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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#18786: closed ((error "Attempt to modify read-only object"
 (("\\.txz\\'" . tar-mode))) on adding mode)
Date: Tue, 21 Oct 2014 18:03:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Tue, 21 Oct 2014 14:02:37 -0400
with message-id <jwv38ah47z4.fsf-monnier+emacsbugs <at> gnu.org>
and subject line Re: bug#18786: (error "Attempt to modify read-only object" (("\\.txz\\'" . tar-mode))) on adding mode
has caused the debbugs.gnu.org bug report #18786,
regarding (error "Attempt to modify read-only object" (("\\.txz\\'" . tar-mode))) on adding mode
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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18786: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18786
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Contact help-debbugs <at> gnu.org with problems

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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

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: 18786-done <at> debbugs.gnu.org
Subject: Re: bug#18786: (error "Attempt to modify read-only object"
 (("\\.txz\\'" . tar-mode))) on adding mode
Date: Tue, 21 Oct 2014 14:02:37 -0400

> Thanks for the pointer!

You're welcome, closed,


        Stefan

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