Example of flattening scopes

gistfile1.txt

module M
  def self.included(base)
    base.class_eval do
      singleton_class = (class << self; self; end)
      singleton_class.send(:define_method, :foo) do
          puts "in foo! base is #{base}"
      end
    end
  end
end

class C
  include M
end

C.foo