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
37
38
39
40
41
42
43
44
45
46
47
|
// |reftest| module
// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: >
Mutable bindings are created in the lexical environment record prior to
execution for `let` declarations
esid: sec-moduledeclarationinstantiation
info: |
[...]
17. For each element d in lexDeclarations do
a. For each element dn of the BoundNames of d do
i. If IsConstantDeclaration of d is true, then
[...]
ii. Else,
1. Perform ! envRec.CreateMutableBinding(dn, false).
[...]
includes: [fnGlobalObject.js]
flags: [module]
---*/
var global = fnGlobalObject();
assert.throws(ReferenceError, function() {
typeof test262;
}, 'Binding is created but not initialized.');
assert.sameValue(
Object.getOwnPropertyDescriptor(global, 'test262'), undefined
);
let test262;
assert.sameValue(test262, undefined);
assert.sameValue(
Object.getOwnPropertyDescriptor(global, 'test262'), undefined
);
test262 = null;
assert.sameValue(test262, null, 'binding is mutable');
assert.sameValue(
Object.getOwnPropertyDescriptor(global, 'test262'),
undefined,
'global binding is not effected by modification'
);
reportCompare(0, 0);
|
