extern(C++): override nonvirtual member function

[sfp]

On Friday, 25 April 2025 at 05:24:55 UTC, evilrat wrote:
> both f() would be marked `final` in D which will tell it is 
> 'nonvirtual override', and then you will have more headache.

I don't care if I have a headache or not, I need to wrap the C++ 
code and I can't change it. Needs must.

I tried this already. E.g.:
```
extern(C++) class A {
   final void f() {}

   void g() {} // need at least one virtual function...
}

extern(C++) class B: A {
   final void f() {}
}

void main() {}
```
and dmd complains about it:
```
Error: function `main.B.f` cannot override `final` function 
`main.A.f`
```