I have got this setup: ``` sealed class A sealed c...

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[nhaarman]

I have got this setup:

sealed class A
sealed class B : A()

class C : B()
class D : B()

fun test(a: A): Any {
    return when (a) {
        is C -> ""
        is D -> ""
    }
}

Why doesn't the compiler understand the when expression is exhaustive? It tells me that I should add a case for B.
Is this just not implemented yet, or is there more to this?
(This is written using the 1.1.0 syntax, but the same happens in 1.0.3)