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+error[E0072]: recursive types `A` and `B` have infinite size
+ --> $DIR/mutual-struct-recursion.rs:1:1
+ |
+LL | struct A<T> {
+ | ^^^^^^^^^^^
+...
+LL | y: B<T>,
+ | ---- recursive without indirection
+...
+LL | struct B<T> {
+ | ^^^^^^^^^^^
+LL | z: A<T>
+ | ---- recursive without indirection
+ |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+ |
+LL ~ y: Box<B<T>>,
+LL | }
+LL |
+LL | struct B<T> {
+LL ~ z: Box<A<T>>
+ |
+
+error[E0072]: recursive types `C` and `D` have infinite size
+ --> $DIR/mutual-struct-recursion.rs:11:1
+ |
+LL | struct C<T> {
+ | ^^^^^^^^^^^
+...
+LL | y: Option<Option<D<T>>>,
+ | ---- recursive without indirection
+...
+LL | struct D<T> {
+ | ^^^^^^^^^^^
+LL | z: Option<Option<C<T>>>,
+ | ---- recursive without indirection
+ |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+ |
+LL ~ y: Option<Option<Box<D<T>>>>,
+LL | }
+LL |
+LL | struct D<T> {
+LL ~ z: Option<Option<Box<C<T>>>>,
+ |
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0072`.