[Bug c++/110905] GCC rejects constexpr code that may re-initialize union member

[danakj at orodu dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110905

--- Comment #3 from danakj at orodu dot net ---
Repro down from 37k to under 1000 lines now: https://godbolt.org/z/enMxaqjb6