bug#8369: vc-annotate fails

[Uwe Brauer <oub@mat.ucm.es>]

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Hello 

I have a file under rcs control (about 50 checkins) 
and vc-annotate worked fine, however today vc-annotate returned an error which I 
attach. I am puzzled,

Uwe Brauer 


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Debugger entered--Lisp error: (wrong-type-argument char-or-string-p nil)
  vc-rcs-annotate-command("/home/oub/tex/Francais-B1.2/lettre.tex" #<buffer *Annotate lettre.tex (rev 3.1)*> "3.1")
  apply(vc-rcs-annotate-command ("/home/oub/tex/Francais-B1.2/lettre.tex" #<buffer *Annotate lettre.tex (rev 3.1)*> "3.1"))
  vc-call-backend(RCS annotate-command "/home/oub/tex/Francais-B1.2/lettre.tex" #<buffer *Annotate lettre.tex (rev 3.1)*> "3.1")
  vc-annotate("/home/oub/tex/Francais-B1.2/lettre.tex" "3.1" fullscale)
  call-interactively(vc-annotate)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)

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In GNU Emacs 22.1.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2010-03-26 on rothera, modified by Ubuntu
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.1/leim' '--with-x=yes' '--with-x-toolkit=athena' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

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

Major mode: Debugger

Minor modes in effect:
  shell-dirtrack-mode: t
  global-pabbrev-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
y C-x C-f <backspace> <return> s <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> f M-x v c SPC a n <tab> <return> M-x 
d e b <tab> o <backspace> u <tab> SPC o n <tab> <M-backspace> 
<tab> <return> C-g C-h a d e b u g <return> C-x o <next> 
C-s e r r o r C-x o M-x t o g <tab> d e <tab> e <tab> 
<return> C-x 1 M-x v c SPC a n <tab> <return> C-x C-w 
d e b u g - <M-backspace> v c - a n n - e r r <return> 
C-x C-f t e <tab> <backspace> <backspace> <backspace> 
<return> g + t e s t <return> f C-x C-f t e s t r c 
<backspace> c s <return> t h i s SPC C-x C-s C-x v 
v y e s <return> SPC C-x v v SPC SPC <return> <return> 
n e w SPC C-x C-s C-x v v C-c C-c C-x v v SPC SPC <return> 
<return> <return> a g a i n SPC C-x C-s C-x v v C-c 
C-c C-x k <return> g <down> f C-x v v C-h v C-g C-c 
C-g C-x v l <next> <prior> C-x o C-x 1 C-x C-f <backspace> 
<return> g <up> <up> <up> <down> f g <down> <down> 
f M-x r e p o r <tab> <return>

Recent messages:
Press C-c C-c when you are done editing.
Enter a change comment.  Type C-c C-c when done
Checking in /home/oub/tex/Francais-B1.2/test/testrcs...done
pabbrev scavenging...
Note: file is write protected
Checking out /home/oub/tex/Francais-B1.2/test/testrcs...done
Quit
Loading log-view...done
Directory has changed on disk; type g to update Dired [2 times]
Loading emacsbug...done