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+error[E0072]: recursive type `f::E` has infinite size
+ --> $DIR/infinite-recursive-type-impl-trait.rs:2:5
+ |
+LL | enum E {
+ | ^^^^^^
+LL | V(E),
+ | - recursive without indirection
+ |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+ |
+LL | V(Box<E>),
+ | ++++ +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0072`.