vector example in Rust

main.rs

#[derive(Debug)]
struct Hoge {
    a: i32,
    b: i32,
}   
    
fn main() {
    let mut v = Vec::new();
    v.push(Hoge{a: 1, b: 2});
    v.push(Hoge{a: 2, b: 4});
    v.push(Hoge{a: 3, b: 6});
    
    println!("{:?}", v);

    let h = &mut v[1];
    h.a = 10; 
    println!("{:?}", h);
    println!("{:?}", v);
}