anchor.diff:  
   output_atom_not_renamed_warnings([], _Msg) -> ok;
   output_atom_not_renamed_warnings(NotRenamed, Msg) ->
  -    ?wrangler_io(Msg, []),
  +    ?log_warning(Msg),
       output_not_renamed_atom_info(NotRenamed).
   output_atom_renamed_warnings([], _Msg) -> ok;
   output_atom_renamed_warnings(Renamed, Msg) ->
  -    ?wrangler_io(Msg, []),
  +    ?log_warning(Msg),
       output_renamed_atom_info(Renamed).
   output_not_renamed_atom_info(FileAndPositions) ->
       Fun = fun ({FileName, Positions}) ->
  
positive.code: 		  lists:flatmap(Fun0, Exprs)
  	  end,
      Msg = lists:flatmap(Fun, FileAndExprs),
      ?wrangler_io(Msg, []).
  
negative.code: 				end, Positions)
  	  end,
      Msg = lists:flatmap(Fun, FileAndPositions),
      ?log_warning(Msg).
  
  output_renamed_atom_info(FileAndExprs) ->
      Fun = fun ({FileName, Exprs}) ->
  