gistfile1.rb

# This works

require 'rubygems'
require 'activesupport'

class Base
  def self.cry
    "#{self.name}.cry called!"
  end
end

module Behaviour
  def blame
    puts self.class.parent.const_get(:Child).cry
  end
end

module Parent
  class Child < Base
  end

  class Sibling < Base
    include Behaviour
  end
end

sibling = Parent::Sibling.new
sibling.blame # NameError here