rust/src/test/ui/structs-enums/struct-rec/mutual-struct-recursion.rs

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struct A<T> {
//~^ ERROR recursive type `A` has infinite size
x: T,
y: B<T>,
}
struct B<T> {
//~^ ERROR recursive type `B` has infinite size
z: A<T>
}
struct C<T> {
//~^ ERROR recursive type `C` has infinite size
x: T,
y: Option<Option<D<T>>>,
}
struct D<T> {
//~^ ERROR recursive type `D` has infinite size
z: Option<Option<C<T>>>,
}
fn main() {}