mod foo {
    pub struct Foo<T> {
        bar: usize,
        inner: T,
    }

    impl<T> Foo<T> {
        pub fn new(inner: T) -> Self {
            Self { bar: 0, inner }
        }
    }

    impl<T> core::ops::Deref for Foo<T> {
        type Target = T;
        fn deref(&self) -> &Self::Target {
            &self.inner
        }
    }
}

struct Bar {
    bar: usize,
}

fn main() {
    let foo = foo::Foo::new(Bar { bar: 1 });
    println!("{}", foo.bar);
}