class ViewModel::AccessControl::Tree::Node

def save_root_editability!(traversal_env)
  result = check_delegates(traversal_env,
                           self.class.each_check(:root_children_editable_ifs,      ->(a) { a < Node }),
                           self.class.each_check(:root_children_editable_unlesses, ->(a) { a < Node }))
  store_descendent_editability(traversal_env.view, result)
end