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From: ShengHuo ZHU <zsh@cs.rochester.edu>
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Subject: Re: one more error
Date: 18 Nov 2000 10:40:48 -0500
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vvv@vsu.ru writes:

> trying to quit gnus in emacs 21.0.90, i get (not always?)
> 
> Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
>   coding-system-plist(nil)
>   coding-system-get(nil alias-coding-systems)
>   coding-system-base(nil)
>   select-safe-coding-system(1 3384 cyrillic-koi8)
>   write-region(1 3384 "/home/noc/vvv/.newsrc" nil t nil)
>   basic-save-buffer-2()
>   basic-save-buffer-1()
>   basic-save-buffer()
>   save-buffer()
>   gnus-gnus-to-newsrc-format()
>   gnus-save-newsrc-file()
>   gnus-group-exit()
>   call-interactively(gnus-group-exit)

It looks they are the same bug.  Maybe it is not a Gnus bug.
Probably, something wrong with coding-category-list.  What is the
value?  And what is the result if you evaluate 
(symbol-value (car coding-category-list)) ?

ShengHuo