# File lib/rspec/core/configuration.rb, line 310
      def configure_group(group)
        modules = {
          :include => [] + group.included_modules,
          :extend  => [] + group.ancestors
        }

        include_or_extend_modules.each do |include_or_extend, mod, filters|
          next unless group.apply?(:all?, filters)
          next if modules[include_or_extend].include?(mod)
          modules[include_or_extend] << mod
          group.send(include_or_extend, mod)
        end
      end