src/arguments/default/async-gen-func-decl.template

// Copyright (C) 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
path: language/arguments-object/cls-decl-async-gen-func-
name: async generator function declaration
esid: sec-asyncgenerator-definitions-instantiatefunctionobject
info: |
    AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
        ( FormalParameters ) { AsyncGeneratorBody }

        [...]
        3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
            scope, strict).
        [...]
flags: [async]
features: [async-iteration]
---*/

var callCount = 0;
// Stores a reference `ref` for case evaluation
async function* ref() {
  /*{ body }*/
  callCount = callCount + 1;
}

ref(/*{ args }*/).next().then(() => {
    assert.sameValue(callCount, 1, 'generator function invoked exactly once');
}).then($DONE, $DONE);