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[racket] Again on bindings visibility in eval

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Jul 15 10:17:27 EDT 2011		 
1. If they use gensym and gentemp in a reasonably systematic way, 

2. and if they rule out scoped macros, 

THEN 

A. they get close to a hygienic expander 

B. they lose a lot of expressiveness compared to Racket. 
Try building something like class.rkt in Clojure and report back.
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