mirror of https://github.com/tc39/test262.git
44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
// This file was procedurally generated from the following sources:
|
|
// - src/dstr-assignment-for-await/array-elem-init-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 an AssignmentElement outside of a generator function body, it behaves 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 = 4;
|
|
let x;
|
|
|
|
let iterCount = 0;
|
|
async function fn() {
|
|
for await ([ x = yield ] of [[]]) {
|
|
assert.sameValue(x, 4);
|
|
|
|
iterCount += 1;
|
|
}
|
|
}
|
|
|
|
let promise = fn();
|
|
|
|
promise
|
|
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
|
|
.then($DONE, $DONE);
|