text: 
  /* Compiler implementation of the D programming language
   * Copyright (C) 1999-2021 by The D Language Foundation, All Rights Reserved
   * written by Walter Bright
   * https://www.digitalmars.com
   * Distributed under the Boost Software License, Version 1.0.
   * https://www.boost.org/LICENSE_1_0.txt
   * https://github.com/dlang/dmd/blob/master/src/dmd/ast_node.h
   */
  
  #pragma once
  
  #include "root/object.h"
  
  class Visitor;
  
  class ASTNode : public RootObject
  {
      virtual void accept(Visitor*) = 0;
  };
  