anchor.diff:  class Stats {
   
     Stopwatch _timer = new Stopwatch();
  -  bool _running = false;
   
     int _ms = 0,
         _msMin = 1000,
  
positive.code: 
    void update() {
      end();
    }
  }
negative.code:   }
  
    void begin() {
      _timer.start();
    }
  
    int end() {
  