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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-prop-obj.case
// - src/dstr-binding/default/for-of-let.template
/*---
description: Object binding pattern with "nested" object binding pattern not using initializer (for-of statement)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [destructuring-binding]
flags: [generated]
info: |
IterationStatement :
for ( ForDeclaration of AssignmentExpression ) Statement
[...]
3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
lexicalBinding, labelSet).
13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
[...]
3. Let destructuring be IsDestructuring of lhs.
[...]
5. Repeat
[...]
h. If destructuring is false, then
[...]
i. Else
i. If lhsKind is assignment, then
[...]
ii. Else if lhsKind is varBinding, then
[...]
iii. Else,
1. Assert: lhsKind is lexicalBinding.
2. Assert: lhs is a ForDeclaration.
3. Let status be the result of performing BindingInitialization
for lhs passing nextValue and iterationEnv as arguments.
[...]
13.3.3.7 Runtime Semantics: KeyedBindingInitialization
[...]
3. If Initializer is present and v is undefined, then
[...]
4. Return the result of performing BindingInitialization for BindingPattern
passing v and environment as arguments.
---*/
var iterCount = 0;
for (let { w: { x, y, z } = { x: 4, y: 5, z: 6 } } of [{ w: { x: undefined, z: 7 } }]) {
assert.sameValue(x, undefined);
assert.sameValue(y, undefined);
assert.sameValue(z, 7);
assert.throws(ReferenceError, function() {
w;
});
iterCount += 1;
}
assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
reportCompare(0, 0);
|
