include/extend/prepend

test.rb

module Mincluded
  def toto
    puts 'Mincluded#toto'
  end

  module Mprepended
    def toto
      puts 'Mprepended#toto'
    end
  end
  def self.included(base)
    base.prepend(Mprepended)
  end
end

module Mextended
  def toto
    puts 'Mextended#toto'
  end
end

class A
  include Mincluded
  extend Mextended
end

A.ancestors
A.singleton_class.ancestors

A.toto
A.new.toto


module Extensions
  module ClassMethods
    def bar
      'Extended Bar!'
    end
  end

  def self.prepended(base)
    class << base
      prepend ClassMethods
    end
  end
end