ary-ptrn-elem-ary-elision-iter.js (1487B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-ary-elision-iter.case 4 // - src/dstr-binding/default/async-gen-func-expr.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is not used (async generator function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [generators, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) { 12 AsyncGeneratorBody } 13 14 [...] 15 3. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, scope, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 BindingElement : BindingPatternInitializer opt 23 24 1. If iteratorRecord.[[done]] is false, then 25 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 26 [...] 27 e. Else, 28 i. Let v be IteratorValue(next). 29 [...] 30 4. Return the result of performing BindingInitialization of BindingPattern 31 with v and environment as the arguments. 32 33 ---*/ 34 var callCount = 0; 35 function* g() { 36 callCount += 1; 37 }; 38 39 40 var callCount = 0; 41 var f; 42 f = async function*([[,] = g()]) { 43 assert.sameValue(callCount, 0); 44 callCount = callCount + 1; 45 }; 46 47 f([[]]).next().then(() => { 48 assert.sameValue(callCount, 1, 'invoked exactly once'); 49 }).then($DONE, $DONE);