The Rust Programming Language Book

This version of the text assumes you are using Rust 1.31.0 or later, with in Cargo.toml of all projects to use Rust 2018 Edition idioms. See the “Installation” section of Chapter 1 to install or update Rust, and see Appendix E for information on what editions of Rust are. The HTML format is available online at and offline with installations of Rust made with ; run to open.

Source: doc.rust-lang.org