--- method_missing(name, args, ... )

    ƤӤ줿᥽åɤƤʤäRuby Υ᥽å
    ƤӽФޤƤӽФ˼Ԥ᥽åɤ̾ (Symbol) Ȥ
    λΰ name  arg ... Ϥޤ

    ǥեȤǤϤΥ᥽åɤ㳰 NameError ȯޤ

--- Object#method_missing(method_symbol, ...)
        ᥽åɤ֥ȤƤʤäȤˤΥ᥽åɤ
        ƤФ롣ȤäƼʬΤʤ᥽åɤۤΥ֥
        ˰Ѿ뤳ȤǤ롣

        :
          def hoge.method_missing(message, *arg)
              @to_obj.send(message, *arg)
          end

