anchor.diff:  api_b_open_and_close_udp4(doc) ->
       [];
   api_b_open_and_close_udp4(_Config) when is_list(_Config) ->
  -    tc_begin(api_b_open_and_close_udp4),
  -    State = #{domain   => inet,
  -              type     => dgram,
  -              protocol => udp},
  -    ok = api_b_open_and_close(State),
  -    tc_end().
  +    tc_try(api_b_open_and_close_udp4,
  +           fun() ->
  +                   InitState = #{domain   => inet,
  +                                 type     => dgram,
  +                                 protocol => udp},
  +                   ok = api_b_open_and_close(InitState)
  +           end).
   
   
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
positive.code:          api_to_accept_tcp6/1,
           api_to_send_tcp4/1,
           api_to_send_tcp6/1,
           api_to_sendapi_to_udp4/1,
           api_to_sendapi_to_udp6/1,
           api_to_sendmsg_tcp4/1,
           api_to_sendmsg_tcp6/1,
           api_to_recv_udp4/1,
  
negative.code:             ee("failed connecting: ~p", [Reason]),
              ?FAIL({connect, Reason});
          ok ->
              ei("unexpected success (~w) - try next", [ID]),
              api_to_connect_tcp_await_timeout(Socks, ServerSA, ID+1)
      end.
          
  