#![allow(unused)]

struct Foo([u8; 64]);

fn get_foo() -> (Foo, Box<Foo>) {
    (Foo([0; 64]), Box::new(Foo([0; 64])))
}

fn get_bar() {
    ...
    let foo = get_foo();
    ...
    foo
}

fn main() {
    let foo_vec = vec![Box::new(Foo([0; 64])); 1000];
    for foo in &foo_vec {
        foo.0[32]
    }
    let _ = get_bar();
}