anchor.diff:  // log.Logger _log = new log.Logger("common_usage_sorter");
   
   class _log {
  -  static info(String l) {
  -    log.info("common_usage_sorter", l);
  +  static Future info(String l) {
  +    return log.info("common_usage_sorter", l);
     }
   }
   
  
positive.code:           _log.info ("Extraction complete: ${sw.elapsedMilliseconds}/ms");
  
          } catch (e, st) {
            _log.info ("Crash: $e \n $st");
          }
          //
          // log("Adaptive ordering completed");
  
negative.code: 
    @override
    Future sort(DartCompletionRequest request,
        Iterable<CompletionSuggestion> suggestions) async {
      _update(request, suggestions);
      return new Future.value();
    }
  