struct Foo {
    s: String
}

fn main() {
    let dest: &mut Vec<&str> = &mut Vec::new();
    let source: Vec<Foo> = vec![
        Foo { s: String::from("example") },
        Foo { s: String::from("with") },
        Foo { s: String::from("vector") }
    ];

    for a in source {
        match a {
            Foo {s} => dest.push(s.as_str())
        }
    }

    println!("{:?}", dest);
}