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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(UnsafeCell<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(UnsafeCell<Option<Box<Foo>>>) }
| ++++ +
error[E0391]: cycle detected when computing when `Foo` needs drop
--> $DIR/issue-17431-6.rs:3:1
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LL | enum Foo { X(UnsafeCell<Option<Foo>>) }
| ^^^^^^^^
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= note: ...which immediately requires computing when `Foo` needs drop again
= note: cycle used when computing whether `Foo` needs drop
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0072, E0391.
For more information about an error, try `rustc --explain E0072`.
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