As a library author I’m not sure which old versions of Rust I should support. The user survey shows that most use latest stable, but ~5% use some older version. If I want to support 99% of Rust users, which version should I target? Debian tends to freeze Rust versions for years. Do people actually use Debian’s Rust, or can it be ignored?
So I’m wondering, are there any precise stats of Rust version usage? For example, could crates-io server log versions of Cargo that make API calls to it, and report the versions it sees similarly to the Android version dashboard?