async-gen-dstr-var-ary-ptrn-elem-id-iter-done.js (1863B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elem-id-iter-done.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template 5 /*--- 6 description: SingleNameBinding when value iteration was completed previously (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 3. If iteratorRecord.[[done]] is false, then 42 [...] 43 4. If iteratorRecord.[[done]] is true, let v be undefined. 44 [...] 45 7. Return InitializeReferencedBinding(lhs, v). 46 ---*/ 47 48 var iterCount = 0; 49 50 async function *fn() { 51 for await (var [_, x] of [[]]) { 52 assert.sameValue(x, undefined); 53 54 iterCount += 1; 55 } 56 } 57 58 fn().next() 59 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 60 .then($DONE, $DONE);