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
|
// |reftest| async
// This file was procedurally generated from the following sources:
// - src/dstr-assignment-for-await/obj-prop-nested-obj-yield-ident-valid.case
// - src/dstr-assignment-for-await/async-function/async-func-decl.template
/*---
description: When a `yield` token appears within the Initializer of a nested destructuring assignment and outside of a generator function body, it should behave as an IdentifierReference. (for-await-of statement in an async function declaration)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [destructuring-binding, async-iteration]
flags: [generated, noStrict, async]
info: |
IterationStatement :
for await ( 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
[...]
5. 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.
[...]
---*/
let yield = 2;
let result, x;
let iterCount = 0;
async function fn() {
for await ({ x: { x = yield } } of [{ x: {} }]) {
assert.sameValue(x, 2);
iterCount += 1;
}
}
let promise = fn();
promise
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
.then($DONE, $DONE);
|
