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