GNU bug report logs - #54976
29.0.50; Eshell breaks when unknown entries in eshell-modules-list

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Package: emacs;

Reported by: Sean Whitton <spwhitton <at> spwhitton.name>

Date: Sat, 16 Apr 2022 20:51:01 UTC

Severity: normal

Found in version 29.0.50

Fixed in version 29.1

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Eshell breaks when unknown entries in eshell-modules-list
Date: Sat, 16 Apr 2022 13:50:39 -0700

Hello,

Suppose you put this in your init.el:

    (add-to-list 'eshell-modules-list 'eshell-elecslash)

because you want to use the new em-elecslash.el module I'm working on.

Then if you try to M-x eshell on an older version of Emacs which lacks
em-elecslash, Eshell will fail to initialise at all.

It is easy add a guard (when (locate-library ...)) or similar, but this
is not possible if you have added eshell-elecslash using the customise
interface.  In that case, by enabling the module, youq just make your
init unusable with older Emacs.

It would be better to print a warning, say, rather than error.

-- 
Sean Whitton
This bug report was last modified 2 years and 332 days ago.

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