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Re:Objective-Rust by WesolyKubeczek on Saturday August 29, 2020 @10:11AM (#24316225)
It’s the bit where it has to be a nightly but not a too new nightly that gives heebiejeebies.

Kind of reminds of some godawful government websites which had very finicky requirements in which their ActiveX components would run: precise Internet Explorer builds, with these updates but NOT WITH THESE updates, and god forbid you update your Windows XP past SP1.

Re:Objective-Rust by SAI_Peregrinus on Saturday August 29, 2020 @11:56AM (#24316975)
Nightly is totally unstable. Features get added, and might get removed if the team decides they're not a good idea. So programs that want to use such an experimental feature might only work for a certain few versions of Nightly, because Nightly only guarantees the stability of features that have been released to Stable.

That's why it's strongly recommended not to use Nightly to write your programs: they'll almost certainly break, and since Nightly gets released every 24 hours they might break daily. If you don't have the time to fix things every day, you shouldn't be using the unstable features!