Code shared from the Rust Playground

playground.rs

#![allow(unused)]

struct A {
    b: usize,
    c: Vec<isize>,
}

impl A {
    fn e(&mut self) {
        let A {
            b,
            c: ref mut d,
        } = self;
        d.push(3);
        self.c.push(4)
    }
}

fn main() {
    let mut a = &mut A {
        b: 1,
        c: vec![2],
    };
    a.e();
    println!("{:?}", a.c);
}