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async-gen-meth-dflt-ary-ptrn-rest-ary-elision.js (2458B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-binding/ary-ptrn-rest-ary-elision.case
      4 // - src/dstr-binding/default/async-gen-method-dflt.template
      5 /*---
      6 description: Rest element containing an elision (async generator method (default parameter))
      7 esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
      8 features: [generators, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    AsyncGeneratorMethod :
     12        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
     13            { AsyncGeneratorBody }
     14 
     15    1. Let propKey be the result of evaluating PropertyName.
     16    2. ReturnIfAbrupt(propKey).
     17    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
     18       Otherwise let strict be false.
     19    4. Let scope be the running execution context's LexicalEnvironment.
     20    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
     21       AsyncGeneratorBody, scope, strict).
     22    [...]
     23 
     24 
     25    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     26 
     27    BindingRestElement : ... BindingPattern
     28 
     29    1. Let A be ArrayCreate(0).
     30    [...]
     31    3. Repeat
     32       [...]
     33       b. If iteratorRecord.[[done]] is true, then
     34          i. Return the result of performing BindingInitialization of
     35             BindingPattern with A and environment as the arguments.
     36       [...]
     37 
     38    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     39 
     40    ArrayBindingPattern : [ Elision ]
     41 
     42    1. Return the result of performing
     43       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     44       as the argument.
     45 
     46    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     47 
     48    Elision : ,
     49 
     50    1. If iteratorRecord.[[done]] is false, then
     51       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     52       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     53       c. ReturnIfAbrupt(next).
     54       d. If next is false, set iteratorRecord.[[done]] to true.
     55    2. Return NormalCompletion(empty).
     56 
     57 ---*/
     58 var first = 0;
     59 var second = 0;
     60 function* g() {
     61  first += 1;
     62  yield;
     63  second += 1;
     64 };
     65 
     66 
     67 var callCount = 0;
     68 var obj = {
     69  async *method([...[,]] = g()) {
     70    assert.sameValue(first, 1);
     71    assert.sameValue(second, 1);
     72    callCount = callCount + 1;
     73  }
     74 };
     75 
     76 obj.method().next().then(() => {
     77    assert.sameValue(callCount, 1, 'invoked exactly once');
     78 }).then($DONE, $DONE);