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error[E0072]: recursive type `ListNode` has infinite size
--> $DIR/multiline-span-E0072.rs:2:1
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LL | / struct
LL | | ListNode
| |________^
...
LL | tail: Option<ListNode>,
| -------- recursive without indirection
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help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
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LL | tail: Option<Box<ListNode>>,
| ++++ +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0072`.
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