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 indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `Foo` representable

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 indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `Bar` representable

error: aborting due to 2 previous errors

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