[racket] Maybe self-inclusion should be forbidden

From: Danny Yoo (dyoo at hashcollision.org)
Date: Tue May 14 15:20:04 EDT 2013

Are you sure you should be using "include"?  Is there a reason why
you're using "include", and not "require"?

If you take advantage of Racket's module system, it should prevent you
from creating import cycles.  Have you looked at:
http://docs.racket-lang.org/guide/modules.html yet?

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