async-gen-dstr-let-async-ary-ptrn-elem-ary-rest-init.js (2404B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-init.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.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: [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 BindingElement : BindingPattern Initializer_opt 42 43 [...] 44 2. If iteratorRecord.[[done]] is true, let v be undefined. 45 3. If Initializer is present and v is undefined, then 46 a. Let defaultValue be the result of evaluating Initializer. 47 b. Let v be ? GetValue(defaultValue). 48 4. Return the result of performing BindingInitialization of BindingPattern 49 with v and environment as the arguments. 50 ---*/ 51 var values = [2, 1, 3]; 52 53 var iterCount = 0; 54 var asyncIter = (async function*() { 55 yield* [[]]; 56 })(); 57 58 async function *fn() { 59 for await (let [[...x] = values] of asyncIter) { 60 assert(Array.isArray(x)); 61 assert.sameValue(x[0], 2); 62 assert.sameValue(x[1], 1); 63 assert.sameValue(x[2], 3); 64 assert.sameValue(x.length, 3); 65 assert.notSameValue(x, values); 66 67 iterCount += 1; 68 } 69 } 70 71 fn().next() 72 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 73 .then($DONE, $DONE);