#[derive(Debug)]
struct Foo {}

#[derive(Debug)]
struct Bar<'a>(&'a Foo);

impl<'a> Bar<'a> {
    pub fn new(x: &'a Foo) -> Self { Bar(x) }
    pub fn new2() -> Self { Bar(&Foo{}) }
}


fn main() {
    let x = Bar::new2();
    println!("x = {:?}", &x);
}