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// Copyright (C) 2017 Leo Balter. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
path: language/expressions/async-arrow-function/
name: async arrow function expression
esid: sec-async-arrow-function-definitions
info: |
14.7 Async Arrow Function Definitions
AsyncArrowFunction :
...
CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody
AsyncConciseBody :
{ AsyncFunctionBody }
...
Supplemental Syntax
When processing an instance of the production AsyncArrowFunction :
CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of
CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:
AsyncArrowHead :
async ArrowFormalParameters
flags: [async]
---*/
var callCount = 0;
// Stores a reference `ref` for case evaluation
var ref = async (/*{ params }*/) => {
/*{ body }*/
callCount = callCount + 1;
};
ref(/*{ args }*/).then(() => {
assert.sameValue(callCount, 1, 'async arrow function invoked exactly once')
}).then($DONE, $DONE);
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