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
64
65
66
67
68
69
70
71
|
// This file was procedurally generated from the following sources:
// - src/dstr-assignment/array-rest-elision-iter-abpt.case
// - src/dstr-assignment/error/for-of.template
/*---
description: IteratorClose is not called when assignment evaluation produces an abrupt completion (For..of statement)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [Symbol.iterator, destructuring-binding]
flags: [generated]
info: |
IterationStatement :
for ( LeftHandSideExpression of AssignmentExpression ) Statement
1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
AssignmentExpression, iterate).
2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
keyResult, assignment, labelSet).
13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
[...]
4. If destructuring is true and if lhsKind is assignment, then
a. Assert: lhs is a LeftHandSideExpression.
b. Let assignmentPattern be the parse of the source text corresponding to
lhs using AssignmentPattern as the goal symbol.
[...]
ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
[...]
4. If Elision is present, then
a. Let status be the result of performing
IteratorDestructuringAssignmentEvaluation of Elision with
iteratorRecord as the argument.
b. If status is an abrupt completion, then
i. If iteratorRecord.[[done]] is false, return
IteratorClose(iterator, status).
ii. Return Completion(status).
---*/
var nextCount = 0;
var returnCount = 0;
var iterable = {};
var iterator = {
next: function() {
nextCount += 1;
throw new Test262Error();
},
return: function() {
returnCount += 1;
}
};
iterable[Symbol.iterator] = function() {
return iterator;
};
var x;
var counter = 0;
assert.throws(Test262Error, function() {
for ([ , ...x] of [iterable]) {
counter += 1;
}
counter += 1;
});
assert.sameValue(counter, 0);
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 0);
reportCompare(0, 0);
|
