docs: def whowas(self, nick):
          """
          Runs a WHOWAS on someone.
          Required arguments:
          * nick - Nick to run a WHOWAS on.
          Returns a list:
             [0] The user's nick.
             [1] The user's ident.
             [2] The user's host.
             [3] The user's real name.
          """
          with self.lock:
              self.send('WHOWAS %s' % nick)
  
              rwhowas = []
              while self.readable():
                  msg = self._recv(expected_replies=('314', '312', '369'))
                  if msg[0] == '314':
                      raw_whowas = msg[2].split()
                      rwhowas = raw_whowas[0], raw_whowas[1], \
                          raw_whowas[2], raw_whowas[4][1:]
                  elif msg[0] == '312':
                      pass
                  elif msg[0] == '369':
                      return rwhowas