# File lib/declarative_authorization/development_support/development_support.rb, line 169
        def ancestors (priv_symbol = nil)
          priv_symbol ||= @privilege
          # context-specific?
          (@engine.rev_priv_hierarchy[[priv_symbol, nil]] || []).
              collect {|higher_priv| ancestors(higher_priv) }.flatten +
            (priv_symbol == @privilege ? [] : [Privilege.for_sym(priv_symbol, @engine)])
        end