从proc声明时从def访问变量

I have something like this:

我有这样的事情：

@menus = { Yay: '/', Yay2: '/yay2' }

@menus.each do |title, link|
  get link do
    erb title.downcase
  end
end

def foo
  'test' + @menus.join(', ')
end
@menus