tor-browser

The Tor Browser
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array-rest-iter-nrml-close-skip.js (1944B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-rest-iter-nrml-close-skip.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose is not called when assignment evaluation has exhausted the iterator (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    7. Return result.
     36 
     37 ---*/
     38 var nextCount = 0;
     39 var returnCount = 0;
     40 var x;
     41 var iterable = {};
     42 var iterator = {
     43  next: function() {
     44    nextCount += 1;
     45    return { done: true };
     46  },
     47  return: function() {
     48    returnCount += 1;
     49  }
     50 };
     51 iterable[Symbol.iterator] = function() {
     52  return iterator;
     53 };
     54 
     55 var counter = 0;
     56 
     57 for ([ ...x ] of [iterable]) {
     58  assert.sameValue(nextCount, 1);
     59  assert.sameValue(returnCount, 0);
     60  counter += 1;
     61 }
     62 
     63 assert.sameValue(counter, 1);
     64 
     65 reportCompare(0, 0);