class ValueClass<ValueType> {
    init(_ initialValue: ValueType) {
        value = initialValue
    }

    var value: ValueType
}

class TestSubclass: ValueClass<Int> {}

func tempFunc() {
    let tmp = TestSubclass(42)  // error here
}

class Something {
    init(_ initialValue: Int) {
        value = initialValue
    }
    
    var value: Int
}

class SomethingSubclass: Something {}

func tempSomething() {
    let tmp = SomethingSubclass(42)
}