Richard Stallman schrieb:
>       I guess
>     the dangers generally outweigh the advantages but there's not much point in
>     marking them obsolete if they're never going to be removed.
> 
> I think that is incorrect.  It is useful to urge people to make their
> code use more modern interfaces regardless of whether we ever delete
> the old ones.
> 
> 

# cd emacs/lisp/ext/bbdbb-2.35
# ./configure --enable-gnus
# make

In toplevel form:
bbdb-whois.el:25:1:Warning: !! The file uses old-style backquotes !!
This functionality has been obsolete for more than 10 years already
and will be removed soon.  See (elisp)Backquote in the manual.

:-)