Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| async
// This file was procedurally generated from the following sources:
// - src/dstr-binding-for-await/ary-ptrn-elem-id-init-fn-name-arrow.case
// - src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.template
/*---
description: SingleNameBinding does assign name to arrow functions (for-await-of statement)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [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
SingleNameBinding : BindingIdentifier Initializer_opt
[...]
5. If Initializer is present and v is undefined, then
a. Let defaultValue be the result of evaluating Initializer.
b. Set v to ? GetValue(defaultValue).
c. If IsAnonymousFunctionDefinition(Initializer) is true, then
[...]
6. If environment is undefined, return PutValue(lhs, v).
7. Return InitializeReferencedBinding(lhs, v).
---*/
var iterCount = 0;
var asyncIter = (async function*() {
yield* [[]];
})();
async function *fn() {
for await (let [arrow = () => {}] of asyncIter) {
assert.sameValue(arrow.name, 'arrow');
iterCount += 1;
}
}
fn().next()
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
.then($DONE, $DONE);