async-gen-dstr-var-ary-ptrn-elision.js (2294B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elision.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template 5 /*--- 6 description: Elision advances iterator (for-await-of statement) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [generators, 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 37 38 ArrayBindingPattern : [ Elision ] 39 40 1. Return the result of performing 41 IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord 42 as the argument. 43 44 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation 45 46 Elision : , 47 48 1. If iteratorRecord.[[done]] is false, then 49 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 50 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 51 c. ReturnIfAbrupt(next). 52 d. If next is false, set iteratorRecord.[[done]] to true. 53 2. Return NormalCompletion(empty). 54 55 ---*/ 56 var first = 0; 57 var second = 0; 58 function* g() { 59 first += 1; 60 yield; 61 second += 1; 62 }; 63 64 var iterCount = 0; 65 66 async function *fn() { 67 for await (var [,] of [g()]) { 68 assert.sameValue(first, 1); 69 assert.sameValue(second, 0); 70 71 iterCount += 1; 72 } 73 } 74 75 fn().next() 76 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 77 .then($DONE, $DONE);