class A(val n: Int?) {
    fun foo() {

    }

    <caret>override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (javaClass != other?.javaClass) return false

        other as A

        if (n != other.n) return false

        return true
    }

    override fun hashCode(): Int {
        return n ?: 0
    }
}