async-gen-decl-dstr-array-elem-iter-get-err.js (1682B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-iter-get-err.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: Abrupt completion returned from GetIterator (for-await-of statement in an async generator declaration) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [Symbol.iterator, destructuring-binding, async-iteration] 9 flags: [generated, async] 10 info: | 11 IterationStatement : 12 for await ( LeftHandSideExpression of AssignmentExpression ) Statement 13 14 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », 15 AssignmentExpression, iterate). 16 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, 17 keyResult, assignment, labelSet). 18 19 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 20 21 [...] 22 5. If destructuring is true and if lhsKind is assignment, then 23 a. Assert: lhs is a LeftHandSideExpression. 24 b. Let assignmentPattern be the parse of the source text corresponding to 25 lhs using AssignmentPattern as the goal symbol. 26 [...] 27 28 ArrayAssignmentPattern : [ AssignmentElementList ] 29 30 1. Let iterator be ? GetIterator(value). 31 32 ---*/ 33 let iterable = { 34 [Symbol.iterator]() { 35 throw new Test262Error(); 36 } 37 }; 38 let _; 39 40 41 let iterCount = 0; 42 async function * fn() { 43 for await ([ _ ] of [iterable]) { 44 45 iterCount += 1; 46 } 47 } 48 49 let iter = fn(); 50 51 iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => { 52 assert.sameValue(constructor, Test262Error); 53 }).then($DONE, $DONE);