kotlin-fork/plugins/kotlin-serialization/kotlin-serialization-compiler/testData/diagnostics/DuplicateSerialName.kt

// !DIAGNOSTICS: -UNUSED_PARAMETER,-UNUSED_VARIABLE

// FILE: test.kt
import kotlinx.serialization.*

@Serializable
open class Parent(open val arg: Int)

<!DUPLICATE_SERIAL_NAME("arg")!>@Serializable<!>
class Derived(override val arg: Int): Parent(arg)