GNU bug report logs - #64391
30.0.50; buffer narrowing slowdown regression in emacs 29

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Message #152 received at 64391 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: acohen <at> ust.hk, 64391 <at> debbugs.gnu.org, eliz <at> gnu.org,
 mattias.engdegard <at> gmail.com, bugs <at> gnus.org
Subject: Re: bug#64391: buffer narrowing slowdown regression in emacs 29
Date: Sun, 09 Jul 2023 15:42:04 -0400

> Whoops, indeed.  (symbolp (eval (cadr rest))) would work,

No, it wouldn't work: we can't (in general) decide at macroexpansion
time whether the expression will return a symbol at runtime.

> but somehow I think it's not TRT and there's a more idiomatic way to
> do that.

Yes: don't do it, or do it via a runtime check rather than
a compile-time check.  But here I don't see any benefit to imposing that
LABEL evaluates to a symbol.


        Stefan

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