# File lib/bundler/vendor/thor.rb, line 195
    def check_unknown_options!(options={})
      @check_unknown_options ||= Hash.new
      options.each do |key, value|
        if value
          @check_unknown_options[key] = Array(value)
        else
          @check_unknown_options.delete(key)
        end
      end
      @check_unknown_options
    end