anchor.diff:           api_a_recv_cancel_tcp4/1,
            api_a_recvmsg_cancel_tcp4/1,
            api_a_mrecvfrom_cancel_udp4/1,
  +         api_a_mrecvmsg_cancel_udp4/1,
   
   
            %% *** API Options ***
  
positive.code:            fun() ->
                     Recv = fun(Sock) ->
                                    case socket:recvfrom(Sock, 0, nowait) of
                                        {ok, _} = OK ->
                                            OK;
                                        {error, _} = ERROR ->
  
negative.code:      api_a_accept_cancel_tcp4,
       api_a_recv_cancel_tcp4,
       api_a_recvmsg_cancel_tcp4,
       api_a_mrecvfrom_cancel_udp4,
       api_a_mrecvmsg_cancel_udp4
      ].
  
  api_options_cases() ->
  