// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

/// @assertion Optional parameters may be specified and provided with default
/// values.
/// defaultFormalParameter:
///   normalFormalParameter ('=' expression)?
/// ;
/// defaultNamedParameter:
///   normalFormalParameter (':' expression)?
/// ;
/// @description Checks that it is not a compile-time error if the name of a
/// positional optional parameter begins with an '_' character.
/// @author msyabro
/// @reviewer kaigorodov
/// @reviewer iefremov
/// @reviewer rodionov
/// @note renamed from 2_Optional_Formals_A03_t01


main() {
  void func([var _x]) {}
  func(1);
}