anchor.diff:  
       (fun () ->
           {ok, RB} = cmd(delete, Sock, nil,
  -                       #mc_msg{key= <<"aaa">>}),
  +                       #mc_msg{key = <<"aaa">>}),
           ?assertMatch(RB, <<"DELETED">>),
   
           {ok, RB1} = send_recv(Sock, "get aaa\r\n", nil),
  
positive.code: get_recv(Sock, RecvCallback) ->
      Line = recv_line(Sock),
      case Line of
          {error, _}=Err -> Err;
          {ok, <<"END">>} -> Line;
          {ok, <<"VALUE ", Rest/binary>>} ->
              Parse = io_lib:fread("~s ~u ~u", binary_to_list(Rest)),
  
negative.code: cmd_binary(?GETK, _Sock, _RecvCallback, _Msg) ->
      exit(todo);
  
  cmd_binary(?GETKQ, Sock, RecvCallback, #mc_msg{keys = Keys}) ->
      cmd(get, Sock, RecvCallback, #mc_msg{keys = Keys});
  
  cmd_binary(?APPEND, _Sock, _RecvCallback, _Msg) ->
      exit(todo);
  