async-gen-decl-dstr-array-elem-trlg-iter-rest-nrml-close-skip.js (2409B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-trlg-iter-rest-nrml-close-skip.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: IteratorClose is not called when rest element 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 : 29 [ AssignmentElementList , Elisionopt AssignmentRestElementopt ] 30 31 [...] 32 6. If AssignmentRestElement is present, then 33 a. Let status be the result of performing 34 IteratorDestructuringAssignmentEvaluation of AssignmentRestElement 35 with iteratorRecord as the argument. 36 7. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, status). 37 8. Return Completion(status). 38 39 ---*/ 40 let nextCount = 0; 41 let returnCount = 0; 42 let x, y; 43 let iterator = { 44 next() { 45 nextCount += 1; 46 return { value: nextCount, done: nextCount > 1 }; 47 }, 48 return() { 49 returnCount += 1; 50 } 51 }; 52 let iterable = { 53 [Symbol.iterator]() { 54 return iterator; 55 } 56 }; 57 58 let iterCount = 0; 59 async function * fn() { 60 for await ([ x , ...y ] of [iterable]) { 61 62 iterCount += 1; 63 } 64 } 65 66 let iter = fn(); 67 68 iter.next().then(() => { 69 iter.return().then(() => { 70 assert.sameValue(nextCount, 2, 'nextCount'); 71 assert.sameValue(returnCount, 0, 'returnCount'); 72 assert.sameValue(x, 1, 'x'); 73 assert.sameValue(y.length, 0, 'y.length'); 74 }).then($DONE, $DONE); 75 }, $DONE).catch($DONE);