[Bug c++/93967] switch on exhaustive enum gives control reaches end of non-void function

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93967

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And see https://gcc.gnu.org/wiki/VerboseDiagnostics#enum_switch