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[racket] Changing the pretty print columns when running raco expand

From: Konrad Hinsen (konrad.hinsen at fastmail.net)
Date: Thu Nov 7 12:28:35 EST 2013		 
Neil Van Dyke writes:

 > "raco expand"?  If you've not yet tried the Macro Stepper feature of 
 > DrRacket, you are in for a treat.

And for Emacs fans, Geiser provides macro-expansion-at-a-keypress.

Konrad.
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