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array-elem-trlg-iter-rest-nrml-close-skip.js (2196B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-trlg-iter-rest-nrml-close-skip.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose is not called when rest element 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 :
     28        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
     29 
     30    [...]
     31    7. If AssignmentRestElement is present, then
     32       a. Let status be the result of performing
     33          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
     34          with iteratorRecord as the argument.
     35    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     36       status).
     37    9. Return Completion(status).
     38 
     39 ---*/
     40 var nextCount = 0;
     41 var returnCount = 0;
     42 var iterable = {};
     43 var x, y;
     44 var iterator = {
     45  next: function() {
     46    nextCount += 1;
     47    return { value: nextCount, done: nextCount > 1 };
     48  },
     49  return: function() {
     50    returnCount += 1;
     51  }
     52 };
     53 iterable[Symbol.iterator] = function() {
     54  return iterator;
     55 };
     56 
     57 var counter = 0;
     58 
     59 for ([ x , ...y ] of [iterable]) {
     60  
     61  counter += 1;
     62 }
     63 
     64 assert.sameValue(counter, 1);
     65 
     66 assert.sameValue(nextCount, 2, 'nextCount');
     67 assert.sameValue(returnCount, 0, 'returnCount');
     68 assert.sameValue(x, 1, 'x');
     69 assert.sameValue(y.length, 0, 'y.length');
     70 
     71 reportCompare(0, 0);