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async-gen-meth-static-dflt-ary-ptrn-rest-ary-elision.js (3091B)

      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/cls-decl-async-gen-meth-static-dflt.template
      5 /*---
      6 description: Rest element containing an elision (static class expression async generator method (default parameter))
      7 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
      8 features: [generators, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    ClassDeclaration : class BindingIdentifier ClassTail
     12 
     13    1. Let className be StringValue of BindingIdentifier.
     14    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
     15       argument className.
     16    [...]
     17 
     18    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
     19 
     20    21. For each ClassElement m in order from methods
     21        a. If IsStatic of m is false, then
     22        b. Else,
     23           Let status be the result of performing PropertyDefinitionEvaluation for
     24           m with arguments F and false.
     25    [...]
     26 
     27    Runtime Semantics: PropertyDefinitionEvaluation
     28 
     29    AsyncGeneratorMethod :
     30        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
     31            { AsyncGeneratorBody }
     32 
     33    1. Let propKey be the result of evaluating PropertyName.
     34    2. ReturnIfAbrupt(propKey).
     35    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
     36       Otherwise let strict be false.
     37    4. Let scope be the running execution context's LexicalEnvironment.
     38    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
     39       AsyncGeneratorBody, scope, strict).
     40    [...]
     41 
     42 
     43    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     44 
     45    BindingRestElement : ... BindingPattern
     46 
     47    1. Let A be ArrayCreate(0).
     48    [...]
     49    3. Repeat
     50       [...]
     51       b. If iteratorRecord.[[done]] is true, then
     52          i. Return the result of performing BindingInitialization of
     53             BindingPattern with A and environment as the arguments.
     54       [...]
     55 
     56    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     57 
     58    ArrayBindingPattern : [ Elision ]
     59 
     60    1. Return the result of performing
     61       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     62       as the argument.
     63 
     64    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     65 
     66    Elision : ,
     67 
     68    1. If iteratorRecord.[[done]] is false, then
     69       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     70       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     71       c. ReturnIfAbrupt(next).
     72       d. If next is false, set iteratorRecord.[[done]] to true.
     73    2. Return NormalCompletion(empty).
     74 
     75 ---*/
     76 var first = 0;
     77 var second = 0;
     78 function* g() {
     79  first += 1;
     80  yield;
     81  second += 1;
     82 };
     83 
     84 
     85 var callCount = 0;
     86 class C {
     87  static async *method([...[,]] = g()) {
     88    assert.sameValue(first, 1);
     89    assert.sameValue(second, 1);
     90    callCount = callCount + 1;
     91  }
     92 };
     93 
     94 C.method().next().then(() => {
     95    assert.sameValue(callCount, 1, 'invoked exactly once');    
     96 }).then($DONE, $DONE);