[Bug c++/108317] dependent vector field is not causing field of this not to be found for fold expression inside a if constexpr block

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108317

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I should mention that <0> works but <0,1> fails. That might get a hint to a
person fixing the issue of what is going wrong inside the compiler.