async-func-decl-dstr-array-elem-iter-nrml-close.js (2500B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/array-elem-iter-nrml-close.case 4 // - src/dstr-assignment-for-await/default/async-func-decl.template 5 /*--- 6 description: IteratorClose is called when assignment evaluation has not exhausted the iterator (for-await-of statement in an async function 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 7.4.6 IteratorClose ( iterator, completion ) 35 36 [...] 37 5. Let innerResult be Call(return, iterator, « »). 38 [...] 39 40 ---*/ 41 let nextCount = 0; 42 let returnCount = 0; 43 let thisValue = null; 44 let args = null; 45 let _; 46 let iterable = {}; 47 let iterator = { 48 next() { 49 nextCount += 1; 50 // Set an upper-bound to limit unnecessary iteration in non-conformant 51 // implementations 52 return { done: nextCount > 10 }; 53 }, 54 return() { 55 returnCount += 1; 56 thisValue = this; 57 args = arguments; 58 return {}; 59 } 60 }; 61 iterable[Symbol.iterator] = function() { 62 return iterator; 63 }; 64 65 let iterCount = 0; 66 async function fn() { 67 for await ([ _ ] of [iterable]) { 68 assert.sameValue(nextCount, 1); 69 assert.sameValue(returnCount, 1); 70 assert.sameValue(thisValue, iterator, 'correct `this` value'); 71 assert(!!args, 'arguments object provided'); 72 assert.sameValue(args.length, 0, 'zero arguments specified'); 73 74 iterCount += 1; 75 } 76 } 77 78 let promise = fn(); 79 80 promise 81 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 82 .then($DONE, $DONE);