gistfile1.rb

class Module
    # just like include except it makes sure to find all
    # the modules that have already included self and 
    # update those features with the given module.
    def include_hard(include_me)
        include include_me
        ObjectSpace.each_object(Module) do |some_module|
            next unless some_module.included_modules.include?(self)
            next if some_module.included_modules.include?(include_me)
            some_module.class_eval { include include_me }
        end
    end
end