tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-params-arg-val-undefined.js (1810B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/function-forms/dflt-params-arg-val-undefined.case
      4 // - src/function-forms/default/async-arrow-function.template
      5 /*---
      6 description: Use of initializer when argument value is `undefined` (async arrow function expression)
      7 esid: sec-async-arrow-function-definitions
      8 features: [default-parameters, async-functions]
      9 flags: [generated, async]
     10 info: |
     11    14.7 Async Arrow Function Definitions
     12 
     13    AsyncArrowFunction :
     14      ...
     15      CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody
     16 
     17    AsyncConciseBody :
     18      { AsyncFunctionBody }
     19 
     20    ...
     21 
     22    Supplemental Syntax
     23 
     24    When processing an instance of the production AsyncArrowFunction :
     25    CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of
     26    CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:
     27 
     28    AsyncArrowHead :
     29      async ArrowFormalParameters
     30 
     31 
     32    14.1.19 Runtime Semantics: IteratorBindingInitialization
     33 
     34    FormalsList : FormalsList , FormalParameter
     35 
     36    [...]
     37    23. Let iteratorRecord be Record {[[Iterator]]:
     38        CreateListIterator(argumentsList), [[Done]]: false}.
     39    24. If hasDuplicates is true, then
     40        [...]
     41    25. Else,
     42        a. Perform ? IteratorBindingInitialization for formals with
     43           iteratorRecord and env as arguments.
     44    [...]
     45 
     46 ---*/
     47 
     48 
     49 var callCount = 0;
     50 
     51 // Stores a reference `ref` for case evaluation
     52 var ref = async (fromLiteral = 23, fromExpr = 45, fromHole = 99) => {
     53  assert.sameValue(fromLiteral, 23);
     54  assert.sameValue(fromExpr, 45);
     55  assert.sameValue(fromHole, 99);
     56  callCount = callCount + 1;
     57 };
     58 
     59 ref(undefined, void 0).then(() => {
     60  assert.sameValue(callCount, 1, 'async arrow function invoked exactly once')
     61 }).then($DONE, $DONE);