collect references to matching items in vector

struct Foo<'a> {
    collection: Vec<usize>,
    matches: Vec<&'a usize>,
}

impl<'a> Foo<'a> {

    pub fn new() -> Self {
        Foo { collection: vec![1,2,3,4,5,6] , matches: vec![] }
    }

    pub fn find_matches(&'a mut self) {
        for item in &self.collection {
            if item % 2 == 0 {
                self.matches.push(&item);
            }
        }
        for item in &self.matches {
            println!("{:?}", item);
        }
    }
}


fn command() {
    let mut foo = Foo::new();
    foo.find_matches();
}


#[test]
fn it_works() {
    command();
}