non-Strict mode Failing
Expected no error, got ESHostError: Expected SameValue(«1», «2») to be true
Features:
- ∅
Expected no error, got ESHostError: Expected SameValue(«1», «2») to be true
// Copyright (C) 2015 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
info: Mapped arguments object with non-configurable property
description: >
Mapped arguments property is changed to non-configurable and
non-writable. Perform property attribute changes with two
[[DefineOwnProperty]] calls. Add intervening call to
SetMutableBinding.
flags: [noStrict]
---*/
function argumentsNonConfigurableThenNonWritableWithInterveningSetMutableBinding(a) {
Object.defineProperty(arguments, "0", {configurable: false});
a = 2;
Object.defineProperty(arguments, "0", {writable: false});
assert.sameValue(a, 2);
// `arguments[0] === 1` per ES2015, Rev 38, April 14, 2015 Final Draft.
// Specification bug: https://bugs.ecmascript.org/show_bug.cgi?id=4371
assert.sameValue(arguments[0], 2);
// Postcondition: Arguments mapping is removed.
a = 3;
assert.sameValue(a, 3);
assert.sameValue(arguments[0], 2);
}
argumentsNonConfigurableThenNonWritableWithInterveningSetMutableBinding(1);