Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# 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!