async-gen-decl-dstr-array-elem-iter-thrw-close-skip.js (1971B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-iter-thrw-close-skip.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: IteratorClose is not called when iteration produces an abrupt completion (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 [...] 31 4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result). 32 5. Return result. 33 34 ---*/ 35 let nextCount = 0; 36 let returnCount = 0; 37 let iterator = { 38 next() { 39 nextCount += 1; 40 throw new Test262Error(); 41 }, 42 return() { 43 returnCount += 1; 44 } 45 }; 46 let iterable = { 47 [Symbol.iterator]() { 48 return iterator; 49 } 50 }; 51 let _; 52 53 54 let iterCount = 0; 55 async function * fn() { 56 for await ([ x ] of [iterable]) { 57 58 iterCount += 1; 59 } 60 } 61 62 let iter = fn(); 63 64 iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => { 65 assert.sameValue(nextCount, 1); 66 assert.sameValue(returnCount, 0); 67 }).then($DONE, $DONE);