[Bug c++/123281] [16 Regression] ICE using gcc 20251221 snapshot with openscad-2025.05.01_pre-r1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123281

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
Tiny tweak to make Clang accept it too:
```
template <typename> void make_scope_guard();
template <typename Callback> struct final {
  friend void make_scope_guard<Callback>() noexcept(Callback ::value);
};
```