anchor.diff:          true -> 0
       end.
   
  --endif.
  +-endif. % -ifdef(undefined).
   
   %% -------------------------------------------------------------------------
   
  
positive.code: 	    {error, einval}
      end.
  
  start_opts([{sys_debug, D} | Opts]) ->
      [{debug, D} | start_opts(Opts)];
  start_opts([Opt | Opts]) ->
      [Opt | start_opts(Opts)];
  start_opts([]) -> [].
  
  
  -compile({inline, [ignore_optname/1]}).
  ignore_optname(Tag) ->
  
negative.code: 
      process_flag(trap_exit, true),
      OwnerMon  = monitor(process, Owner),
      Extra = #{}, % #{debug => true},
      case socket_open(Domain, ExtraOpts, Extra) of
          {ok, Socket} ->
              D  = server_opts(),
              ok = socket:setopt(Socket, {otp,iow}, true),
  