Rust 1.90.0-nightly
b03b3a7ec

`unsafe`

There is a new edition of the book and this is an old link.

Rust has a second language hiding out inside of it, unsafe Rust, which does not enforce memory safety guarantees.

Here are the relevant sections in the new and old books:

• in the current edition: Ch 20.01 — Unsafe Rust
• The Rustonomicon, The Dark Arts of Advanced and Unsafe Rust Programming
• In the first edition: Ch 3.36 — unsafe