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Rust 1.78.0

`const` and `static`

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

Constants are always immutable, and may only be set to a constant expression, not the result of a function call or any other value that could only be computed at runtime.

Global variables are called static in Rust.

const MAX_POINTS: u32 = 100_000;
static HELLO_WORLD: &str = "Hello, world!";

You can find the latest version about constants here, and about statics here.