tor-browser

The Tor Browser
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async-func-dstr-const-async-ary-ptrn-rest-ary-elision.js (2871B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-binding-for-await/ary-ptrn-rest-ary-elision.case
      4 // - src/dstr-binding-for-await/default/for-await-of-async-func-const-async.template
      5 /*---
      6 description: Rest element containing an elision (for-await-of statement)
      7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      8 features: [generators, destructuring-binding, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    IterationStatement :
     12        for await ( ForDeclaration of AssignmentExpression ) Statement
     13 
     14    [...]
     15    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     16        lexicalBinding, labelSet, async).
     17 
     18    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     19 
     20    [...]
     21    4. Let destructuring be IsDestructuring of lhs.
     22    [...]
     23    6. Repeat
     24       [...]
     25       j. If destructuring is false, then
     26          [...]
     27       k. Else
     28          i. If lhsKind is assignment, then
     29             [...]
     30          ii. Else if lhsKind is varBinding, then
     31              [...]
     32          iii. Else,
     33               1. Assert: lhsKind is lexicalBinding.
     34               2. Assert: lhs is a ForDeclaration.
     35               3. Let status be the result of performing BindingInitialization
     36                  for lhs passing nextValue and iterationEnv as arguments.
     37          [...]
     38 
     39    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     40 
     41    BindingRestElement : ... BindingPattern
     42 
     43    1. Let A be ArrayCreate(0).
     44    [...]
     45    3. Repeat
     46       [...]
     47       b. If iteratorRecord.[[done]] is true, then
     48          i. Return the result of performing BindingInitialization of
     49             BindingPattern with A and environment as the arguments.
     50       [...]
     51 
     52    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     53 
     54    ArrayBindingPattern : [ Elision ]
     55 
     56    1. Return the result of performing
     57       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     58       as the argument.
     59 
     60    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     61 
     62    Elision : ,
     63 
     64    1. If iteratorRecord.[[done]] is false, then
     65       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     66       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     67       c. ReturnIfAbrupt(next).
     68       d. If next is false, set iteratorRecord.[[done]] to true.
     69    2. Return NormalCompletion(empty).
     70 
     71 ---*/
     72 var first = 0;
     73 var second = 0;
     74 function* g() {
     75  first += 1;
     76  yield;
     77  second += 1;
     78 };
     79 
     80 var iterCount = 0;
     81 var asyncIter = (async function*() {
     82  yield* [g()];
     83 })();
     84 
     85 async function fn() {
     86  for await (const [...[,]] of asyncIter) {
     87    assert.sameValue(first, 1);
     88    assert.sameValue(second, 1);
     89 
     90    iterCount += 1;
     91  }
     92 }
     93 
     94 fn()
     95  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
     96  .then($DONE, $DONE);