Can opApply be made @nogc?

[Alex]

On Friday, 19 October 2018 at 23:32:44 UTC, solidstate1991 wrote:
> Since it's a bit difficult to make tree traversal through range 
> (especially if someone wants to make it @nogc), I thought I'll 
> make it through opApply override, however the delegate passed 
> by it doesn't have the @nogc attribute, which would 
> automatically make it incapable to be used in a @nogc context.
>
> I also don't know if it would work with structs instead of 
> classes, since they're easier to handle in a @nogc situation.

https://forum.dlang.org/thread/erznqknpyxzxqivawnix@forum.dlang.org