dflt-ary-ptrn-elem-id-init-fn-name-gen.js (1641B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-id-init-fn-name-gen.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: SingleNameBinding assigns name to "anonymous" generator functions (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 SingleNameBinding : BindingIdentifier Initializeropt 23 24 [...] 25 6. If Initializer is present and v is undefined, then 26 a. Let defaultValue be the result of evaluating Initializer. 27 b. Let v be GetValue(defaultValue). 28 c. ReturnIfAbrupt(v). 29 d. If IsAnonymousFunctionDefinition(Initializer) is true, then 30 [...] 31 7. If environment is undefined, return PutValue(lhs, v). 32 8. Return InitializeReferencedBinding(lhs, v). 33 34 ---*/ 35 36 37 var callCount = 0; 38 async function* f([gen = function* () {}, xGen = function* x() {}] = []) { 39 assert.sameValue(gen.name, 'gen'); 40 assert.notSameValue(xGen.name, 'xGen'); 41 callCount = callCount + 1; 42 }; 43 f().next().then(() => { 44 assert.sameValue(callCount, 1, 'invoked exactly once'); 45 }).then($DONE, $DONE);