[Bug-gnu-emacs] cperl-mode makes auto-fill-mode docu disappear

[Klaus Zeitler]

This bug report will be sent to the Free Software Foundation,
 not to your local site managers!!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

In GNU Emacs 20.4.1 (hppa2.0-hp-hpux10.20, Motif)
 of Wed Jan 12 2000 on nbghs10
configured using `configure  --with-gcc 
--prefix=/vol/freeware/HP-UX-B.10.20/emacs/20.4 
--sharedstatedir=/vol/freeware/HP-UX-B.10.20/emacs/20.4/share 
--with-x-toolkit=motif --x-includes=/usr/include/X11R6 
--x-libraries=/usr/lib/X11R6 --with-pop'

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

1. start emacs -q
2. load-library cperl-mode
3. C-hf auto-fill-mode -> shows auto-fill-mode help
4. C-xC-f x.pl (load any perl file)
5. M-x cperl-mode (switch to cperl-mode)
6. and now again C-hf auto-fill-mode -> results in:

auto-fill-mode is an interactive compiled Lisp function in `simple'.
(auto-fill-mode &optional ARG)
not documented


Recent input:
v a SPC return d e b SPC o n - e SPC return t return 
escape x l o a d - l i b SPC return c p e r l - m o 
d e return C-x C-f backspace backspace backspace backspace 
backspace / x . p l return C-h f a u t o - f i l l 
- m o d e return down-mouse-1 mouse-1 C-x k return 
down-mouse-1 mouse-1 C-x 1 escape x c p e r l - m o 
d e return C-h f up return C-x 1 menu-bar help-menu 
report-emacs-bug

Recent messages:
Loading cperl-mode...done
Loading perl-mode...
Loading perl-mode...done
Loading view...
Loading view...done
Loading 
/vol/freeware/HP-UX-B.10.20/emacs/20.4/libexec/emacs/20.4/hppa2.0-hp-hpux10.20/fns-20.4.1.el
 (source)...
Loading 
/vol/freeware/HP-UX-B.10.20/emacs/20.4/libexec/emacs/20.4/hppa2.0-hp-hpux10.20/fns-20.4.1.el
 (source)...done
Type C-x 1 to remove help window.  M-C-v to scroll the help. [2 times]
Loading emacsbug...
Loading emacsbug...done