struct Foo(std::vec::Vec<u8>);
struct Bar<'foo> {
    foo: &'foo Foo,
}

struct Baz<'foo> {
    foo: &'foo Foo,
    bar: Bar<'foo>,
    iter: std::slice::Iter<'foo, u8>,
}

impl<'foo> Iterator for Baz<'foo> {
    type Item = &'foo u8;

    fn next(&mut self) -> Option<&'foo u8> {
        self.iter.next()
    }
}

impl Foo {
    fn iter<'foo>(&'foo self) -> Baz<'foo> {
        let foo = self;
        let bar = Bar{
            foo: foo,
        };
        Baz {
            foo,
            bar,
            iter: bar.foo.0.iter(),
        }
    }
}

fn main() {
    let foo = Foo(vec![1,2,3]);
    for x in foo.iter() {
        println!("{}", x);
    }
}