Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| async
// This file was procedurally generated from the following sources:
// - src/dstr-assignment-for-await/array-elem-nested-obj-null.case
// - src/dstr-assignment-for-await/default/async-gen-decl.template
/*---
description: When DestructuringAssignmentTarget is an object literal and the value is `null`, a TypeError should be thrown. (for-await-of statement in an async generator declaration)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
features: [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.
[...]
---*/
let x;
let iterCount = 0;
async function * fn() {
for await ([{ x }] of [[null]]) {
iterCount += 1;
}
}
let promise = fn().next();
promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
assert.sameValue(iterCount, 0);
assert.sameValue(constructor, TypeError);
}).then($DONE, $DONE);