[racket] a little macro exercise

From: Jens Axel Søgaard (jensaxel at soegaard.net)
Date: Sat Oct 9 12:41:02 EDT 2010

Here is yet another solution.
The focus of this one is not to be short, but rather to provide
error messages that refer to cas-cad-e and not to constructs
that cas-cad-e expands to.

Extra tests are provided.

-- 
Jens Axel Søgaard
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