[racket] filtering syntax

From: Sam Tobin-Hochstadt (samth at ccs.neu.edu)
Date: Fri Jan 13 09:52:52 EST 2012

On Fri, Jan 13, 2012 at 9:23 AM, Matthias Felleisen
<matthias at ccs.neu.edu> wrote:
> compute the free variables with a simple recursive pass over core syntax,

Note that there's code to do this here:

sam th
samth at ccs.neu.edu

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