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Rust 1.26.0

Raw Pointers

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

Raw pointers are allowed to ignore many of the rules that references have to follow.

let mut num = 5;

let r1 = &num as *const i32;
let r2 = &mut num as *mut i32;Run

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