# File lib/rbot/ircbot.rb, line 34
  def pretty_print(q)
    q.group(1, "#<%s: %s" % [self.class, self.message], ">") {
      if self.backtrace and not self.backtrace.empty?
        q.text "\n"
        q.seplist(self.backtrace, lambda { q.text "\n" } ) { |l| q.text l }
      end
    }
  end