#[repr(C)]
#[derive(Debug)]
struct PairFoo {
    fst: Foo,
    snd: Foo,
}

#[derive(Debug)]
struct Foo(u64);
fn reinterstruct(box_pair: Box<PairFoo>) -> Vec<Foo> {
    let ref_pair: &mut PairFoo = Box::leak(box_pair);
    let ptr_foo: *mut Foo = ref_pair as *mut PairFoo as *mut Foo;
    unsafe {
        Vec::from_raw_parts(ptr_foo, 2, 2)
    }
}

fn main() {
    let pair_foo = Box::new(PairFoo {
        fst: Foo(42),
        snd: Foo(1337),
    });
    println!("pair_foo = {:?}", pair_foo);
    for (n, foo) in reinterstruct(pair_foo).into_iter().enumerate() {
        println!("foo #{} = {:?}", n, foo);
    }
}