[racket] export/import problem, and how to debug

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Tue Aug 3 15:46:16 EDT 2010

Interesting -- thanks!

I just tracked down the source of universe.rkt, and find that it does
something similar -- except with better error messages:

> on-tick
on-tick: used out of context


> except-in
. except-in: illegal use of syntax in: except-in


Matthias, is it intentional that you are using this mechanism?  Is
this how we can/should extend universe with our new features?


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