anchor.diff:  is_reqname(clear_hosts) -> true;
   is_reqname(_) -> false.
   
  -%% Add a resource record to the cache if there is space left.
  +%% Add a resource record to the cache if there is a cache.
   %% If the cache is full this function first deletes old entries,
   %% i.e. entries with the oldest access time.
   %%
  
positive.code: 
  %% RR creation
  -compile({inline, [dns_rr_add/5]}).
  dns_rr_add(Domain, Class, Type, TTL, Data) ->
      #dns_rr{
         domain = Domain, class = Class, type = Type,
  
negative.code: -spec handle_info(term(), state()) -> {'noreply', state()}.
  
  handle_info(refresh_timeout, State) ->
      _ = delete_expired(State#state.cache, times()),
      {noreply, State#state{cache_timer = init_timer()}};
  
  handle_info(_Info, State) ->
  