struct Foo<'a> {
    bar: &'a i32
}

/*impl<'a, 'b: 'a> Foo<'b> {
    fn new(bar: &'b i32) -> Self {
        Foo { bar }
    }

    fn qux(&'a mut self) -> &'b i32 {
        self.bar
    }
}*/

impl<'a> Foo<'a> {
    fn qux(&'a mut self) -> &'a i32 {
        self.bar
    }
}

fn main() {
    let aaaaa = 0;

    let mut f = Foo { bar: &aaaaa };

    println!("{}", f.qux());
    println!("{}", f.qux());
    println!("{}", f.qux());
    println!("{}", f.qux());
}