[Bug c++/124229] [reflection] using type alias defined with splice expression of annotation as template arg T to extract causes ICE

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124229

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And this ICEs in a different spot but I think will be fixed by the same patch:

```
#include <meta>

enum class E
{
  X [[=1]]
};

template<typename T>
void foo ()
{
}

int main()
{
  template for (constexpr auto val : define_static_array (enumerators_of
(^^E)))
    {
      constexpr auto a = annotations_of(val)[0];
      using U = [:type_of(a):];
      foo<U>();
    }
}
```