tcl-indent-for-comment broken in Emacs 21

[Geert Kloosterman]

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In GNU Emacs 21.1.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-11-12 on guitars.rock.roll
Important settings:
  value of $LC_ALL: C
  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
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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

Emacs 21 seems to have a new tcl mode: tcl.el instead of tcl-mode.el.
I didn't see this mentioned in the NEWS file...

Here's the real problem: When I use tcl-indent-for-comment (M-;) on an
empty line I get the following error message:

    Wrong type argument: number-or-marker-p, nil

I expected it to insert "#" or ";#" at `comment-column'.  
I tested this with '-q --no-site-file'.

Friendliest regards,

Geert Kloosterman


Recent input:
<switch-frame> M-x t c l - m o <tab> <return> <tab> 
<tab> M-; C-n M-; C-x b <return> M-b M-b M-b M-b M-b 
M-b M-b M-b C-SPC C-e M-w C-x b <return> M-x r e p 
o <tab> r <tab> <return>

Recent messages:
Loading tcl...done
Loading newcomment...done
call-interactively: Beginning of buffer
call-interactively: Wrong type argument: number-or-marker-p, nil
Mark set
Making completion list...
Loading view...done
Loading emacsbug...
Loading /home/geertk/share/emacs/desire/sendmail/bbdb.ecf...done
Loading emacsbug...done