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+error[E0072]: recursive type `U` has infinite size
+  --> $DIR/union-nonrepresentable.rs:1:1
+   |
+LL | union U {
+   | ^^^^^^^ recursive type has infinite size
+LL |     a: u8,
+LL |     b: std::mem::ManuallyDrop<U>,
+   |        ------------------------- recursive without indirection
+   |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `U` representable
+   |
+LL |     b: Box<std::mem::ManuallyDrop<U>>,
+   |        ++++                         +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0072`.