1 error[E0072]: recursive type `ListNode` has infinite size
2 --> $DIR/multiline-span-E0072.rs:2:1
8 LL | | tail: Option<ListNode>,
9 | | ---------------- recursive without indirection
11 | |_^ recursive type has infinite size
13 help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `ListNode` representable
15 LL | tail: Box<Option<ListNode>>,
18 error: aborting due to previous error
20 For more information about this error, try `rustc --explain E0072`.