error[E0072]: recursive type `Pong` has infinite size --> $DIR/issue-2718-a.rs:8:5 | LL | pub struct Pong(SendPacket); | ^^^^^^^^^^^^^^^ ---------------- recursive without indirection | help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle | LL | pub struct Pong(Box>); | ++++ + error: aborting due to previous error For more information about this error, try `rustc --explain E0072`.