code: func (conn *Conn) EnableStateTracking() {
  	conn.mu.Lock()
  	defer conn.mu.Unlock()
  	if conn.st == nil {
  		n := conn.cfg.Me
  		conn.st = state.NewTracker(n.Nick)
  		conn.st.NickInfo(n.Nick, n.Ident, n.Host, n.Name)
  		conn.cfg.Me = conn.st.Me()
  		conn.addSTHandlers()
  	}
  }
docs: // EnableStateTracking causes the client to track information about
  // all channels it is joined to, and all the nicks in those channels.
  // This can be rather handy for a number of bot-writing tasks. See
  // the state package for more details.
  //
  // NOTE: Calling this while connected to an IRC server may cause the
  // state tracker to become very confused all over STDERR if logging
  // is enabled. State tracking should enabled before connecting or
  // at a pinch while the client is not joined to any channels.