anchor.diff:  demonitor(MRef, Opts) ->
       erlang:error(badarg, [MRef, Opts]).
   
  +
  +%% -- Socket peername
   
   -spec peername(Socket :: socket()) ->
   		      {ok,
  
positive.code:     erlang:error(badarg, [Socket]).
  
  
  -spec demonitor(MRef) -> true when
        MRef :: reference().
  
  
negative.code: 	error -> % Assume it has already been demonitor'ed
  	    true
      end;
  demonitor(MRef) ->
      erlang:error(badarg, [MRef]).
  
  