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