anchor.diff:  %%--------------------------------------------------------------------
   %% @doc
   %% Returns the list of directories that bdberl searches to find databases
  -%% with the number of megabytes available for each dir
  -%%
  -%% @spec get_data_dirs_info() -> {ok, [DirName, Fsid, MbytesAvail]} | {error, Error}
  +%% with the number of megabytes available for each dir.
  +%%
  +%% @spec get_data_dirs_info() -> {ok, [{DirName,Fsid,MbytesAvail}]} | {error, Reason}
   %% where
   %%    DirName = string()
   %%    Fsid = binary()
   %%    MbytesAvail = integer()
  +%%    Reason = any()
   %%
   %% @end
   %%--------------------------------------------------------------------
  
positive.code: %%    Fun = function()
  %%
  %% @equiv update(Db, Key, Fun, undefined, [])
  %% @see update/5
  %% @end
  %%--------------------------------------------------------------------
  -spec update(Db :: db(), Key :: db_key(), Fun :: db_update_fun()) ->
  
negative.code:          txn_stat/0, txn_stat/1,
           txn_stat_print/0, txn_stat_print/1,
           env_stat_print/0, env_stat_print/1, 
           transaction/1, transaction/2, transaction/3, transaction/4,
           put/3, put/4,
           put_r/3, put_r/4,
           put_commit/3, put_commit/4,
           put_commit_r/3, put_commit_r/4,
           get/2, get/3,
           get_r/2, get_r/3,
           update/3, update/4, update/5, update/6, update/7,
           truncate/0, truncate/1,
           delete_database/1,
           cursor_open/1, cursor_next/0, cursor_prev/0, cursor_current/0, cursor_close/0,
  