anchor.diff:    ValueListenable<List<String>> get stdio => _stdio;
   
     IsolateRef isolateRef;
  -
  -  InstanceRef get reportedException => _reportedException;
  -  InstanceRef _reportedException;
   
     /// Clears the contents of stdio.
     void clearStdio() {
  
positive.code:   void _clearCaches() {
      _scriptCache.clear();
      _lastEvent = null;
      _reportedException = null;
      _breakPositionsMap.clear();
      _stdio.value = [];
      _uriToScriptMap.clear();
  
negative.code:       case EventKind.kPauseInterrupted:
        case EventKind.kPauseException:
        case EventKind.kPausePostRequest:
          await _pause(true, pauseEvent: event);
          break;
        // TODO(djshuckerow): switch the _breakpoints notifier to a 'ListNotifier'
        // that knows how to notify when performing a list edit operation.
  