tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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let-ary-init-iter-no-close.js (1941B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-init-iter-no-close.case
      3 // - src/dstr-binding/default/for-of-let.template
      4 /*---
      5 description: Iterator is not closed when exhausted by pattern evaluation (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 ( ForDeclaration of AssignmentExpression ) Statement
     12 
     13    [...]
     14    3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     15       lexicalBinding, labelSet).
     16 
     17    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     18 
     19    [...]
     20    3. Let destructuring be IsDestructuring of lhs.
     21    [...]
     22    5. Repeat
     23       [...]
     24       h. If destructuring is false, then
     25          [...]
     26       i. Else
     27          i. If lhsKind is assignment, then
     28             [...]
     29          ii. Else if lhsKind is varBinding, then
     30              [...]
     31          iii. Else,
     32               1. Assert: lhsKind is lexicalBinding.
     33               2. Assert: lhs is a ForDeclaration.
     34               3. Let status be the result of performing BindingInitialization
     35                  for lhs passing nextValue and iterationEnv as arguments.
     36          [...]
     37 
     38    13.3.3.5 Runtime Semantics: BindingInitialization
     39 
     40    BindingPattern : ArrayBindingPattern
     41 
     42    [...]
     43    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
     44       result).
     45    [...]
     46 
     47 ---*/
     48 var doneCallCount = 0;
     49 var iter = {};
     50 iter[Symbol.iterator] = function() {
     51  return {
     52    next: function() {
     53      return { value: null, done: true };
     54    },
     55    return: function() {
     56      doneCallCount += 1;
     57      return {};
     58    }
     59  };
     60 };
     61 
     62 var iterCount = 0;
     63 
     64 for (let [x] of [iter]) {
     65  assert.sameValue(doneCallCount, 0);
     66 
     67  iterCount += 1;
     68 }
     69 
     70 assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
     71 
     72 reportCompare(0, 0);