src/test/ui/union/union-nonrepresentable.stderr

   1 error[E0072]: recursive type `U` has infinite size
   2   --> $DIR/union-nonrepresentable.rs:3:1
   3    |
   4 LL | union U {
   5    | ^^^^^^^ recursive type has infinite size
   6 LL |     a: u8,
   7 LL |     b: U,
   8    |        - recursive without indirection
   9    |
  10 help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `U` representable
  11    |
  12 LL |     b: Box<U>,
  13    |        ++++ +
  14
  15 error: aborting due to previous error
  16
  17 For more information about this error, try `rustc --explain E0072`.