gistfile1.txt

module Foo
  def hello
    puts "Hello from Foo"
  end
end

module Bar
  def self.included(base_klass)
    base_klass.class_eval do
      alias_method :old_hello, :hello
    end
  end
end

class Baz
  include Foo
  include Bar
end

a = Baz.new()
a.old_hello()