var-ary-init-iter-close.js (1838B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-init-iter-close.case 3 // - src/dstr-binding/default/for-var.template 4 /*--- 5 description: Iterator is closed when not exhausted by pattern evaluation (for statement) 6 esid: sec-for-statement-runtime-semantics-labelledevaluation 7 features: [Symbol.iterator, destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( var VariableDeclarationList ; Expressionopt ; Expressionopt ) Statement 12 13 1. Let varDcl be the result of evaluating VariableDeclarationList. 14 [...] 15 16 13.3.2.4 Runtime Semantics: Evaluation 17 18 VariableDeclarationList : VariableDeclarationList , VariableDeclaration 19 20 1. Let next be the result of evaluating VariableDeclarationList. 21 2. ReturnIfAbrupt(next). 22 3. Return the result of evaluating VariableDeclaration. 23 24 VariableDeclaration : BindingPattern Initializer 25 26 1. Let rhs be the result of evaluating Initializer. 27 2. Let rval be GetValue(rhs). 28 3. ReturnIfAbrupt(rval). 29 4. Return the result of performing BindingInitialization for BindingPattern 30 passing rval and undefined as arguments. 31 32 13.3.3.5 Runtime Semantics: BindingInitialization 33 34 BindingPattern : ArrayBindingPattern 35 36 [...] 37 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 38 result). 39 [...] 40 41 ---*/ 42 var doneCallCount = 0; 43 var iter = {}; 44 iter[Symbol.iterator] = function() { 45 return { 46 next: function() { 47 return { value: null, done: false }; 48 }, 49 return: function() { 50 doneCallCount += 1; 51 return {}; 52 } 53 }; 54 }; 55 56 var iterCount = 0; 57 58 for (var [x] = iter; iterCount < 1; ) { 59 assert.sameValue(doneCallCount, 1); 60 iterCount += 1; 61 } 62 63 assert.sameValue(iterCount, 1, 'Iteration occurred as expected'); 64 65 reportCompare(0, 0);