dflt-params-ref-self.js (1774B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/function-forms/dflt-params-ref-self.case 4 // - src/function-forms/error/async-arrow-function.template 5 /*--- 6 description: Referencing a parameter from within its own initializer (async arrow function expression) 7 esid: sec-async-arrow-function-definitions 8 features: [default-parameters, async-functions] 9 flags: [generated, async] 10 info: | 11 14.7 Async Arrow Function Definitions 12 13 AsyncArrowFunction : 14 ... 15 CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody 16 17 AsyncConciseBody : 18 { AsyncFunctionBody } 19 20 ... 21 22 Supplemental Syntax 23 24 When processing an instance of the production AsyncArrowFunction : 25 CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of 26 CoverCallExpressionAndAsyncArrowHead is refined using the following grammar: 27 28 AsyncArrowHead : 29 async ArrowFormalParameters 30 31 32 14.1.19 Runtime Semantics: IteratorBindingInitialization 33 34 FormalsList : FormalsList , FormalParameter 35 36 1. Let status be the result of performing IteratorBindingInitialization for 37 FormalsList using iteratorRecord and environment as the arguments. 38 2. ReturnIfAbrupt(status). 39 3. Return the result of performing IteratorBindingInitialization for 40 FormalParameter using iteratorRecord and environment as the arguments. 41 42 ---*/ 43 var x = 0; 44 45 46 var callCount = 0; 47 var f; 48 f = async (x = x) => { 49 50 callCount = callCount + 1; 51 }; 52 53 f() 54 .then(_ => { 55 throw new Test262Error('function should not be resolved'); 56 }, error => assert.sameValue(error.constructor, ReferenceError)) 57 .then(() => { 58 assert.sameValue(callCount, 0, 'function body is not evaluated'); 59 }, $DONE) 60 .then($DONE, $DONE);