D vs C++ classes?

[Ola Fosheim Grøstad]

On Tuesday, 22 June 2021 at 11:13:52 UTC, jmh530 wrote:
> However, I was thinking what happens if you do something like
> A ac = new C();
>
> How would the compiler handle that?

Runtime error, but this is just a bad idea.

If B and C inherits from A and specializes a() then a D that 
inherits from both B and C should be forced to implement a().

Not really a big issue, I think.