CTFE limitation on reinterpreting cast

[Kapendev]

On Monday, 28 September 2026 at 22:50:21 UTC, Rambutan wrote:
> Without the cast the initializer &Bobj is fine, but with it 
> this does not compile.

Not what you want, but here:

```d
C* ptr() => cast(C*) &Bobj;

void main() {
     ptr.thingInC += 69;
}
```