https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127260
--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Reduced down to:
```
struct E { int i; };
constexpr int s = 1;
template <const int& Elem>
struct V { };
template <int =0>
struct Pick {
static constexpr const int& z = s;
V<z> t;
};
Pick<> t;
```
