array-elem-iter-nrml-close-skip.js (1775B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-elem-iter-nrml-close-skip.case 3 // - src/dstr-assignment/default/for-of.template 4 /*--- 5 description: IteratorClose is not called when assignment evaluation has exhausted the iterator (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 ( LeftHandSideExpression of AssignmentExpression ) Statement 12 13 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », 14 AssignmentExpression, iterate). 15 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, 16 keyResult, assignment, labelSet). 17 18 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 19 20 [...] 21 4. If destructuring is true and if lhsKind is assignment, then 22 a. Assert: lhs is a LeftHandSideExpression. 23 b. Let assignmentPattern be the parse of the source text corresponding to 24 lhs using AssignmentPattern as the goal symbol. 25 [...] 26 27 ArrayAssignmentPattern : [ AssignmentElementList ] 28 29 [...] 30 5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, result). 31 6. Return result. 32 33 ---*/ 34 var nextCount = 0; 35 var returnCount = 0; 36 var _; 37 var iterable = {}; 38 var iterator = { 39 next: function() { 40 nextCount += 1; 41 return { done: true }; 42 }, 43 return: function() { 44 returnCount += 1; 45 return {}; 46 } 47 }; 48 iterable[Symbol.iterator] = function() { 49 return iterator; 50 }; 51 52 var counter = 0; 53 54 for ([ _ ] of [iterable]) { 55 assert.sameValue(nextCount, 1); 56 assert.sameValue(returnCount, 0); 57 counter += 1; 58 } 59 60 assert.sameValue(counter, 1); 61 62 reportCompare(0, 0);