anchor.diff:      {noreply, State};
   handle_info({insert, Key, Val}, State) ->
       do_insert(State, Key, Val),
  +    {noreply, State};
  +handle_info({insert_new, Key, Val}, State) ->
  +    do_insert_new(State, Key, Val),
       {noreply, State};
   handle_info({delete, Key}, #state{tab = Tab} = State) ->
       ets:delete(Tab, Key),
  
positive.code: 
  %% API
  -export([new/1, new/2, start_link/2, delete/1, delete/2, delete/3,
  	 lookup/2, lookup/3, insert/3, insert/4, clear/1, filter/2,
  	 all/0, info/1, info/2]).
  %% gen_server callbacks
  -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
  	 terminate/2, code_change/3]).
  
negative.code: handle_call({insert, Key, Val}, _From, State) ->
      do_insert(State, Key, Val),
      {reply, ok, State};
  handle_call({insert_new, Key, Val}, _From, State) ->
      {reply, do_insert_new(State, Key, Val), State};
  handle_call(_Request, _From, State) ->
      Reply = ok,
      {reply, Reply, State}.
  