look like `cargo fix` does not work. Or I missing something. Tried on this:
```rust
mod s {
    pub struct S {
        foo: u8,
    }

    impl S {
        pub fn foo(&self) -> &u8 {
            &self.foo
        }
    }
}
use s::S;

fn get_foo(s: &S) -> String {
    s.foo.to_string()
}
```