minibuffer-complete-and-exit does not work

[Hiroshi Fujishima]

Symptoms:

(info "(emacs)Completion") describe the following.
|    For example, when `M-x' uses the minibuffer to read the name of a
| command, it provides a list of all available Emacs command names to
| complete against.  The completion keys match the minibuffer text
| against all the command names, find any additional name characters
| implied by the ones already present in the minibuffer, and add those
| characters to the ones you have given.  This is what makes it possible
| to type `M-x ins <SPC> b <RET>' instead of `M-x insert-buffer <RET>'
| (for example).

But, when I type `M-x ins <SPC> b <RET>', Emacs says
`call-interactively: Symbol's function definition is void: insert-b'.

In GNU Emacs 21.3.50.1 (sparc-sun-solaris2.9, X toolkit, Xaw3d scroll bars)
 of 2004-11-22 on alex
Distributor `Sun Microsystems, Inc.', version 11.0.6610
configured using `configure '--prefix=/usr/local/emacs' 
'--x-includes=/usr/local/include' '--x-libraries=/usr/local/lib' 
'--without-xim''

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: ja_JP.eucJP
  locale-coding-system: japanese-iso-8bit
  default-enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  iswitchb-mode: t
  show-paren-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

Recent input:
C-h i m e m <tab> <return> C-u C-s c o m p C-a m c 
o m p l <tab> <return> C-v C-p C-p <escape> < C-u C-s 
M - x C-s C-s C-s C-g C-g C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n <escape> x C-h 
C-k <return> <escape> x C-h k <return> C-x b h e <return> 
C-n C-n C-n C-k ESC x r e p o r <tab> <return>

Recent messages:
call-interactively: No command name given
Type C-x 1 to remove help window.  C-M-v to scroll the help.
Loading mi-util...done
Loading mi-elisp...done
Loading /home/pooh/tmp/mode-info/mi-elisp.idx...done
Loading mi-emacs...done
Loading /home/pooh/tmp/mode-info/mi-emacs.idx...done
Quit
byte-code: Buffer is read-only: #<buffer *Help*>
Loading emacsbug...done