async-gen-decl-dstr-array-elem-iter-nrml-close-err.js (2101B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-iter-nrml-close-err.case 4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template 5 /*--- 6 description: Abrupt completion returned from IteratorClose (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 33 ---*/ 34 let nextCount = 0; 35 let returnCount = 0; 36 let _; 37 let iterator = { 38 next() { 39 nextCount += 1; 40 // Set an upper-bound to limit unnecessary iteration in non-conformant 41 // implementations 42 return { done: nextCount > 10 }; 43 }, 44 return() { 45 returnCount += 1; 46 throw new Test262Error(); 47 } 48 }; 49 let iterable = { 50 [Symbol.iterator]() { 51 return iterator; 52 } 53 }; 54 55 let iterCount = 0; 56 async function * fn() { 57 for await ([ _ ] of [iterable]) { 58 59 iterCount += 1; 60 } 61 } 62 63 let iter = fn(); 64 65 iter.next().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => { 66 assert.sameValue(nextCount, 1); 67 assert.sameValue(returnCount, 1); 68 assert.sameValue(constructor, Test262Error); 69 }).then($DONE, $DONE);