ary-ptrn-elem-id-init-exhausted.js (1454B)
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-decl.template 5 /*--- 6 description: Destructuring initializer with an exhausted iterator (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 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 async function* f([x = 23]) { 37 assert.sameValue(x, 23); 38 callCount = callCount + 1; 39 }; 40 f([]).next().then(() => { 41 assert.sameValue(callCount, 1, 'invoked exactly once'); 42 }).then($DONE, $DONE);