从另一个模块覆盖模块方法

我想从另一个模块 B 重写模块 A 的方法，该方法将对 A 进行猴子补丁。
http://codepad.org/LPMCuszt http://codepad.org/LPMCuszt

module A
  def foo; puts 'A' end
end

module B
  def foo; puts 'B'; super; end
end

A.module_eval { include B } # why no override ???

class C
  include A
end

# must print 'A B', but only prints 'A' :(
C.new.foo

module A
  def foo
    puts 'A'
  end
end

module B
  def foo
    puts 'B'
    super
  end
end

include A # you need to include module A before you can override method

A.module_eval { include B }

class C
  include A
end

C.new.foo # => B A