Problem with minibuffer completion

[Johan Bockgård]

$ emacs -Q

completion-common-substring => nil

After quitting out of the minibuffer (C-h f TAB C-g)
completion-common-substring hasn't been unbound correctly:

completion-common-substring => t

After that completion is broken:

C-h f TAB

=>

Making completion list...
run-hooks: Wrong type argument: stringp, #<objfwd to t>

(Other people have failed to reproduce this bug. I, too, can't
reproduce it on another system.)



In GNU Emacs 22.0.50.23 (x86_64-unknown-linux-gnu, X toolkit)
 of 2005-10-17 on muon
X server distributor `The X.Org Foundation', version 11.0.60802000
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: Lisp Interaction

Minor modes in effect:
  mouse-wheel-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
C-h f <tab> C-g C-h f <tab> C-g M-x r e p o r t <tab> 
<return>

Recent messages:
Loading disp-table...done
Loading image...done
For information about the GNU Project and its goals, type C-h C-p.
Loading help-fns...done
Making completion list...
Quit
Making completion list...
run-hooks: Wrong type argument: stringp, #<objfwd to t>
Quit
Loading emacsbug...done

-- 
Johan Bockgård