anchor.diff:  	_ -> throw({error, "Wrangler failed to rewrite the refactored files."})
       end.
   
  -write_refactored_files_for_preview(Files) ->
  +write_refactored_files_for_preview(Files, LogMsg) ->
       F = fun(FileAST) ->
   		case FileAST of 
   		    {{FileName,NewFileName}, AST} ->
  
positive.code: 				      end
  			      end, FilePairs),
  		throw({error, "Wrangler failed to output the refactoring result."});
  	_ -> wrangler_preview_server:add_files(FilePairs)
      end.
  
  
  
negative.code:          get_var_exports/1, get_env_vars/1, get_bound_vars/1, get_free_vars/1, 
           get_client_files/2, expand_files/2, get_modules_by_file/1,
           reset_attrs/1, update_ann/2,parse_annotate_file_1/5, parse_annotate_file/3,
           parse_annotate_file/4,write_refactored_files/1, write_refactored_files_for_preview/2,
           build_lib_side_effect_tab/1, build_local_side_effect_tab/2,
  	 build_scc_callgraph/1,build_callercallee_callgraph/1, has_side_effect/3,
           callback_funs/1,auto_imported_bifs/0, called_funs/2, file_format/1, rewrite/2]).
  