1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
// 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 to non-writable and non-configurable
info: |
Mapping stop working when property is set to non-writable. Here we change the
descriptor using [[DefineOwnProperty]] to {writable: false} and then
change property descriptor to {configurable: false} in sequence.
The property descriptor 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", {writable: false});
Object.defineProperty(arguments, "0", {configurable: false});
let propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
assert.sameValue(propertyDescriptor.value, 1);
verifyEnumerable(arguments, "0");
verifyNotWritable(arguments, "0");
verifyNotConfigurable(arguments, "0");
// Postcondition: Arguments mapping is removed. Descriptors need to be the same
// as above.
a = 2;
propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
assert.sameValue(propertyDescriptor.value, 1);
verifyEnumerable(arguments, "0");
verifyNotWritable(arguments, "0");
verifyNotConfigurable(arguments, "0");
}
fn(1);
|
