lass Hash
  def method_missing name, *args, &blk
    if name[-1] == "="
      define_singleton_method name do |arg|
        self[name[0...-1].to_sym] = arg
      end

      send(name, *args)
    else if has_key? name.to_sym
      define_singleton_method name do
        self[name.to_sym]
      end

      send(name, *args)

      raise NoMethodError
    end
  end
end