anchor.diff:  
   import 'dart:async';
   import 'dart:io';
  -
  -import 'package:path/path.dart' as p;
   
   import '../constructable_file_system_event.dart';
   import '../path_set.dart';
  
positive.code:       if (entity is! Directory) _files.add(entity.path);
      },
          onError: _emitError,
          onDone: () {
        if (_runningOnBuildbot) {
          print("watcher is ready");
        }
        _readyCompleter.complete();
      },
          cancelOnError: true);
    }
  
  
negative.code:     }, cancelOnError: cancelOnError);
      _subscriptions.add(subscription);
    }
  }
  