// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-assignment-for-await/array-rest-nested-array-undefined-own.case // - src/dstr-assignment-for-await/default/async-gen-decl.template /*--- description: When DestructuringAssignmentTarget is an array literal and the iterable emits `undefined` as the only value, an array with a single `undefined` element should be used as the value of the nested DestructuringAssignment. (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 = null; let iterCount = 0; async function * fn() { for await ([...[x]] of [[undefined]]) { assert.sameValue(x, undefined); iterCount += 1; } } let promise = fn().next(); promise .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) .then($DONE, $DONE);