https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117858
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced all the way:
```
#include <optional>
struct Focus
{
template<class T>
Focus(T newValue) { }
};
void g(std::optional<Focus> f)
{
f = f;
}
```
I could use auto as the type for the Focus's ctor but I wanted it still be
compilable for C++17.
