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async-gen-meth-static-dflt-ary-ptrn-rest-ary-elision.js (3175B)

      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-expr-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-class-definitions-runtime-semantics-evaluation
      8 features: [generators, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    ClassExpression : class BindingIdentifieropt ClassTail
     12 
     13    1. If BindingIdentifieropt is not present, let className be undefined.
     14    2. Else, let className be StringValue of BindingIdentifier.
     15    3. Let value be the result of ClassDefinitionEvaluation of ClassTail
     16       with argument className.
     17    [...]
     18 
     19    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
     20 
     21    21. For each ClassElement m in order from methods
     22        a. If IsStatic of m is false, then
     23        b. Else,
     24           Let status be the result of performing PropertyDefinitionEvaluation
     25           for m with arguments F and false.
     26    [...]
     27 
     28    Runtime Semantics: PropertyDefinitionEvaluation
     29 
     30    AsyncGeneratorMethod :
     31        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
     32            { AsyncGeneratorBody }
     33 
     34    1. Let propKey be the result of evaluating PropertyName.
     35    2. ReturnIfAbrupt(propKey).
     36    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
     37       Otherwise let strict be false.
     38    4. Let scope be the running execution context's LexicalEnvironment.
     39    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
     40       AsyncGeneratorBody, scope, strict).
     41    [...]
     42 
     43 
     44    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     45 
     46    BindingRestElement : ... BindingPattern
     47 
     48    1. Let A be ArrayCreate(0).
     49    [...]
     50    3. Repeat
     51       [...]
     52       b. If iteratorRecord.[[done]] is true, then
     53          i. Return the result of performing BindingInitialization of
     54             BindingPattern with A and environment as the arguments.
     55       [...]
     56 
     57    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     58 
     59    ArrayBindingPattern : [ Elision ]
     60 
     61    1. Return the result of performing
     62       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     63       as the argument.
     64 
     65    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     66 
     67    Elision : ,
     68 
     69    1. If iteratorRecord.[[done]] is false, then
     70       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     71       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     72       c. ReturnIfAbrupt(next).
     73       d. If next is false, set iteratorRecord.[[done]] to true.
     74    2. Return NormalCompletion(empty).
     75 
     76 ---*/
     77 var first = 0;
     78 var second = 0;
     79 function* g() {
     80  first += 1;
     81  yield;
     82  second += 1;
     83 };
     84 
     85 
     86 var callCount = 0;
     87 var C = class {
     88  static async *method([...[,]] = g()) {
     89    assert.sameValue(first, 1);
     90    assert.sameValue(second, 1);
     91    callCount = callCount + 1;
     92  }
     93 };
     94 
     95 C.method().next().then(() => {
     96    assert.sameValue(callCount, 1, 'invoked exactly once');    
     97 }).then($DONE, $DONE);