[Bug c++/80294] [5/6/7 Regression] ICE with constexpr and inheritance

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80294

--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It can be context-specific, NULL elts valid only in some CONSTRUCTORs, e.g.
during constexpr processing or whatever.  In any case it would be good to
understand if it is intentional and what it means.