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diff --git a/src/doc/book/nostarch/preface.md b/src/doc/book/nostarch/preface.md new file mode 100644 index 000000000..5ec239151 --- /dev/null +++ b/src/doc/book/nostarch/preface.md @@ -0,0 +1,22 @@ +# 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 to install or update Rust, and see +Appendix E for information on editions. + +The 2021 Edition of the Rust language includes a small number of improvements +that make Rust more ergonomic and correct some inconsistencies. This rendition +of the book has a number of improvements to address 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 in 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! |