class Count
  attr_accessor :x
  def initialize n
    @x = "test" # アクセスしたい変数
    @func = ->{ n+=1 }
  end
  def call
    @func.call
  end
end

class Yakumo_yukari < Enumerator
  attr_accessor :enum
  attr_accessor :cc
  def initialize n = 0
    y = Enumerator.new do | e |
      @cc = Count.new n
      loop do
        e.yield @cc.call
      end
    end
    @enum = super y
  end
end
y = Yakumo_yukari.new 5
p y.next
p y.next
p y.rewind
p y.next
p y.take(20)

p y.cc.x