async-func-dstr-var-ary-ptrn-elem-ary-elision-init.js (2166B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elem-ary-elision-init.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-var.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is used (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 BindingElement : BindingPattern Initializer_opt 39 40 [...] 41 2. If iteratorRecord.[[done]] is true, let v be undefined. 42 3. If Initializer is present and v is undefined, then 43 a. Let defaultValue be the result of evaluating Initializer. 44 b. Let v be ? GetValue(defaultValue). 45 4. Return the result of performing BindingInitialization of BindingPattern 46 with v and environment as the arguments. 47 48 ---*/ 49 var first = 0; 50 var second = 0; 51 function* g() { 52 first += 1; 53 yield; 54 second += 1; 55 }; 56 57 var iterCount = 0; 58 59 async function fn() { 60 for await (var [[,] = g()] of [[]]) { 61 assert.sameValue(first, 1); 62 assert.sameValue(second, 0); 63 64 iterCount += 1; 65 } 66 } 67 68 fn() 69 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 70 .then($DONE, $DONE);