Re: [Sbcl-devel] Possible Optimizer Bug

[Daniel B. <da...@te...>]

Matthew Schulkind <ms...@co...> writes:

> Hi,
>
> I believe I have found a bug in the SBCL optimizer. This has been
> verified to occur in both 0.8.5 and 0.8.6
>
> Here is the offending code:
>
> (let ((game-board '((+ + +))))
>   (setf (nth 1 (nth 0 game-board)) 'W)
[...]
> (nth 1 (nth 0 game-board)) should clearly be W and not +

It's not clear to me: you're modifying read-only data, so all bets are
off.  See 3-13 in the Lisp FAQ at
http://www.faqs.org/faqs/lisp-faq/part3/


-dan

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