mirror of https://github.com/tc39/test262.git
67 lines
2.1 KiB
JavaScript
67 lines
2.1 KiB
JavaScript
// This file was procedurally generated from the following sources:
|
|
// - src/dstr-binding-for-await/ary-ptrn-rest-id-exhausted.case
|
|
// - src/dstr-binding-for-await/default/for-await-of-async-func-const-async.template
|
|
/*---
|
|
description: RestElement applied to an exhausted iterator (for-await-of statement)
|
|
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 ( ForDeclaration of AssignmentExpression ) Statement
|
|
|
|
[...]
|
|
2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
|
|
lexicalBinding, labelSet, async).
|
|
|
|
13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
|
|
|
|
[...]
|
|
4. Let destructuring be IsDestructuring of lhs.
|
|
[...]
|
|
6. Repeat
|
|
[...]
|
|
j. If destructuring is false, then
|
|
[...]
|
|
k. 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.
|
|
[...]
|
|
|
|
13.3.3.6 Runtime Semantics: IteratorBindingInitialization
|
|
BindingRestElement : ... BindingIdentifier
|
|
1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
|
|
environment).
|
|
2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat,
|
|
[...]
|
|
b. If iteratorRecord.[[done]] is true, then
|
|
i. If environment is undefined, return PutValue(lhs, A).
|
|
ii. Return InitializeReferencedBinding(lhs, A).
|
|
|
|
---*/
|
|
|
|
var iterCount = 0;
|
|
var asyncIter = (async function*() {
|
|
yield* [[1, 2]];
|
|
})();
|
|
|
|
async function fn() {
|
|
for await (const [, , ...x] of asyncIter) {
|
|
assert(Array.isArray(x));
|
|
assert.sameValue(x.length, 0);
|
|
|
|
iterCount += 1;
|
|
}
|
|
}
|
|
|
|
fn()
|
|
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
|
|
.then($DONE, $DONE);
|