| // This file was procedurally generated from the following sources: |
| // - src/dstr-assignment/array-elem-trlg-iter-rest-nrml-close-skip.case |
| // - src/dstr-assignment/default/for-of.template |
| /*--- |
| description: IteratorClose is not called when rest element evaluation has exhausted the iterator (For..of statement) |
| esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation |
| es6id: 13.7.5.11 |
| features: [Symbol.iterator, destructuring-binding] |
| flags: [generated] |
| info: | |
| IterationStatement : |
| for ( LeftHandSideExpression of AssignmentExpression ) Statement |
| |
| 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », |
| AssignmentExpression, iterate). |
| 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, |
| keyResult, assignment, labelSet). |
| |
| 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation |
| |
| [...] |
| 4. If destructuring is true and if lhsKind is assignment, then |
| a. Assert: lhs is a LeftHandSideExpression. |
| b. Let assignmentPattern be the parse of the source text corresponding to |
| lhs using AssignmentPattern as the goal symbol. |
| [...] |
| |
| ArrayAssignmentPattern : |
| [ AssignmentElementList , Elisionopt AssignmentRestElementopt ] |
| |
| [...] |
| 7. If AssignmentRestElement is present, then |
| a. Let status be the result of performing |
| IteratorDestructuringAssignmentEvaluation of AssignmentRestElement |
| with iteratorRecord as the argument. |
| 8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, |
| status). |
| 9. Return Completion(status). |
| |
| ---*/ |
| var nextCount = 0; |
| var returnCount = 0; |
| var iterable = {}; |
| var x, y; |
| var iterator = { |
| next: function() { |
| nextCount += 1; |
| return { value: nextCount, done: nextCount > 1 }; |
| }, |
| return: function() { |
| returnCount += 1; |
| } |
| }; |
| iterable[Symbol.iterator] = function() { |
| return iterator; |
| }; |
| |
| var counter = 0; |
| |
| for ([ x , ...y ] of [iterable]) { |
| |
| counter += 1; |
| } |
| |
| assert.sameValue(counter, 1); |
| |
| assert.sameValue(nextCount, 2, 'nextCount'); |
| assert.sameValue(returnCount, 0, 'returnCount'); |
| assert.sameValue(x, 1, 'x'); |
| assert.sameValue(y.length, 0, 'y.length'); |