blob: 8f9b8ee660ae38fa52029a9ad7be4f4372aa47dd [file] [log] [blame]
// This file was procedurally generated from the following sources:
// - src/dstr-assignment-for-await/array-rest-lref.case
// - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
/*---
description: Reference is evaluated during assignment (for-await-of statement in an async generator declaration)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [Symbol.iterator, destructuring-binding, async-iteration]
flags: [generated, 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.
[...]
ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
[...]
4. Let result be the result of performing
IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
with iteratorRecord as the argument.
5. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
ArrayLiteral, then
a. Let lref be the result of evaluating DestructuringAssignmentTarget.
b. ReturnIfAbrupt(lref).
[...]
---*/
let nextCount = 0;
let returnCount = 0;
let iterator = {
next() {
nextCount += 1;
return { done: true };
},
return() {
returnCount += 1;
}
};
let obj = {};
let iterable = {
[Symbol.iterator]() {
return iterator;
}
};
let iterCount = 0;
async function * fn() {
for await ([...obj['a' + 'b']] of [iterable]) {
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 0);
assert(!!obj.ab);
assert.sameValue(obj.ab.length, 0);
iterCount += 1;
}
}
let iter = fn();
iter.next()
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
.then($DONE, $DONE);