anchor.diff:  %% File processing.
   %%--------------------------------------------------------------------
   
  --spec get_all_files(args()) -> files().
  +-spec get_all_files(args()) -> [file:filename(),...].
   
   get_all_files(#args{files = Fs, files_r = Ds}) ->
     case filter_fd(Fs, Ds, fun test_erl_file_exclude_ann/1) of
  
positive.code: map__lookup(Key, Map) ->
    try dict:fetch(Key, Map) catch error:_ -> none end.
  
  -spec map__from_list([{term(), term()}]) -> map().
  map__from_list(List) ->
    dict:from_list(List).
  
  
negative.code: 
  %%--------------------------------------------------------------------
  %% A convenient abstraction of a Key-Value mapping data structure
  %% specialized for the uses in this module
  %%--------------------------------------------------------------------
  
  -type map() :: dict().
  