// FORCED open class X { override fun equals(other: Any?) = super.equals(other) override fun hashCode() = super.hashCode() } class A : X() { fun foo() { } override fun equals(other: Any?): Boolean{ if (this === other) return true if (other?.javaClass != javaClass) return false if (!super.equals(other)) return false return true } override fun hashCode(): Int{ return super.hashCode() } }