[Bug c/81845] const union's field doesn't interpret as const in switch/case

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81845

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Aleksandr Slobodeniuk from comment #0)
> What's funny is that I didn't find any compiler, that could compile it.

That usually means it's not a bug then.