tor-browser

The Tor Browser
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var-ary-ptrn-rest-ary-elision.js (2521B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-ary-elision.case
      3 // - src/dstr-binding/default/for-of-var.template
      4 /*---
      5 description: Rest element containing an elision (for-of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( var ForBinding of AssignmentExpression ) Statement
     12 
     13    [...]
     14    3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
     15       varBinding, 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              1. Assert: lhs is a ForBinding.
     31              2. Let status be the result of performing BindingInitialization
     32                 for lhs passing nextValue and undefined as the arguments.
     33          [...]
     34 
     35    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     36 
     37    BindingRestElement : ... BindingPattern
     38 
     39    1. Let A be ArrayCreate(0).
     40    [...]
     41    3. Repeat
     42       [...]
     43       b. If iteratorRecord.[[done]] is true, then
     44          i. Return the result of performing BindingInitialization of
     45             BindingPattern with A and environment as the arguments.
     46       [...]
     47 
     48    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     49 
     50    ArrayBindingPattern : [ Elision ]
     51 
     52    1. Return the result of performing
     53       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     54       as the argument.
     55 
     56    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     57 
     58    Elision : ,
     59 
     60    1. If iteratorRecord.[[done]] is false, then
     61       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     62       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     63       c. ReturnIfAbrupt(next).
     64       d. If next is false, set iteratorRecord.[[done]] to true.
     65    2. Return NormalCompletion(empty).
     66 
     67 ---*/
     68 var first = 0;
     69 var second = 0;
     70 function* g() {
     71  first += 1;
     72  yield;
     73  second += 1;
     74 };
     75 
     76 var iterCount = 0;
     77 
     78 for (var [...[,]] of [g()]) {
     79  assert.sameValue(first, 1);
     80  assert.sameValue(second, 1);
     81 
     82  iterCount += 1;
     83 }
     84 
     85 assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
     86 
     87 reportCompare(0, 0);