async-gen-decl-dstr-array-elem-trlg-iter-list-nrml-close-skip.js (2430B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-trlg-iter-list-nrml-close-skip.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: IteratorClose is not invoked when evaluation of AssignmentElementList exhausts 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 2. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}. 33 3. Let status be the result of performing 34 IteratorDestructuringAssignmentEvaluation of AssignmentElementList using 35 iteratorRecord as the argument. 36 4. If status is an abrupt completion, then 37 a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, 38 status). 39 b. Return Completion(status). 40 41 ---*/ 42 let nextCount = 0; 43 let returnCount = 0; 44 let thrower = function() { 45 throw new Test262Error(); 46 }; 47 let x; 48 let iterator = { 49 next() { 50 nextCount += 1; 51 return { done: true }; 52 }, 53 return() { 54 returnCount += 1; 55 } 56 }; 57 let iterable = { 58 [Symbol.iterator]() { 59 return iterator; 60 } 61 }; 62 63 let iterCount = 0; 64 async function * fn() { 65 for await ([ x , ] of [iterable]) { 66 assert.sameValue(nextCount, 1); 67 assert.sameValue(returnCount, 0); 68 69 iterCount += 1; 70 } 71 } 72 73 let iter = fn(); 74 75 iter.next() 76 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 77 .then($DONE, $DONE);