named-dflt-ary-ptrn-elem-id-init-exhausted.js (1496B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-id-init-exhausted.case 4 // - src/dstr-binding/default/async-gen-func-named-expr-dflt.template 5 /*--- 6 description: Destructuring initializer with an exhausted iterator (async generator named function expression (default parameter)) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 7. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, funcEnv, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 SingleNameBinding : BindingIdentifier Initializeropt 23 24 [...] 25 5. If iteratorRecord.[[done]] is true, let v be undefined. 26 6. If Initializer is present and v is undefined, then 27 a. Let defaultValue be the result of evaluating Initializer. 28 b. Let v be GetValue(defaultValue). 29 [...] 30 7. If environment is undefined, return PutValue(lhs, v). 31 8. Return InitializeReferencedBinding(lhs, v). 32 ---*/ 33 34 35 var callCount = 0; 36 var f; 37 f = async function* h([x = 23] = []) { 38 assert.sameValue(x, 23); 39 callCount = callCount + 1; 40 }; 41 42 f().next().then(() => { 43 assert.sameValue(callCount, 1, 'invoked exactly once'); 44 }).then($DONE, $DONE);