error[E0072]: recursive type `Foo` has infinite size
  --> $DIR/recursive-type-field.rs:3:1
   |
LL | struct Foo<'a> {
   | ^^^^^^^^^^^^^^ recursive type has infinite size
LL |     bar: Bar<'a>,
   |          ------- recursive without indirection
   |
help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `Foo` representable
   |
LL |     bar: Box<Bar<'a>>,
   |          ++++       +

error[E0072]: recursive type `Bar` has infinite size
  --> $DIR/recursive-type-field.rs:8:1
   |
LL | struct Bar<'a> {
   | ^^^^^^^^^^^^^^ recursive type has infinite size
LL |     y: (Foo<'a>, Foo<'a>),
   |        ------------------ recursive without indirection
LL |     z: Option<Bar<'a>>,
   |        --------------- recursive without indirection
...
LL |     d: [Bar<'a>; 1],
   |        ------------ recursive without indirection
LL |     e: Foo<'a>,
   |        ------- recursive without indirection
LL |     x: Bar<'a>,
   |        ------- recursive without indirection
   |
   = help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `Bar` representable

error: aborting due to 2 previous errors

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