named-dflt-obj-ptrn-empty.js (1240B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/obj-ptrn-empty.case 4 // - src/dstr-binding/default/async-gen-func-named-expr-dflt.template 5 /*--- 6 description: No property access occurs for an "empty" object binding pattern (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 Runtime Semantics: BindingInitialization 21 22 ObjectBindingPattern : { } 23 24 1. Return NormalCompletion(empty). 25 ---*/ 26 var accessCount = 0; 27 var obj = Object.defineProperty({}, 'attr', { 28 get: function() { 29 accessCount += 1; 30 } 31 }); 32 33 34 var callCount = 0; 35 var f; 36 f = async function* h({} = obj) { 37 assert.sameValue(accessCount, 0); 38 callCount = callCount + 1; 39 }; 40 41 f().next().then(() => { 42 assert.sameValue(callCount, 1, 'invoked exactly once'); 43 }).then($DONE, $DONE);