Destructors can't be @nogc?

[Jim]

On Saturday, 24 July 2021 at 02:02:00 UTC, Mike Parker wrote:
> The problem is that you've marked main as `@nogc`, and 
> `destroy` is not `@nogc`. Remove the annotation from main and 
> it will compile.

In that case, what should we use to check functions called from 
`main` are not using the garbage collector?

Because it seems like we can't use classes with `@nogc`. We can 
write `.deinit()` for all our classes but what about the existing 
ones?