Kotlin user

KotlinUser.kt

data class KotlinUser(val firstName: String,
                      val lastName: String,
                      val addresses: List<Address> = listOf()) {

    data class Address(val city: String)

    /**
     * This is the same as in `JavaUser`.
     */
    fun getFirstAddressNoInference(): Address {
        val firstAddress: Address = addresses.first()
        return firstAddress
    }
}