anchor.diff:  handle_call({delete, Items}, _From, State) ->
       State2 = do_delete(Items, State),
       {reply, ok, State2};
  +
  +handle_call(get_trees, _From, #state{trees=Trees}=State) ->
  +    {reply, Trees, State};
   
   handle_call({update_tree, Id}, From, State) ->
       lager:debug("Updating tree: (vnode)=~p (preflist)=~p", [State#state.index, Id]),
  
positive.code:               undefined | hashtree:acc_fun(T), any(), pid()) -> T.
  compare(Id, Remote, AccFun, Acc, Tree) ->
      gen_server:call(Tree, {compare, Id, Remote, AccFun, Acc}, infinity).
  
  %% @doc Acquire the lock for the specified index_hashtree if not already
  %%      locked, and associate the lock with the calling process.
  
negative.code:          clear/1,
           expire/1,
           destroy/1,
           index_2i_n/0,
           get_trees/1]).
  
  -export([poke/1,
           get_build_time/1]).
  