From: Adriano Mitre <adriano.mitre@...>
Date: 2011-01-06T15:18:41+09:00
Subject: Re: modules including other modules

Well, this limitation can be circumvented by runnning the following
after each change in MyModule:

ObjectSpace.each_object(Module) do |m|
  if m <= Enumerable
    m.module_eval("include MyModule")
  end
end


In order to understand the drawbacks of this solution, I suggest reading
http://ola-bini.blogspot.com/2007/07/objectspace-to-have-or-not-to-have.html

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