error[E0072]: recursive type `E` has infinite size
  --> $DIR/infinite-recursive-type.rs:1:1
   |
LL | enum E {
   | ^^^^^^
LL |
LL |     V(E),
   |       - recursive without indirection
   |
help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
   |
LL |     V(Box<E>),
   |       ++++ +

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0072`.