async-gen-meth-dflt-ary-ptrn-elision-exhausted.js (1739B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elision-exhausted.case 4 // - src/dstr-binding/default/async-gen-method-dflt.template 5 /*--- 6 description: Elision accepts exhausted iterator (async generator method (default parameter)) 7 esid: sec-asyncgenerator-definitions-propertydefinitionevaluation 8 features: [generators, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorMethod : 12 async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) 13 { AsyncGeneratorBody } 14 15 1. Let propKey be the result of evaluating PropertyName. 16 2. ReturnIfAbrupt(propKey). 17 3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true. 18 Otherwise let strict be false. 19 4. Let scope be the running execution context's LexicalEnvironment. 20 5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters, 21 AsyncGeneratorBody, scope, strict). 22 [...] 23 24 25 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 26 27 ArrayBindingPattern : [ Elision ] 28 29 1. Return the result of performing 30 IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord 31 as the argument. 32 33 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation 34 35 Elision : , 36 37 1. If iteratorRecord.[[done]] is false, then 38 [...] 39 2. Return NormalCompletion(empty). 40 41 ---*/ 42 var iter = function*() {}(); 43 iter.next(); 44 45 46 var callCount = 0; 47 var obj = { 48 async *method([,] = iter) { 49 50 callCount = callCount + 1; 51 } 52 }; 53 54 obj.method().next().then(() => { 55 assert.sameValue(callCount, 1, 'invoked exactly once'); 56 }).then($DONE, $DONE);