This version of the text assumes you’re using Rust 1.85.0 (released 2025-02-17) or later with edition = "2024" in the Cargo.toml file of all projects to configure them to use Rust 2024 Edition idioms. See the “Installation” section of Chapter 1 for instructions on installing or updating Rust, and see Appendix E for information on editions.

The HTML format is available online at https://doc.rust-lang.org/stable/book/ and offline with installations of Rust made with rustup; run rustup doc --book to open.

Several community translations are also available.