dflt-params-arg-val-undefined.js (1601B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/function-forms/dflt-params-arg-val-undefined.case 4 // - src/function-forms/default/async-gen-func-expr.template 5 /*--- 6 description: Use of initializer when argument value is `undefined` (async generator function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [default-parameters, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) { 12 AsyncGeneratorBody } 13 14 [...] 15 3. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, scope, strict). 17 [...] 18 19 20 14.1.19 Runtime Semantics: IteratorBindingInitialization 21 22 FormalsList : FormalsList , FormalParameter 23 24 [...] 25 23. Let iteratorRecord be Record {[[Iterator]]: 26 CreateListIterator(argumentsList), [[Done]]: false}. 27 24. If hasDuplicates is true, then 28 [...] 29 25. Else, 30 a. Perform ? IteratorBindingInitialization for formals with 31 iteratorRecord and env as arguments. 32 [...] 33 34 ---*/ 35 36 37 var callCount = 0; 38 // Stores a reference `ref` for case evaluation 39 var ref; 40 ref = async function*(fromLiteral = 23, fromExpr = 45, fromHole = 99) { 41 assert.sameValue(fromLiteral, 23); 42 assert.sameValue(fromExpr, 45); 43 assert.sameValue(fromHole, 99); 44 callCount = callCount + 1; 45 }; 46 47 ref(undefined, void 0).next().then(() => { 48 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 49 }).then($DONE, $DONE);