type Result<T> = std::result::Result<T, ()>;

pub trait Thing<'t, T>: Sized {
    fn thingy(&'t self) -> Result<T>;
}

impl<'v> Thing<'v, Option<&'v str>> for (i32, Option<String>) {
    fn thingy(&'v self) -> Result<Option<&'v str>> {
        let (_, maybe_string) = &self;
        Ok(maybe_string.as_ref().map(String::as_ref))
    }
}

fn main() {
    let foo: (i32, Option<String>) = (1, Some("foo".to_owned()));
    println!("{:?}", foo.thingy());
}