https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124012
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Boris Staletic from comment #3)
> auto bind_function() {
> constexpr auto attrs = extra_attributes{};
> sink(attrs.rvp);
> }
>
> And this one compiles:
>
> auto bind_function() {
> constexpr auto attrs = extra_attributes{};
> char rvp = attrs.rvp;
> sink(rvp);
> }
>
> I'd expect all three versions to work, but if not, then at least to behave
> the same.
In the latter case it compiles because attrs.rvp in there is constant evaluated
(not manifestly-constant evaluated though) to 0, which is done e.g. for var
initializers, while random subexpressions of other expressions (like the call
in the first case) are not.
