https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114393
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase which shows this never worked:
```
template <auto _DescriptorFn> struct c1 {};
template <class _Descriptor, auto t = [] { return _Descriptor();}>
inline constexpr auto b_v = t;
template <class _Tag>
using c1_t = c1<b_v<int>>;
template <class _Data>
constexpr auto g(_Data __data) {
return c1_t<_Data>{};
}
void f() {
auto &&b = g(0);
}
```
I don't know understand how the original testcase worked in GCC 13 when the
above testcase never worked ...
