Files under VC minor mode don't work with Which Function mode

[Jakub Narebski]

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In GNU Emacs 21.3.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2003-10-27 on daffy.perf.redhat.com
configured using `configure  --host=i386-redhat-linux --build=i386-redhat-linux 
--target=i386-redhat-linux-gnu --program-prefix= --prefix=/usr 
--exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc 
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib 
--libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com 
--mandir=/usr/share/man --infodir=/usr/share/info --with-gcc --with-pop 
--with-sound'
Important settings:
  value of $LC_ALL: pl_PL
  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: pl_PL
  locale-coding-system: iso-latin-2
  default-enable-multibyte-characters: t

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

When I tried to use `which-function-mode' with Emacs Lisp file which
is under control of version control software (rcs using RCS/
directory), and under VC minor mode, I have in the modeline *always* 
[???] instead of the name of the current function (or [Variables] if
we are before the definition of first function).

When I copied the file to other directory, so it was not using VC
minor mode, the Which Function mode worked perfectly as it should.

-- 
Jakub Narebski
Poland
-- 
Jakub Narebski
Poland