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error[E0072]: recursive type `MList` has infinite size
--> $DIR/infinite-tag-type-recursion.rs:1:1
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LL | enum MList { Cons(isize, MList), Nil }
| ^^^^^^^^^^ ----- 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 | enum MList { Cons(isize, Box<MList>), Nil }
| ++++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0072`.
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