On Sun, Oct 03 2010, Stephen Berman wrote:

> I just updated from the Emacs trunk, built with make bootstrap, started
> Emacs with my initializations, started Gnus, typed `1 j' to select a
> group, typed TAB to get a completion list, and got the error in the
> subject line (in gnus-group-completing-read).  After evalling (require
> 'cl) the error ceased.

This is a known issue. I've introduced the use of remove-if-not in a
recent patch, and am not smart enough to write a gnus-remove-if(-not)
working on all types of sequence to replace it.

(Help welcome. :)

-- 
Julien Danjou
// ᐰ <julien@danjou.info>   http://julien.danjou.info