GNU bug report logs - #67008
30.0.50; Multiple major mode parents

Previous Next

Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Thu, 9 Nov 2023 05:41:01 UTC

Severity: normal

Found in version 30.0.50

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

Full log

View this message in rfc822 format

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 67008 <at> debbugs.gnu.org, Ikumi Keita <ikumi <at> ikumi.que.jp>, Yuan Fu <casouri <at> gmail.com>, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#67008: 30.0.50; Multiple major mode parents
Date: Fri, 17 Nov 2023 15:04:24 +0100

> Garbage in, garbage out, eh?

Indeed. Let's document the constraint on the argument and, if it's not too expensive, verify.

>> or if the default error function (caar) is used.
> 
> Same.

Well sort of -- since it's the default error function, we must be able to defend the results of having it used.
Otherwise we're just saying 'if the input graph is cyclic then the output is undefined' but that clearly isn't true since we make an effort to return something semi-useful in that case.

Are the duplicates essential to proper functioning of `cl--class-allparents` and `derived-mode-all-parents`, or would they work just as well with some edge of the cycle removed instead?
This bug report was last modified 1 year and 187 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.