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kotlinlang

is it possible to create a sub enum class from an enum class?

so lets say you have enum class
```enum class Test{
a,
b,
c}```

and you create a function that accepts Test enum class as parameter

but you only want a and b to be passable to it, not c

I think sealed interfaces in kotlin 1.5 may allow you to write this:
```sealed interface Allowed
sealed class Test {
    object a : Test(), Allowed
    object b : Test(), Allowed
    object c : Test()
}

fun onlyAllowed(foo: Allowed): Unit = TODO()

// compiles
onlyAllowed(Test.a)
onlyAllowed(Test.b)

// does not compile
onlyAllowed(Test.c)```

Actually this will work in kotlin 1.4:
```sealed class Test {
    sealed class Allowed : Test() {
        object a : Allowed()
        object b : Allowed()
    }
    object c : Test()
}```

i think you cannot do that with enum classes, only sealed, right?