tor-browser

The Tor Browser
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array-rest-nested-array-iter-thrw-close-skip.js (2432B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-rest-nested-array-iter-thrw-close-skip.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: IteratorClose is not called when nested array pattern 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    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    7. Return the result of performing DestructuringAssignmentEvaluation of
     44       nestedAssignmentPattern with A as the argument.
     45 
     46 ---*/
     47 var nextCount = 0;
     48 var returnCount = 0;
     49 var iterable = {};
     50 var iterator = {
     51  next: function() {
     52    nextCount += 1;
     53    return { done: true };
     54  },
     55  return: function() {
     56    returnCount += 1;
     57  }
     58 };
     59 var thrower = function() {
     60  throw new Test262Error();
     61 };
     62 iterable[Symbol.iterator] = function() {
     63  return iterator;
     64 };
     65 
     66 var counter = 0;
     67 
     68 assert.throws(Test262Error, function() {
     69  for ([...[...{}[thrower()]]] of [iterable]) {
     70    counter += 1;
     71  }
     72  counter += 1;
     73 });
     74 
     75 assert.sameValue(counter, 0);
     76 
     77 assert.sameValue(nextCount, 1);
     78 assert.sameValue(returnCount, 0);
     79 
     80 reportCompare(0, 0);