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[plt-scheme] stop-before vs. #:while

From: Grant Rettke (grettke at acm.org)
Date: Sun Mar 16 20:21:19 EDT 2008		 
On Sun, Mar 16, 2008 at 6:56 PM, Doug Orleans <dougorleans at gmail.com> wrote:
> I'm finding stop-before to be kind of awkward:
>
>  (for/list ((i (stop-before (in-naturals) (lambda (i) (>= (* i i) 25))))) i)
>  => (0 1 2 3 4)

Doug how do you run this? I mean what module do you need to include to run it?
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