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

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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.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
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 09:20:26 -0500

>> Garbage in, garbage out, eh?
> Indeed. Let's document the constraint on the argument and, if it's not
> too expensive, verify.

Duplicates in the input imply a cyclic dependency, so it immediately
fall into the case where the constraints can't be satisfied.

> 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?

They'd work as well.  It's just significantly more work for very
little benefit.


        Stefan
This bug report was last modified 1 year and 187 days ago.

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