[antlr-interest] v3.0 debug interface

[Andy Tripp]

Terence,

You may also want to add a method to let the debugger know when
the lexer has matched a Token:

  public void nextToken(Token token);

And maybe let the debugger know about the AST that's being created:

  public void rootCreated(AST root);
  public void childAdded(AST parent, AST child);

Andy