use std::cell::Cell;

//#[derive(Clone)]
struct Foo
{
    data: Cell<u32>
}

#[derive(Clone)]
struct Bar<'a>
{
    inner: &'a Foo
}

fn main() {

    let a = Foo { data: Cell::new(7) };
    let b = Bar { inner: &a };
    {
        let c = b.clone();
        c.inner.data.set(1);
    }
    println!("{}", a.data.get());

}