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array-rest-put-prop-ref-user-err-iter-close-skip.js (2473B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-rest-put-prop-ref-user-err-iter-close-skip.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: IteratorClose is not called when value assignment 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    5. Let result be the result of performing
     31       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
     32       iteratorRecord as the argument
     33    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     34       result).
     35 
     36    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
     37 
     38    [...]
     39    4. Repeat while iteratorRecord.[[done]] is false
     40       [...]
     41       d. If next is false, set iteratorRecord.[[done]] to true.
     42       [...]
     43    5. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
     44       ArrayLiteral, then
     45       a. Return PutValue(lref, A).
     46 
     47 ---*/
     48 var nextCount = 0;
     49 var returnCount = 0;
     50 var iterable = {};
     51 var iterator = {
     52  next: function() {
     53    nextCount += 1;
     54    return { done: true };
     55  },
     56  return: function() {
     57    returnCount += 1;
     58  }
     59 };
     60 var obj = Object.defineProperty({}, 'poisoned', {
     61  set: function(x) {
     62    throw new Test262Error();
     63  }
     64 });
     65 iterable[Symbol.iterator] = function() {
     66  return iterator;
     67 };
     68 
     69 var counter = 0;
     70 
     71 assert.throws(Test262Error, function() {
     72  for ([...obj.poisoned] of [iterable]) {
     73    counter += 1;
     74  }
     75  counter += 1;
     76 });
     77 
     78 assert.sameValue(counter, 0);
     79 
     80 assert.sameValue(nextCount, 1);
     81 assert.sameValue(returnCount, 0);
     82 
     83 reportCompare(0, 0);