text: /***
   * Excerpted from "Language Implementation Patterns",
   * published by The Pragmatic Bookshelf.
   * Copyrights apply to this code. It may not be used to create training material, 
   * courses, books, articles, and the like. Contact us if you are in doubt.
   * We make no guarantees that this code is fit for any purpose. 
   * Visit http://www.pragmaticprogrammer.com/titles/tpdsl for more book information.
  ***/
  import org.antlr.runtime.tree.CommonTree;
  import org.antlr.runtime.Token;
  public class JnuAST extends CommonTree {
      public Scope scope;   // set by Def.g; ID lives in which scope?
      public Symbol symbol; // set by Ref.g; point at def in symbol table 
      public JnuAST(Token t) { super(t); }
  }
  