anchor.diff:  % keys have changed.
   
   nodes_wanted_updated() ->
  -    gen_server:call(?MODULE, nodes_wanted_updated).
  +    gen_server:cast(?MODULE, nodes_wanted_updated).
   
   %% gen_server implementation
   
  
positive.code:     timer:cancel(State#state.timer),
      ok.
  code_change(_OldVsn, State, _) -> {ok, State}.
  handle_cast(_Msg, State)       -> {noreply, State}.
  
  % Read from ns_config nodes_wanted, and add ourselves to the
  
negative.code: 
  handle_call(nodes_wanted, _From, State) ->
      {reply, do_nodes_wanted(), State};
  
  handle_call(Msg, _From, State) ->
      error_logger:info_msg("Unhandled ~p call: ~p~n", [?MODULE, Msg]),
  