[Bug c++/93905] Cannot use Derived type of Base containing both enum and protected destructor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93905

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still missing the required information, and I still can't reproduce this with
gcc version 8.3.1 20200224.