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async-func-dstr-var-ary-ptrn-rest-ary-elision.js (2691B)

      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-var.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 ( var ForBinding of AssignmentExpression ) Statement
     13 
     14    [...]
     15    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
     16        varBinding, 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              1. Assert: lhs is a ForBinding.
     32              2. Let status be the result of performing BindingInitialization
     33                 for lhs passing nextValue and undefined as the arguments.
     34          [...]
     35 
     36    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     37 
     38    BindingRestElement : ... BindingPattern
     39 
     40    1. Let A be ArrayCreate(0).
     41    [...]
     42    3. Repeat
     43       [...]
     44       b. If iteratorRecord.[[done]] is true, then
     45          i. Return the result of performing BindingInitialization of
     46             BindingPattern with A and environment as the arguments.
     47       [...]
     48 
     49    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     50 
     51    ArrayBindingPattern : [ Elision ]
     52 
     53    1. Return the result of performing
     54       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     55       as the argument.
     56 
     57    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     58 
     59    Elision : ,
     60 
     61    1. If iteratorRecord.[[done]] is false, then
     62       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     63       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     64       c. ReturnIfAbrupt(next).
     65       d. If next is false, set iteratorRecord.[[done]] to true.
     66    2. Return NormalCompletion(empty).
     67 
     68 ---*/
     69 var first = 0;
     70 var second = 0;
     71 function* g() {
     72  first += 1;
     73  yield;
     74  second += 1;
     75 };
     76 
     77 var iterCount = 0;
     78 
     79 async function fn() {
     80  for await (var [...[,]] of [g()]) {
     81    assert.sameValue(first, 1);
     82    assert.sameValue(second, 1);
     83 
     84    iterCount += 1;
     85  }
     86 }
     87 
     88 fn()
     89  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
     90  .then($DONE, $DONE);