comprehensive_rust/src/main.rs

fn main() {
    let mut a: i32 = 10;
    let mut b: &mut i32 = &mut a;

    {
        let c: &mut i32 = &mut b;
        *c = 20;
        println!("c: {c}");
    }

    println!("a: {a}");
    //println!("b: {b}");
}