[Bug ada/110314] Gnat failed assertion and Allocators with discriminant

[dkm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110314

--- Comment #1 from Marc Poulhiès <dkm at gcc dot gnu.org> ---
This is new in 14, was OK when forking 13.

https://ada.godbolt.org/z/TvbPxYfnP

Currently bisecting.