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$ cargo run
Compiling cons-list v0.1.0 (file:///projects/cons-list)
error[E0072]: recursive type `List` has infinite size
--> src/main.rs:1:1
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1 | enum List {
| ^^^^^^^^^
2 | Cons(i32, List),
| ---- 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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2 | Cons(i32, Box<List>),
| ++++ +
For more information about this error, try `rustc --explain E0072`.
error: could not compile `cons-list` due to previous error
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