1 error[E0072]: recursive type `S` has infinite size
2 --> $DIR/issue-3779.rs:1:1
5 | ^^^^^^^^ recursive type has infinite size
7 LL | element: Option<S>
8 | --------- recursive without indirection
10 help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `S` representable
12 LL | element: Box<Option<S>>
15 error: aborting due to previous error
17 For more information about this error, try `rustc --explain E0072`.