GNU bug report logs - #74964
31.0.50 master; .dir-locals.el vars does not work with changing major mode

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Package: emacs;

Reported by: Yikai Zhao <yikai <at> z1k.dev>

Date: Thu, 19 Dec 2024 07:55:02 UTC

Severity: normal

Found in version 31.0.50

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

Bug is archived. No further changes may be made.

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From: Yikai Zhao <yikai <at> z1k.dev>
To: 74964 <at> debbugs.gnu.org
Subject: bug#74964: 31.0.50 master; .dir-locals.el vars does not work with changing major mode
Date: Thu, 19 Dec 2024 15:53:58 +0800

How to reproduce:

With following content in /tmp/test/.dir-locals.el:

((nil . ((my/test . "test")))
 (c-mode . ((eval . (when (eq major-mode 'c-mode)
                      (c++-mode))))))
;; I use this code because I want my projects' .h files always opened
in c++ mode

Then open a new file test.c in the folder.

Expected behavior: my/test variable is set.
Actual behavior: my/test variable is not set.

Emacs 29 and 30 does give me the expected result.
This bug report was last modified 122 days ago.

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