verifyProperty(arguments, "0", {
value: 1,
writable: false,
enumerable: true,
configurable: false,
});
}
fn(1);
reportCompare(0, 0);