async-gen-dstr-let-ary-ptrn-rest-ary-elem.js (2824B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-rest-ary-elem.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-let.template 5 /*--- 6 description: Rest element containing an array BindingElementList pattern (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 ( 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 40 41 BindingRestElement : ... BindingPattern 42 43 1. Let A be ArrayCreate(0). 44 [...] 45 3. Repeat 46 [...] 47 b. If iteratorRecord.[[done]] is true, then 48 i. Return the result of performing BindingInitialization of 49 BindingPattern with A and environment as the arguments. 50 [...] 51 52 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 53 54 SingleNameBinding : BindingIdentifier Initializer_opt 55 56 [...] 57 3. If iteratorRecord.[[done]] is false, then 58 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 59 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 60 c. ReturnIfAbrupt(next). 61 d. If next is false, set iteratorRecord.[[done]] to true. 62 e. Else, 63 i. Let v be IteratorValue(next). 64 ii. If v is an abrupt completion, set 65 iteratorRecord.[[done]] to true. 66 iii. ReturnIfAbrupt(v). 67 4. If iteratorRecord.[[done]] is true, let v be undefined. 68 [...] 69 7. Return InitializeReferencedBinding(lhs, v). 70 ---*/ 71 72 var iterCount = 0; 73 74 async function *fn() { 75 for await (let [...[x, y, z]] of [[3, 4, 5]]) { 76 assert.sameValue(x, 3); 77 assert.sameValue(y, 4); 78 assert.sameValue(z, 5); 79 80 iterCount += 1; 81 } 82 } 83 84 fn().next() 85 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 86 .then($DONE, $DONE);