irbrc.rb

  unless YAML.respond_to?(:dump_file) then
    def YAML.dump_file(path, content)
      File.open(File.expand_path(path), 'wb') do |fh|
        fh.write(content.to_yaml)
      end
    end

    class Object
      def to_y(path=nil)
        path ? YAML.dump_file(path, self) : to_yaml
      end
    end
  end