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error[E0072]: recursive type `ListNode` has infinite size
--> $DIR/E0072.rs:1:1
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LL | struct ListNode {
| ^^^^^^^^^^^^^^^ recursive type has infinite size
LL | head: u8,
LL | tail: Option<ListNode>,
| ---------------- recursive without indirection
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help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `ListNode` representable
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LL | tail: Box<Option<ListNode>>,
| ^^^^ ^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0072`.
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