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[racket] first and rest etc. only work on proper lists

From: Pierpaolo Bernardi (olopierpa at gmail.com)
Date: Tue May 15 07:55:39 EDT 2012		 
On Tue, May 15, 2012 at 1:31 PM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> FWIW, the list? check that is inside first and rest caches its result
> in the header information in the cons cells it traverses.

I see. I was missing this piece of information.

Cheers
P.
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