class Widget
  def render_on(document, options = {})
    puts "Original"
  end
end

module FooWrapper
  def new(*args, &block)
    super.extend Wrapping
  end
  module Wrapping
    def render_on(*args)
      puts "FooWrapper::Wrapping"
      super
    end
  end
end

module BarWrapper
  def new(*args, &block)
    super.extend Wrapping
  end
  module Wrapping
    def render_on(*args)
      puts "BarWrapper::Wrapping"
      super
    end
  end
end
  
module BazWrapper
  def new(*args, &block)
    instance = super
    instance.extend(WrappingA)
    instance.extend(WrappingB)
  end
  module WrappingA
    def render_on(*args)
      puts "BazWrapper::WrappingA"
      super
    end
  end
  module WrappingB
    def render_on(*args)
      puts "BazWrapper::WrappingB"
      super
    end
  end
end

Widget.extend FooWrapper
Widget.extend BarWrapper
Widget.extend BazWrapper