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