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error[E0072]: recursive type `Foo` has infinite size
--> $DIR/issue-17431-6.rs:3:1
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LL | enum Foo { X(Mutex<Option<Foo>>) }
| ^^^^^^^^ --- recursive without indirection
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help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
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LL | enum Foo { X(Mutex<Option<Box<Foo>>>) }
| ++++ +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0072`.
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