error[E0072]: recursive type `Bar` has infinite size --> $DIR/issue-3008-1.rs:5:1 | LL | enum Bar { | ^^^^^^^^ ... LL | BarSome(Bar) | --- recursive without indirection | help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle | LL | BarSome(Box) | ++++ + error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0072`.