[racket] filtering syntax

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Jan 13 10:32:55 EST 2012

On Jan 13, 2012, at 10:20 AM, Marijn wrote:

> Right, b would be a constant, namely the function that returns the
> value of a.

a is assignable so b is constant only between 'set! messages 

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