[racket] Polymorphism via compile time dispatch

Hello,

Here's a little experiment in compile time dispatch implemented in Chez 
Scheme:

     http://gist.github.com/585469

The experiment is dependent upon a feature particular to Chez Scheme 
described in section 11.4. "Compile-time Values and Properties" in the 
user's guide:

     http://scheme.com/csug8/syntax.html#./syntax:h4

In particular, I'm using 'define-property'.

Is there a similar facility for Racket? Any tips for doing this sort of 
thing in Racket are welcome. :-)

Ed