var-ary-init-iter-close.js (1831B)
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-of-var.template 4 /*--- 5 description: Iterator is closed when not exhausted by pattern evaluation (for-of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [Symbol.iterator, destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( var ForBinding of AssignmentExpression ) Statement 12 13 [...] 14 3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 15 varBinding, labelSet). 16 17 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 18 19 [...] 20 3. Let destructuring be IsDestructuring of lhs. 21 [...] 22 5. Repeat 23 [...] 24 h. If destructuring is false, then 25 [...] 26 i. Else 27 i. If lhsKind is assignment, then 28 [...] 29 ii. Else if lhsKind is varBinding, then 30 1. Assert: lhs is a ForBinding. 31 2. Let status be the result of performing BindingInitialization 32 for lhs passing nextValue and undefined as the arguments. 33 [...] 34 35 13.3.3.5 Runtime Semantics: BindingInitialization 36 37 BindingPattern : ArrayBindingPattern 38 39 [...] 40 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 41 result). 42 [...] 43 44 ---*/ 45 var doneCallCount = 0; 46 var iter = {}; 47 iter[Symbol.iterator] = function() { 48 return { 49 next: function() { 50 return { value: null, done: false }; 51 }, 52 return: function() { 53 doneCallCount += 1; 54 return {}; 55 } 56 }; 57 }; 58 59 var iterCount = 0; 60 61 for (var [x] of [iter]) { 62 assert.sameValue(doneCallCount, 1); 63 64 iterCount += 1; 65 } 66 67 assert.sameValue(iterCount, 1, 'Iteration occurred as expected'); 68 69 reportCompare(0, 0);