Typically, you’d want a production application to use a stable version of Rust. At the time of this writing, that’s Rust 1.65.0, which stabilizes a bunch of long-awaited features (GATs, let-else, MIR inlining, split debug info, etc.).

Cool Bear's hot tip

For every Rust release, Mara makes a wonderful recap thread on Twitter, on top of the official announcement.