#![allow(unused)]
fn main() {
    let mut x = A {inner: "bar"};

    foo(&mut x);
    foo(&mut x);
}

struct A<'a> {
    inner: &'a str,
}

fn foo<'a, 'b: 'a>(p: &'b mut A<'b>)-> &'a str {
    p.inner
}