code: protected void throwMessage(int number, String message, int depth)
  			throws ParserException, LexException
  	{
  		throw new ParserException(number, message, lastToken().location, depth);
  	}
docs: Raise a {@link ParserException} with a given token depth.
  @param number The error number.
  @param message The error message.
  @param depth The depth of the exception (tokens read).
  
  @throws ParserException