async-func-dstr-var-ary-ptrn-rest-id-elision.js (2208B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-rest-id-elision.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-var.template 5 /*--- 6 description: Rest element following elision elements (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 ArrayBindingPattern : [ Elisionopt BindingRestElement ] 38 1. If Elision is present, then 39 a. Let status be the result of performing 40 IteratorDestructuringAssignmentEvaluation of Elision with 41 iteratorRecord as the argument. 42 b. ReturnIfAbrupt(status). 43 2. Return the result of performing IteratorBindingInitialization for 44 BindingRestElement with iteratorRecord and environment as arguments. 45 ---*/ 46 var values = [1, 2, 3, 4, 5]; 47 48 var iterCount = 0; 49 50 async function fn() { 51 for await (var [ , , ...x] of [values]) { 52 assert(Array.isArray(x)); 53 assert.sameValue(x.length, 3); 54 assert.sameValue(x[0], 3); 55 assert.sameValue(x[1], 4); 56 assert.sameValue(x[2], 5); 57 assert.notSameValue(x, values); 58 59 iterCount += 1; 60 } 61 } 62 63 fn() 64 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 65 .then($DONE, $DONE);