array-elision-iter-nrml-close-err.js (1955B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-elision-iter-nrml-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 : [ Elision ] 28 29 1. Let iterator be GetIterator(value). 30 [...] 31 5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, 32 result). 33 6. Return result. 34 35 ---*/ 36 var nextCount = 0; 37 var returnCount = 0; 38 var iterable = {}; 39 var iterator = { 40 next: function() { 41 nextCount += 1; 42 // Set an upper-bound to limit unnecessary iteration in non-conformant 43 // implementations 44 return { done: nextCount > 10 }; 45 }, 46 return: function() { 47 returnCount += 1; 48 throw new Test262Error(); 49 } 50 }; 51 iterable[Symbol.iterator] = function() { 52 return iterator; 53 }; 54 55 var counter = 0; 56 57 assert.throws(Test262Error, function() { 58 for ([ , ] of [iterable]) { 59 counter += 1; 60 } 61 counter += 1; 62 }); 63 64 assert.sameValue(counter, 0); 65 66 assert.sameValue(nextCount, 1); 67 assert.sameValue(returnCount, 1); 68 69 reportCompare(0, 0);