Warn about using the GC

[Zoadian]

On Sunday, 14 January 2024 at 19:53:21 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
>
>> There is another way, though. In @system code, the gc delegate 
>> can be forcibly cast to be @nogc (as far as the type system is 
>> concerned - it doesn't change the behavior of the delegate).

yes, that way my idea too, but as tg pointed out to me, the @nogc 
function could store the delegate somewhere and another @nogc 
would then be able to access it.
you this only works if you can ensure nothing escapes the 
function.