samples/pushdown_method_sample.rb
class A
  def a
  end
  def A.a
  end
end

class B < A
  def y
    z
  end
  def z
  end
  def w
  end
  def B.x
    a
  end

  private :z
end

class C < B
  
  def w
  end
  class D < B
    def x
      p 1
      a
    end
  end
end

-- END --