The Ultimate Guide to Rust Programming/

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Deref

Deref

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Alright, I’m tired of fruit. Let’s talk about plain old numbers again. Consider this program that only uses mutable variables, no references:

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Rust 1.40.0
fn main() {
    let x: i32 = 5;
    let mut y: i32 = 6;
    y -= 1;
    assert_eq!(x, y);
    println!("Success");
}

What this means is: create a new immutable variable, x, that holds 5. Then create a mutable variable, y, that holds 6. Subtract 1 from y ...