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From: Bob Babcock <wssddc@nospam.gis.net>
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Subject: Re: eval-last-sexp in other window
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pjb@informatimago.com (Pascal J. Bourguignon) wrote in
news:87bpri9lhd.fsf@galatea.local: 

>> (defun last-sexp-other-window()
>> "Get last sexp and run it in other window.
>> If there isn't another window, use current window."
>>   (interactive)
>>   (setq ow-sexp (preceding-sexp))
>>   (other-window 1) (eval ow-sexp) (other-window -1) )
> 
> At the very least, use let, not setq!
> 
> (defun last-sexp-other-window()
>  "Get last sexp and run it in other window.
> If there isn't another window, use current window."
>    (interactive)
>    (let ((ow-sexp (preceding-sexp)))
>       (other-window 1)
>       (eval ow-sexp)
>       (other-window -1)))

I will admit that I was surprised when setq worked in this context.
Perhaps there are cases where setq would fail?