@propertyWrapper
struct SomeWrapper {

    private var someValue: Int
    var wrappedValue: Int {
        get { someValue }
        set { someValue = newValue }
    }

    init(wrappedValue: Int) {
        someValue = wrappedValue
    }

}

class SomeSuperClass {

    @SomeWrapper var superProperty: Int

    init() {
        print("SomeSuperClass init")
        superProperty = 1
    }

}

final class SomeSubClass: SomeSuperClass {

    @SomeWrapper var subProperty: Int = 123 {
        willSet {
            print("subWillSet - ", superProperty, subProperty, newValue)
        }
    }

    override init() {
        print("SomeSubClass init")
        subProperty = 321
        super.init()
    }

}

let testObject = SomeSubClass()