# File lib/chef/role.rb, line 185
    def update_from!(o)
      description(o.description)
      recipes(o.recipes) if defined?(o.recipes)
      default_attributes(o.default_attributes)
      override_attributes(o.override_attributes)
      env_run_lists(o.env_run_lists) unless o.env_run_lists.nil?
      self
    end