| ## Preface |
| |
| This version of the text assumes you’re using Rust 1.62.0 (released 2022-06-30) |
| or later with `edition="2021"` in *Cargo.toml* of all projects to use Rust 2021 |
| Edition idioms. See “Installation” on page 1 for instructions on installing or |
| updating Rust, and see Appendix E for information on editions. |
| |
| The 2021 Edition of the Rust language includes a number of improvements that |
| make Rust more ergonomic and correct some inconsistencies. On top of a general |
| update to reflect these improvements, this rendition of the book has a number |
| of improvements to address specific feedback: |
| |
| * Chapter 7 contains a new quick reference section on organizing your code into |
| multiple files with modules. |
| * Chapter 13 has new and improved closure examples that more clearly illustrate |
| captures, the `move` keyword, and the `Fn` traits. |
| * We fixed a number of small errors and imprecise wording throughout the book. |
| Thank you to the readers who reported them! |
| Note that any code from earlier renditions of this book that compiled will |
| continue to compile with the relevant edition in the project’s *Cargo.toml*, |
| even as you update the Rust compiler version you’re using. That’s Rust’s |
| backward compatibility guarantees at work! |
