async-func-dstr-var-ary-ptrn-elem-id-init-skipped.js (2117B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elem-id-init-skipped.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-var.template 5 /*--- 6 description: Destructuring initializer is not evaluated when value is not `undefined` (for-await-of statement) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [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 SingleNameBinding : BindingIdentifier Initializer_opt 39 40 [...] 41 6. If Initializer is present and v is undefined, then 42 [...] 43 7. If environment is undefined, return PutValue(lhs, v). 44 7. Return InitializeReferencedBinding(lhs, v). 45 ---*/ 46 var initCount = 0; 47 function counter() { 48 initCount += 1; 49 } 50 51 var iterCount = 0; 52 53 async function fn() { 54 for await (var [w = counter(), x = counter(), y = counter(), z = counter()] of [[null, 0, false, '']]) { 55 assert.sameValue(w, null); 56 assert.sameValue(x, 0); 57 assert.sameValue(y, false); 58 assert.sameValue(z, ''); 59 assert.sameValue(initCount, 0); 60 61 iterCount += 1; 62 } 63 } 64 65 fn() 66 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 67 .then($DONE, $DONE);