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bug#4917: marked as done (Error: Attempt to modify read-only object)


From: Emacs bug Tracking System
Subject: bug#4917: marked as done (Error: Attempt to modify read-only object)
Date: Fri, 13 Nov 2009 02:50:04 +0000

Your message dated Thu, 12 Nov 2009 18:41:53 -0800 (PST)
with message-id <address@hidden>
and subject line Re: bug#4917: Error: Attempt to modify read-only object
has caused the Emacs bug report #4917,
regarding Error: Attempt to modify read-only object
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact address@hidden
immediately.)


-- 
4917: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=4917
Emacs Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: Error: Attempt to modify read-only object Date: Fri, 13 Nov 2009 02:01:37 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (x86_64-pc-linux-gnu)
Starting Emacs fails with the error:

  Warning (initialization): An error occurred while loading `/home/juri/.emacs':

  error: Attempt to modify read-only object

  To ensure normal operation, you should investigate and remove the
  cause of the error in your initialization file.  Start Emacs with
  the `--debug-init' option to view a complete error backtrace.

Starting Emacs with the `--debug-init' option displays:

  Debugger entered--Lisp error: (error "Attempt to modify read-only object")
    delete(("\\`\357\273\277" . utf-8-with-signature) (("\\`BABYL OPTIONS:[     
]*-\\*-[        ]*rmail[        ]*-\\*-" . no-conversion) ("\\`\376\377" . 
utf-16be-with-signature) ("\\`\377\376" . utf-16le-with-signature) 
("\\`\357\273\277" . utf-8-with-signature) ("\\`;ELC" . emacs-mule)))
    (setq auto-coding-regexp-alist (delete (rassoc ... 
auto-coding-regexp-alist) auto-coding-regexp-alist))

The reason of this error in .emacs is the lines that remove a match
for `utf-8-with-signature' from `auto-coding-regexp-alist' that allows
to always display the BOM (Byte-order mark signature) to be able
to remove it without the need to visit files literally:

  (setq auto-coding-regexp-alist
        (delete (rassoc 'utf-8-with-signature auto-coding-regexp-alist)
                auto-coding-regexp-alist))

Before yesterday there were no problems with this.

-- 
Juri Linkov
http://www.jurta.org/emacs/



--- End Message ---
--- Begin Message --- Subject: Re: bug#4917: Error: Attempt to modify read-only object Date: Thu, 12 Nov 2009 18:41:53 -0800 (PST)
Dan Nicolaescu <address@hidden> writes:

  > Juri Linkov <address@hidden> writes:
  > 
  >   > Starting Emacs fails with the error:
  >   > 
  >   >   Warning (initialization): An error occurred while loading 
`/home/juri/.emacs':
  >   > 
  >   >   error: Attempt to modify read-only object
  >   > 
  >   >   To ensure normal operation, you should investigate and remove the
  >   >   cause of the error in your initialization file.  Start Emacs with
  >   >   the `--debug-init' option to view a complete error backtrace.
  >   > 
  >   > Starting Emacs with the `--debug-init' option displays:
  >   > 
  >   >   Debugger entered--Lisp error: (error "Attempt to modify read-only 
object")
  >   >     delete(("\\`\357\273\277" . utf-8-with-signature) (("\\`BABYL 
OPTIONS:[     ]*-\\*-[        ]*rmail[        ]*-\\*-" . no-conversion) 
("\\`\376\377" . utf-16be-with-signature) ("\\`\377\376" . 
utf-16le-with-signature) ("\\`\357\273\277" . utf-8-with-signature) ("\\`;ELC" 
. emacs-mule)))
  >   >     (setq auto-coding-regexp-alist (delete (rassoc ... 
auto-coding-regexp-alist) auto-coding-regexp-alist))
  >   > 
  >   > The reason of this error in .emacs is the lines that remove a match
  >   > for `utf-8-with-signature' from `auto-coding-regexp-alist' that allows
  >   > to always display the BOM (Byte-order mark signature) to be able
  >   > to remove it without the need to visit files literally:
  >   > 
  >   >   (setq auto-coding-regexp-alist
  >   >         (delete (rassoc 'utf-8-with-signature auto-coding-regexp-alist)
  >   >                 auto-coding-regexp-alist))
  >   > 
  >   > Before yesterday there were no problems with this.
  > 
  > This is mine, too aggressive use of purecopy.
  > auto-coding-regexp-alist needs to be changed like this:
  > 
  > (defcustom auto-coding-regexp-alist
  >   (mapcar (lambda (arg) (cons (purecopy (car arg)) (cdr arg)))
  >   '(("\\`BABYL OPTIONS:[ \t]*-\\*-[ \t]*rmail[ \t]*-\\*-"  . no-conversion)
  > [....]
  > 
  > I'll check it in when I get a chance.  If it's in your way, please feel
  > free to do it earlier.

Fixed.  Thanks for catching this.


--- End Message ---

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