I'm curious how crate maintainers determine what to set rust-version
to.
For some cases it's completely obvious, like when I've used format!("{blah}") -- or some other recent and obvious feature. But in some cases I have crates only using things that, to me, have existed ever since the universe was created.
I realize there's logically no point in setting rust-version
to anything older that the rust version where the support for rust-version
was introduced -- but say you're a stickler for this kind of thing and want to set the right version.. The brute force way to download all stable versions and run a script that tests the crate with all stable versions.
How do you do it? Heuristics? Brute force? Pick an aesthetically pleasing version number?