mirror of https://github.com/tc39/test262.git
65 lines
1.8 KiB
JavaScript
65 lines
1.8 KiB
JavaScript
// This file was procedurally generated from the following sources:
|
|
// - src/dstr-binding-for-await/obj-ptrn-empty.case
|
|
// - src/dstr-binding-for-await/default/for-await-of-async-func-let.template
|
|
/*---
|
|
description: No property access occurs for an "empty" object binding pattern (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.
|
|
[...]
|
|
|
|
Runtime Semantics: BindingInitialization
|
|
|
|
ObjectBindingPattern : { }
|
|
|
|
1. Return NormalCompletion(empty).
|
|
---*/
|
|
var accessCount = 0;
|
|
var obj = Object.defineProperty({}, 'attr', {
|
|
get: function() {
|
|
accessCount += 1;
|
|
}
|
|
});
|
|
|
|
var iterCount = 0;
|
|
|
|
async function fn() {
|
|
for await (let {} of [obj]) {
|
|
assert.sameValue(accessCount, 0);
|
|
|
|
iterCount += 1;
|
|
}
|
|
}
|
|
|
|
fn()
|
|
.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
|
|
.then($DONE, $DONE);
|
|
|