anchor.diff:  import 'package:smart/completion_model/model.dart' as smart_model;
   import 'package:smart/completion_model/ast_extractors.dart' as smart_model_extractor;
   
  +import 'package:logging/logging.dart' as log;
  +
   part 'common_usage_sorter.g.dart';
   
   smart_model.Model model;
  +log.Logger _log = new log.Logger("common_usage_sorter");
   
   
   /**
  
positive.code:             completionScores[k2]["Overall_PValue"]
            ));
  
            log ("TargetType: ${features["TargetType"]}");
  
            completionList = completionList.reversed.toList();
            log ("Ordered completion List");
            log ("\n${completionList.join("\n")}");
  
  
      if (target != null) {
  
negative.code:     return null;
    }
  }
  //
  // log(String s) {
  //   print ("${new DateTime.now().toIso8601String()}: $s");
  //   // String _LOGFILE = "/Users/lukechurch/scratch-working/common_usage_sorter.log";
  //   // new io.File(_LOGFILE).writeAsStringSync("${new DateTime.now().toIso8601String()}: $s \n", mode: io.FileMode.APPEND);
  // }
  