async-gen-decl-dstr-array-elem-iter-nrml-close-skip.js (1962B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-iter-nrml-close-skip.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: IteratorClose is not called when assignment evaluation has exhausted the iterator (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 _; 38 let iterator = { 39 next() { 40 nextCount += 1; 41 return { done: true }; 42 }, 43 return() { 44 returnCount += 1; 45 return {}; 46 } 47 }; 48 let iterable = { 49 [Symbol.iterator]() { 50 return iterator; 51 } 52 }; 53 54 let iterCount = 0; 55 async function * fn() { 56 for await ([ _ ] of [iterable]) { 57 assert.sameValue(nextCount, 1); 58 assert.sameValue(returnCount, 0); 59 60 iterCount += 1; 61 } 62 } 63 64 let iter = fn(); 65 66 iter.next().then(() => { 67 assert.sameValue(iterCount, 1); 68 }).then($DONE, $DONE);