This works because your properties are read-only, thus allowed to be covariant.
If you add a setter, the compiler will complain.
-DW
> On Mar 10, 2017, at 5:33 AM, Anton Zhilin via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Looks like a compiler bug, since it works with classes:
>
> class Base {}
> class Derived : Base {}
>
> class A {
> var x: Base? { return Base() }
> }
>
> class B : A {
> override var x: Derived? { return Derived() }
> }
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