anchor.diff:    RootScope(Object context, this._astParser, this._parser,
               GetterCache cacheGetter, FilterMap filterMap,
               this._exceptionHandler, this._ttl, this._zone,
  -            this._scopeStats)
  -      : super(context, null, null,
  +            ScopeStats _scopeStats)
  +      : _scopeStats = _scopeStats,
  +        super(context, null, null,
               new RootWatchGroup(new DirtyCheckingChangeDetector(cacheGetter), context),
               new RootWatchGroup(new DirtyCheckingChangeDetector(cacheGetter), context),
  -            '')
  +            '',
  +            _scopeStats)
     {
       _zone.onTurnDone = apply;
       _zone.onError = (e, s, ls) => _exceptionHandler(e, s);
  
positive.code:   void digestEnd() {
    }
  
    toString() =>
      'digest #$_digestLoopNo:'
      'Field: ${_stat(digestFieldStopwatch)} '
      'Eval: ${_stat(digestEvalStopwatch)} '
      'Process: ${_stat(digestProcessStopwatch)}';
  }
  
  
  
negative.code:   }
  
    void digestStart() {
      if (report) print('digest');
      _digestStopwatchReset();
      _digestLoopNo = 0;
    }
  