old_contents: from chef.base import ChefObject
  
  class Role(ChefObject):
      """A Chef role object."""
  
      url = '/roles'
      attributes = {
          'description': str,
          'run_list': list,
      }
  
new_contents: from chef.base import ChefObject
  
  class Role(ChefObject):
      """A Chef role object."""
  
      url = '/roles'
      attributes = {
          'description': str,
          'run_list': list,
          'default_attributes': dict,
          'override_attributes': dict,
      }
  
subject: Handle role attributes.