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: _readyCompleter.complete,
          cancelOnError: true);
    }
  
  
negative.code:         }
        }
      });
  
      if (_runningOnBuildbot) {
        print("========");
      }
    }
  
    /// Sort all the events in a batch into sets based on their path.
  