Cargo edition 2024

[andrewbaxter]

Does this use any features required by 40f7956 ? This prevents usage with older cargo versions, I was wondering if the edition could be lowered again.

[denisandroid]

Hi, this is the first time I've encountered the desire to downgrade an edition version, usually it's the other way around, can you tell me why you need an older version?

As for the situation, I'd like to keep edition 2024, since it's a newer version and it additionally provides the ability to use more complex async ||, async move ||, but I can't imagine how to express edition through the same features, and most likely it's not possible at all.

[andrewbaxter]

Oh sure, fair enough. NixOS until just a week or so ago was on 1.82 and I think there's still a fair amount of <1.85 in the wild, plus environments that need to use official/vetted compiler versions, so I don't want to block adoption of my libraries by depending on this. The latest debian is 1.63 (2021), ubuntu is 1.84 (2021).

Good points about async closures, and I see how that's relevant. On the other hand though, this is what I assumed was a fairly small utility so needing to keep up with the latest release just to use it is unexpected. Maybe 2024 is a one-off early upgrade thing?

Do macros need to be aware of async? I thought they'd be agnostic of the 2nd parameter... maybe these are advanced features I haven't looked into yet. And proc macro output should be interpreted based on the caller's edition, unless you meant that you want to use async move within the proc macro code itself.

[denisandroid]

With Debian the situation is simpler, since this box is in its lists https://packages.debian.org/en/source/sid/rust-enclose and accordingly it should work with the package with rust from its package base, but in nixos it seems not to be there.