private 멤버나 constructor는 공변성 검증 대상이 아님

PrivateOrConstructorArgGeneric.kt

class Box<out T, FUN: ()->T>(v: T, private val nextval: FUN) {

    private var value: T = v

    private fun log(v: T) {
        println(v)
    }

    fun logPublic(v: T) { // Type parameter T is declared as 'out' but occurs in 'in' position in type T
        println(v)
    }

    fun get():T {
        value = nextval()
        log(value)
        logPublic(value)
        return value
    }
}