GNU bug report logs - #18786
(error "Attempt to modify read-only object" (("\\.txz\\'" . tar-mode))) on adding mode

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Package: emacs;

Reported by: Boyan Penkov <boyan.penkov <at> gmail.com>

Date: Tue, 21 Oct 2014 13:42:02 UTC

Severity: normal

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

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: Boyan Penkov <boyan.penkov <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: (error "Attempt to modify read-only object" (("\\.txz\\'" .
 tar-mode))) on adding mode
Date: Tue, 21 Oct 2014 09:34:10 -0400

Hey folks,

I have a bunch of stuff like: 

    (nconc auto-mode-alist '(("\\.ctl" . scheme-mode))))

in my .emacs.  

When I launch emacs, the complaint is:

error: Attempt to modify read-only object, ((\.txz\' . tar-mode))

Clearing all the auto-mode-alist additions clears this error, by pulling them out of the .emacs.  Can anybody explain what is going on?

This has emerged after upgrading last night to 24.4 using both http://emacsformacosx.com/ and compiling for myself via homebrew.  I’m on Mac OS 10.10 Yosemite.

Please let me know how to help debug this.

Cheers!

--
Boyan Penkov
www.boyanpenkov.com
This bug report was last modified 10 years and 269 days ago.

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