proxy.rb

# http://use.perl.org/~Ovid/journal/39301

module MixinUpper
  def a; 'A'; end
  def b; 'B'; end
end

module MixinLower
  def a; 'a'; end
  def b; 'b'; end
end

module MixinUpperProxy
  include MixinUpper
  alias :upper_a :a
  alias :upper_b :b
end

class Mixer
  include MixinUpperProxy
  include MixinLower
end


mixer = Mixer.new
puts mixer.a #=> a
puts mixer.b #=> a
puts mixer.upper_a #=> A