mirror of https://github.com/tc39/test262.git
94 lines
2.7 KiB
JavaScript
94 lines
2.7 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-assignment-for-await/array-elem-trlg-iter-elision-iter-nrml-close.case
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// - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
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/*---
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description: IteratorClose invoked when elision does not exhaust the iterator (for-await-of statement in an async generator declaration)
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esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
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features: [Symbol.iterator, destructuring-binding, async-iteration]
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flags: [generated, async]
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info: |
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IterationStatement :
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for await ( LeftHandSideExpression of AssignmentExpression ) Statement
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1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
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AssignmentExpression, iterate).
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2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
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keyResult, assignment, labelSet).
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13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
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[...]
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5. If destructuring is true and if lhsKind is assignment, then
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a. Assert: lhs is a LeftHandSideExpression.
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b. Let assignmentPattern be the parse of the source text corresponding to
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lhs using AssignmentPattern as the goal symbol.
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[...]
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ArrayAssignmentPattern :
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[ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
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[...]
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5. If Elision is present, then
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a. Let status be the result of performing
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IteratorDestructuringAssignmentEvaluation of Elision with
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iteratorRecord as the argument.
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b. If status is an abrupt completion, then
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[...]
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7. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
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status).
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7.4.6 IteratorClose ( iterator, completion )
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[...]
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5. Let innerResult be Call(return, iterator, « »).
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[...]
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---*/
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let nextCount = 0;
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let returnCount = 0;
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let thisValue = null;
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let args = null;
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let x;
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let iterator = {
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next() {
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nextCount += 1;
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// Set an upper-bound to limit unnecessary iteration in non-conformant
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// implementations
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return { done: nextCount > 10 };
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},
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return() {
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returnCount += 1;
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thisValue = this;
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args = arguments;
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return {};
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}
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};
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let iterable = {
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[Symbol.iterator]() {
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return iterator;
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}
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};
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let iterCount = 0;
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async function * fn() {
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for await ([ x , , ] of [iterable]) {
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assert.sameValue(nextCount, 2);
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assert.sameValue(returnCount, 1);
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assert.sameValue(thisValue, iterator, 'correct `this` value');
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assert(!!args, 'arguments object provided');
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assert.sameValue(args.length, 0, 'zero arguments specified');
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iterCount += 1;
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}
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}
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let iter = fn();
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iter.next()
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.then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
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.then($DONE, $DONE);
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