// FIR_IDENTICAL
@file:OptIn(ExperimentalSubclassOptIn::class)

@RequiresOptIn
annotation class ApiMarker

@SubclassOptInRequired(ApiMarker::class)
interface ToBeInheritedByDelegation

open class InheritingByDelegationA(arg: ToBeInheritedByDelegation): <!OPT_IN_USAGE_ERROR!>ToBeInheritedByDelegation<!> by arg

@SubclassOptInRequired(ApiMarker::class)
open class InheritingByDelegationB(arg: ToBeInheritedByDelegation): ToBeInheritedByDelegation by arg