[EMACS] bug in version control with Emacs 21.1 and 21.2

[Laurent MUGNIER <Laurent.Mugnier@onera.fr>]

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In GNU Emacs 21.1.1 (sparc-sun-solaris2.7, X toolkit, Xaw3d scroll bars)
 of 2003-03-03 on yeti
configured using `configure  --prefix=/usr/gnu'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: iso_8859_1
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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

In my .emacs I setq
      vc-checkout-switches "-zLT"       ;default Time Zone = Local (RCS/CVS) 
      vc-checkin-switches "-zLT"        ;idem
      vc-register-switches "-zLT"       ;idem

If I then try to register a file, I get the following error message:
apply: Wrong type argument: stringp, ("-zLT")

I guess that the "-zLT" string is converted to a list and then checked as a
string! 

If the string is "zLT" instead I get the same error.

This bug was not present in Emacs 20.6 and 20.7.

If I remove the 3 customization lines above from my .emacs, the registering
works fine.

Thanks in advance for your help.


	   Laurent Mugnier.