tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-empty-iter-close-err.js (1803B)


      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-empty-iter-close-err.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: Abrupt completion returned from IteratorClose (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 
     29    1. Let iterator be GetIterator(value).
     30    2. ReturnIfAbrupt(iterator).
     31    3. Return IteratorClose(iterator, NormalCompletion(empty)).
     32 
     33 ---*/
     34 var nextCount = 0;
     35 var returnCount = 0;
     36 var iterable = {};
     37 var iterator = {
     38  next: function() {
     39    nextCount += 1;
     40    return { done: true };
     41  },
     42  return: function() {
     43    returnCount += 1;
     44    throw new Test262Error();
     45  }
     46 };
     47 iterable[Symbol.iterator] = function() {
     48  return iterator;
     49 };
     50 
     51 var counter = 0;
     52 
     53 assert.throws(Test262Error, function() {
     54  for ([] of [iterable]) {
     55    counter += 1;
     56  }
     57  counter += 1;
     58 });
     59 
     60 assert.sameValue(counter, 0);
     61 
     62 assert.sameValue(nextCount, 0);
     63 assert.sameValue(returnCount, 1);
     64 
     65 reportCompare(0, 0);