anchor.diff:      // probably comes from FSEvents reporting an add that happened prior to the
       // watch beginning.
       if (type == ChangeType.ADD && _files.contains(path)) return;
  +
  +    if (_runningOnBuildbot) {
  +      print("emitting $type ${p.relative(path, from: directory)}");
  +    }
   
       _eventsController.add(new WatchEvent(type, path));
     }
  
positive.code:         }
        }
      });
    }
  
    /// Sort all the events in a batch into sets based on their path.
  
negative.code:     var fileExists = new File(path).existsSync();
      var dirExists = new Directory(path).existsSync();
  
      if (_runningOnBuildbot) {
        print("file existed: $fileExisted");
        print("dir existed: $dirExisted");
        print("file exists: $fileExists");
        print("dir exists: $dirExists");
      }
  
      var events = [];
      if (fileExisted) {
        if (fileExists) {
  