depricated.rb

class Foo
  def self.depricated
    @depricated_meths = true
  end

  def self.method_added(method)
    if @depricated_meths
      puts "#{method} is depricated"
    end
  end
end

class Bar < Foo
  def foo
    puts "fuuu"
  end

  def bar
    puts "bar"
  end

  depricated

  def oh_no!
    puts 'lalala'
  end
end