async-gen-dstr-var-async-ary-ptrn-elem-ary-rest-iter.js (2453B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-elem-ary-rest-iter.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var-async.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is not 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 1. If iteratorRecord.[[done]] is false, then 44 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 45 [...] 46 e. Else, 47 i. Let v be IteratorValue(next). 48 [...] 49 4. Return the result of performing BindingInitialization of BindingPattern 50 with v and environment as the arguments. 51 ---*/ 52 var values = [2, 1, 3]; 53 var initCount = 0; 54 55 var iterCount = 0; 56 var asyncIter = (async function*() { 57 yield* [[values]]; 58 })(); 59 60 async function *fn() { 61 for await (var [[...x] = function() { initCount += 1; }()] of asyncIter) { 62 assert(Array.isArray(x)); 63 assert.sameValue(x[0], 2); 64 assert.sameValue(x[1], 1); 65 assert.sameValue(x[2], 3); 66 assert.sameValue(x.length, 3); 67 assert.notSameValue(x, values); 68 assert.sameValue(initCount, 0); 69 70 iterCount += 1; 71 } 72 } 73 74 fn().next() 75 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 76 .then($DONE, $DONE);