--- attr_writer(name,  ... )

    ° name ؤν񤭹ߥ᥽å (name=) ޤ
    name  Symbol ʸǻꤷޤͤϾ
    nil Ǥ

    Υ᥽åɤ᥽åɤϰʲ̤Ǥ

      def name=(val)
        @name = val
      end

