# File lib/bundler/dsl.rb, line 237
    def group(*args, &blk)
      options = args.last.is_a?(Hash) ? args.pop.dup : {}
      normalize_group_options(options, args)

      @groups.concat args

      if options["optional"]
        optional_groups = args - @optional_groups
        @optional_groups.concat optional_groups
      end

      yield
    ensure
      args.each { @groups.pop }
    end