tor-browser

The Tor Browser
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let-ary-ptrn-rest-ary-elision.js (2629B)

      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-let.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 ( 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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     39 
     40    BindingRestElement : ... BindingPattern
     41 
     42    1. Let A be ArrayCreate(0).
     43    [...]
     44    3. Repeat
     45       [...]
     46       b. If iteratorRecord.[[done]] is true, then
     47          i. Return the result of performing BindingInitialization of
     48             BindingPattern with A and environment as the arguments.
     49       [...]
     50 
     51    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     52 
     53    ArrayBindingPattern : [ Elision ]
     54 
     55    1. Return the result of performing
     56       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     57       as the argument.
     58 
     59    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     60 
     61    Elision : ,
     62 
     63    1. If iteratorRecord.[[done]] is false, then
     64       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     65       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     66       c. ReturnIfAbrupt(next).
     67       d. If next is false, set iteratorRecord.[[done]] to true.
     68    2. Return NormalCompletion(empty).
     69 
     70 ---*/
     71 var first = 0;
     72 var second = 0;
     73 function* g() {
     74  first += 1;
     75  yield;
     76  second += 1;
     77 };
     78 
     79 var iterCount = 0;
     80 
     81 for (let [...[,]] of [g()]) {
     82  assert.sameValue(first, 1);
     83  assert.sameValue(second, 1);
     84 
     85  iterCount += 1;
     86 }
     87 
     88 assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
     89 
     90 reportCompare(0, 0);