modpre.rb

module ZZ
  def self.prepended(target)
    puts "included"
  end
  def hi
    puts 123
    super
  end
end
module CC
  def hi
    puts 990
    super
  end
end
class A
  ex = Module.new
  ex_c = class << ex; self;end
  ex.send(:define_method, :hi) do |*args, &block|
    puts "nnn"
    super(*args, &block)
  end

  prepend ZZ
  prepend CC
  prepend ex
  def hi
    puts "bye"
  end
end

A.new.hi