dflt-ary-ptrn-elision-exhausted.js (1439B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elision-exhausted.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Elision accepts exhausted iterator (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [generators, 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 ArrayBindingPattern : [ Elision ] 23 24 1. Return the result of performing 25 IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord 26 as the argument. 27 28 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation 29 30 Elision : , 31 32 1. If iteratorRecord.[[done]] is false, then 33 [...] 34 2. Return NormalCompletion(empty). 35 36 ---*/ 37 var iter = function*() {}(); 38 iter.next(); 39 40 41 var callCount = 0; 42 async function* f([,] = iter) { 43 44 callCount = callCount + 1; 45 }; 46 f().next().then(() => { 47 assert.sameValue(callCount, 1, 'invoked exactly once'); 48 }).then($DONE, $DONE);