bug: coding system for mbox?

[Vladimir Volovich <vvv@vvv.vsu.ru>]

Hello,

Vladimir Volovich <vvv@vvv.vsu.ru> writes:

> something strange happened. i pressed "g" in a group buffer to get new
> mail, but Emacs asked "Revisit the file literally?" (what does it mean
> and why this happened?). I answered yes. Then the history of my nnmbox
> groups was broken.

This error happens each time gnus tries to read mail from mbox. In
particular, each time i start gnus. :-( I.e. i start emacs with the
following ~/.emacs file:

---------------------------
(set-default-font "fontset-standard")
(set-language-environment "Cyrillic-KOI8")

(setq nnmail-delete-incoming t)
(setq rfc2047-default-charset 'koi8-r)

(setq gnus-select-method '(nntp "localhost"))
(setq gnus-secondary-select-methods '((nnmbox "")))
---------------------------

There is no ~/.gnus* files. Then i turn on debugging. Then i start
Gnus: M-x gnus. At some point of loading gnus, Emacs asks: "Revisit
the file literally?". If i answer yes, then Emacs `thinks' quite a
while (my mbox file is currently 13Mb, but this is not a problem ---
sometimes i had even bigger ones without problems). After `thinking',
gnus loads normally, and i can more-or-less normally read mail/news
[but there are usually some overestimations of numbers of articles in
my nnmbox groups which gnus reports], until i press `g' in the group
buffer to get new news/mail, in which case the situation repeats
(Emacs again asks that nasty question!).  But if i press `n' on that
question, an error occurs. Here is another backtrace which i made
after fresh start of emacs, then turning on debuggning, starting gnus
and answering `n' to that question:

Signaling: (error "File already visited non-literally")
  signal(error ("File already visited non-literally"))
  error("File already visited non-literally")
  find-file-noselect("/home/vvv/mbox" nil raw)
  apply(find-file-noselect ("/home/vvv/mbox" nil raw))
  nnheader-find-file-noselect("/home/vvv/mbox" nil raw)
  nnmbox-read-mbox()
  nnmbox-request-scan(nil "")
  gnus-request-scan(nil (nnmbox ""))
  gnus-read-active-file(nil nil)
  gnus-setup-news(nil nil nil)
  byte-code("\b„\x0e
  gnus-1(nil nil nil)
  gnus(nil)
  call-interactively(gnus)
  execute-extended-command(nil)
* call-interactively(execute-extended-command)

May be, some contents of mbox makes Emacs to think that mbox is in
some particular coding system (there is some AI?). Maybe, gnus should
force a `literal' opening of mbox? But these are only is my guesses.
If i'll remove mbox and start from the new one, the error will
disappear (but i cannot start from fresh mbox right now; and this bug
should be corrected in any case). *Please* help! This is definitely a
bug of gnus, because it appears in a very clear situation (with that
primitive .emacs file).


 	Best regards, -- Vladimir.