Say, I have an object that replies to .hello method. Now, I want to create another object that will reply to both hello (and all other methods of the original object) and bye methods. Something like this:

x = # original object
y = extend(x) do
  def bye
    # here I can also call methods of the "x" object
    puts "Bye"
  end
end

This new y object is essentially a decorator of x. Is it possible in Ruby?