| open class AbstractDocument { | |
| fun foo() = "OK" | |
| } | |
| open class ColorDocument : AbstractDocument() { | |
| fun bar(): String { | |
| return if (this is HexColorDocument) { | |
| super.foo() | |
| } else { | |
| "FAIL" | |
| } | |
| } | |
| } | |
| class HexColorDocument : ColorDocument() | |
| fun box() = HexColorDocument().bar() |