"Rust 2015" and "Rust 2018" are referring to editions[1] of the language. > Rust ships releases on a six-week cycle. This means that users get a constant strea

"Rust 2015" and "Rust 2018" are referring to editions[1] of the language. > Rust ships releases on a six-week cycle. This means that users get a constant stream of new features. This is much faster than updates for other languages, but this also means that each update is smaller. After a while, all of those tiny changes add up. But, from release to release, it can be hard to look back and say "Wow, between Rust 1.10 and Rust 1.20, Rust has changed a lot!" > Every two or three years, we'll be producing a new edition of Rust. Each edition brings together the features that have landed into a clear package, with fully updated documentation and tooling. New editions ship through the usual release process. [1] https://rust-lang-nursery.github.io/edition-guide/editions/index.html https://rust-lang-nursery.github.io/edition-guide/editions/i...