gistfile1.rb

module M
  def test
    puts "test"
  end
end
 
class X
  include M
  def test
    puts "instance"
    super
  end
end
 
class Y
  extend M
  def self.test
    puts "class"
    super
  end
end
 
 
X.new.test
X.test
Y.new.test
Y.test