From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Alan Mackenzie <acm@muc.de>
Cc: 59057@debbugs.gnu.org
Subject: bug#59057: Emacs 29. Byte compiler sometimes forgets about a defvar.
Date: Wed, 09 Nov 2022 12:54:57 -0500 [thread overview]
Message-ID: <jwvsfisqakd.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <Y2ut6a7AONZYR7Sy@ACM> (Alan Mackenzie's message of "Wed, 9 Nov 2022 13:40:57 +0000")
> The basic problem is that defvar is a dog's breakfast of a function. In
> fact, it's two distinct functions sharing a name. These two functions
> have little else to do with eachother.
Yup.
> And defvar appears to be the only function in Emacs where supplying nil
> as an &optional argument has an effect different from omitting it. This
> is bad for anybody trying to learn Emacs Lisp.
Not the only one, sadly (`declare-function` comes to mind :-)), but yes,
it's unusual.
Stefan
next prev parent reply other threads:[~2022-11-09 17:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-05 18:46 bug#59057: Emacs 29. Byte compiler sometimes forgets about a defvar Alan Mackenzie
2022-11-07 13:07 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-07 20:20 ` Alan Mackenzie
2022-11-07 21:29 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-08 11:01 ` Alan Mackenzie
2022-11-08 14:12 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-07 21:31 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-09 13:40 ` Alan Mackenzie
2022-11-09 17:54 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2022-11-24 19:29 ` Stefan Kangas
2022-11-24 19:33 ` Eli Zaretskii
2022-11-24 20:36 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-11-24 21:12 ` Stefan Kangas
2022-11-25 10:36 ` Alan Mackenzie
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvsfisqakd.fsf-monnier+emacs@gnu.org \
--to=bug-gnu-emacs@gnu.org \
--cc=59057@debbugs.gnu.org \
--cc=acm@muc.de \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).