anchor.diff:  
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   
  -%% Basically establish a TCP connection via an async connect. 
  +%% Basically establish a TCP connection via an async connect. IPv4.
   
   api_a_connect_tcp4(suite) ->
       [];
  
positive.code: 
           %% *** API async ***
           api_a_connect_tcp4/1,
           api_a_sendto_and_recvfrom_udp4/1,
           api_a_sendmsg_and_recvmsg_udp4/1,
           api_a_send_and_recv_tcp4/1,
  
negative.code: api_async_cases() ->
      [
       api_a_connect_tcp4,
       api_a_connect_tcp6,
       api_a_sendto_and_recvfrom_udp4,
       api_a_sendmsg_and_recvmsg_udp4,
       api_a_send_and_recv_tcp4,
  