anchor.diff:      });
     }
   
  -  bool isSyncResource(Resource resource) {
  +  bool _isSyncResource(Resource resource) {
       return _roots.any((root) => root is SyncFolderRoot && root.resource == resource);
     }
   
  
positive.code: 
    String get uuid => '${_root.id}';
  
    Future refresh() {
      // Only allow one refresh call at a time.
      assert(_inRefresh == false);
  
negative.code:    */
    bool isDerived() => parent != null && parent.isDerived();
  
    /**
     * Returns an iterable of the children of the resource as a pre-order traversal
     * of the tree of subcontainers and their children.
  