dflt-obj-ptrn-prop-id-init.js (1242B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/obj-ptrn-prop-id-init.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Binding as specified via property name, identifier, and initializer (async generator function declaration (default parameter)) 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 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 21 22 SingleNameBinding : BindingIdentifier Initializeropt 23 24 [...] 25 8. Return InitializeReferencedBinding(lhs, v). 26 ---*/ 27 28 29 var callCount = 0; 30 async function* f({ x: y = 33 } = { }) { 31 assert.sameValue(y, 33); 32 assert.throws(ReferenceError, function() { 33 x; 34 }); 35 callCount = callCount + 1; 36 }; 37 f().next().then(() => { 38 assert.sameValue(callCount, 1, 'invoked exactly once'); 39 }).then($DONE, $DONE);