anchor.diff:  %%%-------------------------------------------------------------------
   %%% @author Heinz N. Gies <heinz@licenser.net>
   %%% @copyright (C) 2016, Heinz N. Gies
  -%%% @doc MStore file module. 
  +%%% @doc MStore file module.
   %%%
   %%% @end
   %%% Created :  5 Dec 2016 by Heinz N. Gies <heinz@licenser.net>
  
positive.code:             end
      end.
  
  -spec metric(mfile()) ->
                      btrie:btrie().
  metric(#mfile{index = Index}) ->
      Index.
  %%--------------------------------------------------------------------
  %% @doc
  
negative.code:          count/1,
           fold_idx/3
          ]).
  
  -export_type([mfile/0, fold_fun/0]).
  
  -include_lib("mmath/include/mmath.hrl").
  