ary-ptrn-elem-ary-empty-iter.js (1485B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-ary-empty-iter.case 4 // - src/dstr-binding/default/async-gen-func-decl.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is not used (async generator function declaration) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, 16 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 var initCount = 0; 34 35 36 var callCount = 0; 37 async function* f([[] = function() { initCount += 1; }()]) { 38 assert.sameValue(initCount, 0); 39 callCount = callCount + 1; 40 }; 41 f([[23]]).next().then(() => { 42 assert.sameValue(callCount, 1, 'invoked exactly once'); 43 }).then($DONE, $DONE);