https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108550
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Slightly reduced:
```
#include <type_traits>
struct unique_ptr
{
int operator->(){return true;};
};
template <class Tp>
constexpr auto is_pointer_v = std::is_pointer<Tp>::value;
template <class Tp, int* = nullptr>
auto Wrap1(int) -> std::integral_constant<bool,
is_pointer_v<decltype(Tp{}.operator->())>>;
template <class Tp>
auto Wrap1(...) -> std::is_pointer<Tp>;
int main() {
static_assert(!decltype(Wrap1<unique_ptr>(0))::value); // error
return 0;
}
```
