mirror of https://github.com/tc39/test262.git
51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
// This file was procedurally generated from the following sources:
|
|
// - src/dstr-assignment-for-await/obj-prop-nested-obj-yield-expr.case
|
|
// - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
|
|
/*---
|
|
description: When a `yield` token appears within the Initializer of a nested destructuring assignment and within a generator function body, it should behave as a YieldExpression. (for-await-of statement in an async generator declaration)
|
|
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
|
|
features: [generators, 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 = undefined;
|
|
|
|
|
|
let iterCount = 0;
|
|
async function * fn() {
|
|
for await ({ x: { x = yield } } of [{ x: {} }]) {
|
|
|
|
iterCount += 1;
|
|
}
|
|
}
|
|
|
|
let iter = fn();
|
|
|
|
iter.next().then(result => {
|
|
assert.sameValue(result.value, undefined);
|
|
assert.sameValue(result.done, false);
|
|
assert.sameValue(x, undefined);
|
|
|
|
iter.next(4).then(result => {
|
|
assert.sameValue(result.value, undefined);
|
|
assert.sameValue(result.done, true);
|
|
assert.sameValue(x, 4);
|
|
}).then($DONE, $DONE);
|
|
});
|