M-. complains that TAGS file is missing, and refuse to continue

[Simon Josefsson]

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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


Once Emacs has visited a tags file, it insists on it always being
present, even if I happen to, e.g., remove the entire directory.

A better approach would be to turn the error message into a prompt
"File foo no longer exists!  Ignore? (y or n)" and remove that tags
file from the list of tags file it uses.

I looked briefly at etags.el but wasn't able to come up with a good
solution, so I'm only reporting it.

Debugger entered--Lisp error: (error "File /home/jas/src/shishi/crypto/TAGS no 
longer exists!")
  signal(error ("File /home/jas/src/shishi/crypto/TAGS no longer exists!"))
  error("File %s no longer exists!" "/home/jas/src/shishi/crypto/TAGS")
  revert-buffer(t t)
  tags-verify-table("/home/jas/src/shishi/crypto/TAGS")
  visit-tags-table-buffer(same)
  tags-table-including("/home/jas/src/shishi/lib/tkts.c" t)
  visit-tags-table-buffer()
  find-tag-noselect("SHISHI_TKTSHINTFLAGS_ACCEPT_EXPIRED" nil nil)
  find-tag("SHISHI_TKTSHINTFLAGS_ACCEPT_EXPIRED")
  call-interactively(find-tag)



In GNU Emacs 21.3.50.5 (i686-pc-linux-gnu, GTK+ Version 2.2.2)
 of 2003-09-04 on latte.josefsson.org
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: sv_SE.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Recent input:
<return> y e s <return> C-c C-s s l . g n SPC B <backspace> 
y e s <return> SPC q n SPC q SPC q SPC q <C-end> <up> 
SPC q C-c C-s s l . g <down-mouse-1> <mouse-1> g <down-mouse-1> 
<mouse-1> g n n SPC q SPC q n n n n n n n n n SPC q 
C-c C-s s p p p p SPC M-u M-u SPC SPC SPC p q C-c C-s 
s m e m a c s C-x k <return> y e s <return> M-x r e 
p o r <tab> <return>

Recent messages:
Prefetching article 37530 in group nntp+quimby.gnus.org:gnu.emacs.gnus
Fetching articles for nntp+quimby.gnus.org:gnu.emacs.gnus...
Saving /home/jas/.newsrc...
Wrote /home/jas/.newsrc
Saving /home/jas/.newsrc...done
Saving /home/jas/.newsrc.eld...
Saving file /home/jas/.newsrc.eld...
Wrote /home/jas/.newsrc.eld
Saving /home/jas/.newsrc.eld...done
Loading emacsbug...done