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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






  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

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