From: Prince Nez <prince.nez@...>
Date: 2009-08-18T19:20:02+09:00
Subject: Including a module in an included module.

    module M1; end
    module M2; include M1; end
    module M1; DOG = :woof; end
    module M2; DOG; end
    # => :woof

I can add to a module after it has been included. Neat.

    module M1; DOG = :woof; end
    module M2; include M1; end
    module M3; include M2; end
    module M3; DOG; end
    # => :woof

Including a module seems to give me any modules that it includes. Swish.

    module M2; end
    module M3; include M2; end
    module M1; DOG = :woof; end
    module M2; include M1; end
    module M3; DOG; end
    # => NameError: uninitialized constant M3::DOG

So I assumed I'd be able to include a module in a module after it has
been included, if you get my drift. It surprises me that this dog
doesn't bark.
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