kotlin interface equals

import kotlin.test.assertEquals
import kotlin.test.assertNotEquals

interface Token<T: Enum<T>> {
    val type: T
    val value: String
        get() = type.name.toLowerCase()
}

enum class ExampleToken: Token<ExampleToken> {
    A,
    B,
    C;

    override val type = this
}
class ConcreteToken<T: Enum<T>>(override val type: T, override val value: String): Token<T>


fun main(args: Array<String>) {
    val t1: Token<ExampleToken> = ExampleToken.A
    val t2: Token<ExampleToken> = ExampleToken.B
    val t3: Token<ExampleToken> = ConcreteToken(ExampleToken.A, "nope")
    val t4: Token<ExampleToken> = ConcreteToken(ExampleToken.A, "a")

    assertNotEquals(t1, t2)
    assertNotEquals(t1, t3)
    assertEquals(t1, t4, "this fails :(")
}