[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 #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Related test that works, because there we are in a template function:

```
#include <meta>

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

int main()
{
  [](auto a) {
      using U = [:type_of(^^a):];;
      constexpr auto m = std::meta::extract<U>(std::meta::reflect_constant
(1));
  }(1);
}
```