https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109169
--- Comment #1 from steve02081504 <steve_green at qq dot com> ---
(Corrected code)
```c++
template<class T>
struct type_info_t{
//...
template<class U>
static constexpr bool can_convert_to=XXX;
//...
};
template<class T>
constexpr type_info_t<T>type_info{};
```
