anchor.diff:    @override
     ListAdapter buildAdapter() {
       assert(logic is AbstractAdapter<T>);
  -    assert(_throwIfDisposed());
       ListAdapter result;
       if (logic is AbstractAdapter<T>) {
         final AbstractAdapter<T> abstractAdapter = logic;
  
positive.code: 
    @override
    void pageBroadcast(Action action, {bool excludeSelf}) {
      assert(_throwIfDisposed());
      store.sendBroadcast(
        action,
        excluded: excludeSelf == true ? _onBroadcast : null,
  
negative.code: 
    @override
    BuildContext get context {
      return _buildContext;
    }
  
  