mirror of https://github.com/tc39/test262.git
68 lines
2.2 KiB
JavaScript
68 lines
2.2 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-binding-for-await/ary-ptrn-rest-id-elision.case
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// - src/dstr-binding-for-await/default/for-await-of-async-func-const.template
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/*---
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description: Rest element following elision elements (for-await-of statement)
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esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
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features: [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 ( ForDeclaration of AssignmentExpression ) Statement
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[...]
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2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
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lexicalBinding, labelSet, async).
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13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
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[...]
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4. Let destructuring be IsDestructuring of lhs.
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[...]
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6. Repeat
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[...]
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j. If destructuring is false, then
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[...]
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k. Else
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i. If lhsKind is assignment, then
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[...]
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ii. Else if lhsKind is varBinding, then
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[...]
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iii. Else,
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1. Assert: lhsKind is lexicalBinding.
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2. Assert: lhs is a ForDeclaration.
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3. Let status be the result of performing BindingInitialization
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for lhs passing nextValue and iterationEnv as arguments.
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[...]
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13.3.3.6 Runtime Semantics: IteratorBindingInitialization
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ArrayBindingPattern : [ Elisionopt BindingRestElement ]
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1. 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. ReturnIfAbrupt(status).
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2. Return the result of performing IteratorBindingInitialization for
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BindingRestElement with iteratorRecord and environment as arguments.
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---*/
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var values = [1, 2, 3, 4, 5];
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var iterCount = 0;
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async function fn() {
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for await (const [ , , ...x] of [values]) {
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assert(Array.isArray(x));
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assert.sameValue(x.length, 3);
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assert.sameValue(x[0], 3);
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assert.sameValue(x[1], 4);
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assert.sameValue(x[2], 5);
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assert.notSameValue(x, values);
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iterCount += 1;
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}
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}
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fn()
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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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