error[E0072]: recursive type `Baz` has infinite size --> $DIR/sized-cycle-note.rs:9:1 | LL | struct Baz { q: Option } | ^^^^^^^^^^ -------------- recursive without indirection | | | recursive type has infinite size | = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `Baz` representable error[E0072]: recursive type `Foo` has infinite size --> $DIR/sized-cycle-note.rs:11:1 | LL | struct Foo { q: Option } | ^^^^^^^^^^ -------------- recursive without indirection | | | recursive type has infinite size | = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `Foo` representable error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0072`.