ary-ptrn-elem-id-iter-done.js (1883B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-id-iter-done.case 3 // - src/dstr-binding/default/gen-func-decl.template 4 /*--- 5 description: SingleNameBinding when value iteration was completed previously (generator function declaration) 6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject 7 features: [generators, destructuring-binding] 8 flags: [generated] 9 info: | 10 GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody } 11 12 [...] 13 2. Let F 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 41 42 SingleNameBinding : BindingIdentifier Initializeropt 43 44 [...] 45 4. If iteratorRecord.[[done]] is false, then 46 [...] 47 5. If iteratorRecord.[[done]] is true, let v be undefined. 48 [...] 49 8. Return InitializeReferencedBinding(lhs, v). 50 ---*/ 51 52 var callCount = 0; 53 function* f([_, x]) { 54 assert.sameValue(x, undefined); 55 callCount = callCount + 1; 56 }; 57 f([]).next(); 58 assert.sameValue(callCount, 1, 'generator function invoked exactly once'); 59 60 reportCompare(0, 0);