https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109754
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced further:
```
template <template <class> class> class __meval{};
template <class _Fun, class>
using __tuple_types_fn = decltype(_Fun(), [] {});
template <class _Fun>
struct __mexpand {
template <class _MetaFn> using __f = __tuple_types_fn<_Fun, _MetaFn>;
};
auto t = __meval<__mexpand<int>::template __f>();
```
Removing the lambda inside the decltype removes the ICE.
