dflt-params-trailing-comma.js (1870B)
1 // This file was procedurally generated from the following sources: 2 // - src/function-forms/dflt-params-trailing-comma.case 3 // - src/function-forms/default/gen-func-expr.template 4 /*--- 5 description: A trailing comma should not increase the respective length, using default parameters (generator function expression) 6 esid: sec-generator-function-definitions-runtime-semantics-evaluation 7 features: [generators] 8 flags: [generated] 9 info: | 10 GeneratorExpression : function * ( FormalParameters ) { GeneratorBody } 11 12 [...] 13 3. Let closure be GeneratorFunctionCreate(Normal, FormalParameters, 14 GeneratorBody, scope, strict). 15 [...] 16 17 9.2.1 [[Call]] ( thisArgument, argumentsList) 18 19 [...] 20 7. Let result be OrdinaryCallEvaluateBody(F, argumentsList). 21 [...] 22 23 9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList ) 24 25 1. Let status be FunctionDeclarationInstantiation(F, argumentsList). 26 [...] 27 28 9.2.12 FunctionDeclarationInstantiation(func, argumentsList) 29 30 [...] 31 23. Let iteratorRecord be Record {[[iterator]]: 32 CreateListIterator(argumentsList), [[done]]: false}. 33 24. If hasDuplicates is true, then 34 [...] 35 25. Else, 36 b. Let formalStatus be IteratorBindingInitialization for formals with 37 iteratorRecord and env as arguments. 38 [...] 39 40 41 Trailing comma in the parameters list 42 43 14.1 Function Definitions 44 45 FormalParameters[Yield, Await] : FormalParameterList[?Yield, ?Await] , 46 ---*/ 47 48 var callCount = 0; 49 // Stores a reference `ref` for case evaluation 50 var ref; 51 ref = function*(a, b = 39,) { 52 assert.sameValue(a, 42); 53 assert.sameValue(b, 39); 54 callCount = callCount + 1; 55 }; 56 57 ref(42, undefined, 1).next(); 58 59 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 60 61 assert.sameValue(ref.length, 1, 'length is properly set'); 62 63 reportCompare(0, 0);