Can someone explain why in the following code, I c...

# announcements

[joscha.alisch]

Can someone explain why in the following code, I can override a val property with a subtype of the original type without problem, but trying the same with a var property fails?

open class Parent {

    open val valProperty : Parent
        get() = Parent()

    open var varProperty: Parent
        get() = Parent()
        set(value) {
            // doing something
        }
}

class Child : Parent() {

    override val valProperty : Child
        get() = Child()

    override var varProperty: Child
        get() = Child()
        set(value) {
            // doing something
        }
}

IntelliJ error message is: Var-property type is Child which is not a type of overriden public open var varProperty: Parent defined in ...