code: func (st *stateTracker) NickInfo(n, ident, host, name string) *Nick {
  	st.mu.Lock()
  	defer st.mu.Unlock()
  	nk, ok := st.nicks[n]
  	if !ok {
  		return nil
  	}
  	nk.ident = ident
  	nk.host = host
  	nk.name = name
  	return nk.Nick()
  }
docs: // Sets ident, host and "real" name for the nick.