mirror of https://github.com/tc39/test262.git
61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/function-forms/dflt-params-arg-val-undefined.case
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// - src/function-forms/default/async-arrow-function.template
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/*---
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description: Use of initializer when argument value is `undefined` (async arrow function expression)
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esid: sec-async-arrow-function-definitions
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features: [default-parameters, async-functions]
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flags: [generated, async]
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info: |
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14.7 Async Arrow Function Definitions
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AsyncArrowFunction :
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...
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CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody
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AsyncConciseBody :
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{ AsyncFunctionBody }
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...
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Supplemental Syntax
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When processing an instance of the production AsyncArrowFunction :
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CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of
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CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:
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AsyncArrowHead :
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async ArrowFormalParameters
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14.1.19 Runtime Semantics: IteratorBindingInitialization
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FormalsList : FormalsList , FormalParameter
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[...]
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23. Let iteratorRecord be Record {[[Iterator]]:
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CreateListIterator(argumentsList), [[Done]]: false}.
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24. If hasDuplicates is true, then
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[...]
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25. Else,
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a. Perform ? IteratorBindingInitialization for formals with
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iteratorRecord and env as arguments.
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[...]
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---*/
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var callCount = 0;
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// Stores a reference `ref` for case evaluation
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var ref = async (fromLiteral = 23, fromExpr = 45, fromHole = 99) => {
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assert.sameValue(fromLiteral, 23);
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assert.sameValue(fromExpr, 45);
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assert.sameValue(fromHole, 99);
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callCount = callCount + 1;
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};
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ref(undefined, void 0).then(() => {
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assert.sameValue(callCount, 1, 'async arrow function invoked exactly once')
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}).then($DONE, $DONE);
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