tor-browser

The Tor Browser
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array-elem-trlg-iter-rest-thrw-close-skip.js (2280B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-trlg-iter-rest-thrw-close-skip.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: Abrupt completion returned during iteration for rest element (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;
     44 var iterator = {
     45  next: function() {
     46    nextCount += 1;
     47 
     48    if (nextCount === 2) {
     49      throw new Test262Error();
     50    }
     51 
     52    // Set an upper-bound to limit unnecessary iteration in non-conformant
     53    // implementations
     54    return { done: nextCount > 10 };
     55  },
     56  return: function() {
     57    returnCount += 1;
     58  }
     59 };
     60 iterable[Symbol.iterator] = function() {
     61  return iterator;
     62 };
     63 
     64 var counter = 0;
     65 
     66 assert.throws(Test262Error, function() {
     67  for ([ x , ...x ] of [iterable]) {
     68    counter += 1;
     69  }
     70  counter += 1;
     71 });
     72 
     73 assert.sameValue(counter, 0);
     74 
     75 assert.sameValue(nextCount, 2);
     76 assert.sameValue(returnCount, 0);
     77 
     78 reportCompare(0, 0);