async-gen-dstr-var-ary-init-iter-close.js (1986B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-init-iter-close.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template 5 /*--- 6 description: Iterator is closed when not exhausted by pattern evaluation (for-await-of statement) 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 ( var ForBinding of AssignmentExpression ) Statement 13 14 [...] 15 2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 16 varBinding, labelSet, async). 17 18 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 19 20 [...] 21 4. Let destructuring be IsDestructuring of lhs. 22 [...] 23 6. Repeat 24 [...] 25 j. If destructuring is false, then 26 [...] 27 k. Else 28 i. If lhsKind is assignment, then 29 [...] 30 ii. Else if lhsKind is varBinding, then 31 1. Assert: lhs is a ForBinding. 32 2. Let status be the result of performing BindingInitialization 33 for lhs passing nextValue and undefined as the arguments. 34 [...] 35 36 13.3.3.5 Runtime Semantics: BindingInitialization 37 38 BindingPattern : ArrayBindingPattern 39 40 [...] 41 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 42 result). 43 [...] 44 45 ---*/ 46 var doneCallCount = 0; 47 var iter = {}; 48 iter[Symbol.iterator] = function() { 49 return { 50 next() { 51 return { value: null, done: false }; 52 }, 53 return() { 54 doneCallCount += 1; 55 return {}; 56 } 57 }; 58 }; 59 60 var iterCount = 0; 61 62 async function *fn() { 63 for await (var [x] of [iter]) { 64 assert.sameValue(doneCallCount, 1); 65 66 iterCount += 1; 67 } 68 } 69 70 fn().next() 71 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 72 .then($DONE, $DONE);