array-empty-iter-close-err.js (1803B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-empty-iter-close-err.case 3 // - src/dstr-assignment/error/for-of.template 4 /*--- 5 description: Abrupt completion returned from IteratorClose (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 : [ ] 28 29 1. Let iterator be GetIterator(value). 30 2. ReturnIfAbrupt(iterator). 31 3. Return IteratorClose(iterator, NormalCompletion(empty)). 32 33 ---*/ 34 var nextCount = 0; 35 var returnCount = 0; 36 var iterable = {}; 37 var iterator = { 38 next: function() { 39 nextCount += 1; 40 return { done: true }; 41 }, 42 return: function() { 43 returnCount += 1; 44 throw new Test262Error(); 45 } 46 }; 47 iterable[Symbol.iterator] = function() { 48 return iterator; 49 }; 50 51 var counter = 0; 52 53 assert.throws(Test262Error, function() { 54 for ([] of [iterable]) { 55 counter += 1; 56 } 57 counter += 1; 58 }); 59 60 assert.sameValue(counter, 0); 61 62 assert.sameValue(nextCount, 0); 63 assert.sameValue(returnCount, 1); 64 65 reportCompare(0, 0);