Linked list using struct and Box

---

examples/other/linked-list-in-struct/src/main.rs

#[derive(Debug)]
#[allow(dead_code)]
struct Thing {
    data: String,
    next: Option<Box<Thing>>,
}

fn main() {
    let a = Thing {
        data: String::from("First"),
        next: None,
    };
    println!("{:#?}", a);

    let b = Thing {
        data: String::from("Second"),
        next: Some(Box::new(a)),
    };
    println!("{:#?}", b);

    let c = Thing {
        data: String::from("Third"),
        next: Some(Box::new(b)),
    };
    println!("{:#?}", c);
}

Thing {
    data: "First",
    next: None,
}
Thing {
    data: "Second",
    next: Some(
        Thing {
            data: "First",
            next: None,
        },
    ),
}
Thing {
    data: "Third",
    next: Some(
        Thing {
            data: "Second",
            next: Some(
                Thing {
                    data: "First",
                    next: None,
                },
            ),
        },
    ),
}