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