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kotlinlang

Currently I have this scenario

```@Serializable(with=CustomSerializer::class)
class Outer(val x: Int, val y: String) {
    val z: AnotherClass = AnotherClass(this)
}```
My `CustomSerializer` simply serializes `AnotherClass`. That is to say, the serialized form of `Outer` is simply the serialization of `AnotherClass`. (Deserialization is obviously not supported).

Is there any way to have this work with `AnotherClass` being an `inner` class? I'd prefer to have `AnotherClass` get the reference to `Outer` by just being an inner class, rather than having to pass in `this`.