async-gen-dstr-var-async-ary-init-iter-no-close.js (2164B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-init-iter-no-close.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var-async.template 5 /*--- 6 description: Iterator is not closed when 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 ( ForDeclaration of AssignmentExpression ) Statement 13 14 [...] 15 2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, 16 lexicalBinding, 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 [...] 32 iii. Else, 33 1. Assert: lhsKind is lexicalBinding. 34 2. Assert: lhs is a ForDeclaration. 35 3. Let status be the result of performing BindingInitialization 36 for lhs passing nextValue and iterationEnv as arguments. 37 [...] 38 39 13.3.3.5 Runtime Semantics: BindingInitialization 40 41 BindingPattern : ArrayBindingPattern 42 43 [...] 44 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 45 result). 46 [...] 47 48 ---*/ 49 var doneCallCount = 0; 50 var iter = {}; 51 iter[Symbol.iterator] = function() { 52 return { 53 next() { 54 return { value: null, done: true }; 55 }, 56 return() { 57 doneCallCount += 1; 58 return {}; 59 } 60 }; 61 }; 62 63 var iterCount = 0; 64 var asyncIter = (async function*() { 65 yield* [iter]; 66 })(); 67 68 async function *fn() { 69 for await (var [x] of asyncIter) { 70 assert.sameValue(doneCallCount, 0); 71 72 iterCount += 1; 73 } 74 } 75 76 fn().next() 77 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 78 .then($DONE, $DONE);