Warn about using the GC

[Alexandru Ermicioi]

On Sunday, 14 January 2024 at 12:32:26 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
>
> But it is not a complete solution that is suitable for all 
> scenarios.
>
> This is not an either/or situation. We can have both solutions 
> as different attributes.

Perhaps there should be a `@trustedgc`, similar to what`@trusted` 
is in safe system?
That would fix callback issue.

Best regards,
Alexandru.