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bug#18786: (error "Attempt to modify read-only object" (("\\.txz\\'" . t


From: Boyan Penkov
Subject: bug#18786: (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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