compctl [ -CDT ] options + options [ + ... ] [ + ] command ...The form with ‘+’ specifies alternative options. Completion is
tried with the options before the first ‘+’. If this produces no
matches completion is tried with the flags after the ‘+’ and so on. If
there are no flags after the last ‘+’ and a match has not been found
up to that point, default completion is tried.
If the list of flags contains a -t with a + character, the next
list of flags is used even if the current list produced matches.