tor-browser

The Tor Browser
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array-elision-iter-nrml-close-null.js (2196B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elision-iter-nrml-close-null.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: IteratorClose throws a TypeError when `return` returns a non-Object value (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 : [ Elision ]
     28 
     29    1. Let iterator be GetIterator(value).
     30    [...]
     31    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     32       result).
     33    [...]
     34 
     35    7.4.6 IteratorClose( iterator, completion )
     36 
     37    [...]
     38    6. Let innerResult be Call(return, iterator, « »).
     39    7. If completion.[[type]] is throw, return Completion(completion).
     40    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     41    9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
     42       exception.
     43 
     44 ---*/
     45 var iterable = {};
     46 var nextCount = 0;
     47 var iterator = {
     48  next: function() {
     49    nextCount += 1;
     50    // Set an upper-bound to limit unnecessary iteration in non-conformant
     51    // implementations
     52    return { done: nextCount > 10 };
     53  },
     54  return: function() {
     55    return null;
     56  }
     57 };
     58 iterable[Symbol.iterator] = function() {
     59  return iterator;
     60 };
     61 
     62 var counter = 0;
     63 
     64 assert.throws(TypeError, function() {
     65  for ([ , ] of [iterable]) {
     66    counter += 1;
     67  }
     68  counter += 1;
     69 });
     70 
     71 assert.sameValue(counter, 0);
     72 
     73 reportCompare(0, 0);