error[E0072]: recursive type `A` has infinite size --> $DIR/issue-74224.rs:1:1 | LL | struct A { | ^^^^^^^^^^^ ... LL | y: A>, | ------- recursive without indirection | help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle | LL | y: Box>>, | ++++ + error: aborting due to previous error For more information about this error, try `rustc --explain E0072`.