named-dflt-ary-ptrn-elem-id-iter-done.js (1336B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-id-iter-done.case 4 // - src/dstr-binding/default/async-gen-func-named-expr-dflt.template 5 /*--- 6 description: SingleNameBinding when value iteration was completed previously (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 4. If iteratorRecord.[[done]] is false, then 26 [...] 27 5. If iteratorRecord.[[done]] is true, let v be undefined. 28 [...] 29 8. Return InitializeReferencedBinding(lhs, v). 30 ---*/ 31 32 33 var callCount = 0; 34 var f; 35 f = async function* h([_, x] = []) { 36 assert.sameValue(x, undefined); 37 callCount = callCount + 1; 38 }; 39 40 f().next().then(() => { 41 assert.sameValue(callCount, 1, 'invoked exactly once'); 42 }).then($DONE, $DONE);