array-rest-elision-iter-abpt.js (2122B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-rest-elision-iter-abpt.case 3 // - src/dstr-assignment/error/for-of.template 4 /*--- 5 description: IteratorClose is not called when assignment evaluation produces an abrupt completion (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 : [ Elisionopt AssignmentRestElement ] 28 29 [...] 30 4. If Elision is present, then 31 a. Let status be the result of performing 32 IteratorDestructuringAssignmentEvaluation of Elision with 33 iteratorRecord as the argument. 34 b. If status is an abrupt completion, then 35 i. If iteratorRecord.[[done]] is false, return 36 IteratorClose(iterator, status). 37 ii. Return Completion(status). 38 39 ---*/ 40 var nextCount = 0; 41 var returnCount = 0; 42 var iterable = {}; 43 var iterator = { 44 next: function() { 45 nextCount += 1; 46 throw new Test262Error(); 47 }, 48 return: function() { 49 returnCount += 1; 50 } 51 }; 52 iterable[Symbol.iterator] = function() { 53 return iterator; 54 }; 55 var x; 56 57 var counter = 0; 58 59 assert.throws(Test262Error, function() { 60 for ([ , ...x] of [iterable]) { 61 counter += 1; 62 } 63 counter += 1; 64 }); 65 66 assert.sameValue(counter, 0); 67 68 assert.sameValue(nextCount, 1); 69 assert.sameValue(returnCount, 0); 70 71 reportCompare(0, 0);