What should happen here?

[Kagamin]

On Wednesday, 22 September 2021 at 12:31:48 UTC, Steven 
Schveighoffer wrote:
> And by the way I tried naive usage, and the compiler saw right 
> through that:
>
> ```d
> auto c = new C;
> scope(exit) auto fake = c; // still collected early
> ```

That just means you don't properly use it. It's so in this case, 
but it isn't always the case. For an example how D interoperates 
with the C heap see the Array container: 
https://github.com/dlang/phobos/blob/master/std/container/array.d#L604
Another option is to allocate objects in the C heap, then they 
won't have this problem.