GNU bug report logs - #75593
31.0.50; Faulty macro kills Emacs

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Message #53 received at 75593 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: ahprae <at> protonmail.com, mattiase <at> acm.org, Eli Zaretskii <eliz <at> gnu.org>,
 75593 <at> debbugs.gnu.org
Subject: Re: bug#75593: 31.0.50; Faulty macro kills Emacs
Date: Fri, 17 Jan 2025 08:49:27 -0500

> Do we need to fix the case where the lexenv variable is modified by Lisp
> code while it is the lexical environment?
>
> (defmacro f () x)
> (let ((l (list (cons 'l nil))))
>   (setcdr (car l) l)
>   (eval '(progn
> 	   (setcdr l 3)
> 	   (f))
> 	l))
>
> crashes (this is the dotted-list case; the circular case causes an
> unquittable infloop).

😈

> If that's true, maybe we should simply fix the Qmacro code in eval_sub
> and hope for the best.

Sounds good to me,


        Stefan

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