// FIR_IDENTICAL
// !OPT_IN: kotlin.RequiresOptIn

@RequiresOptIn(level = RequiresOptIn.Level.WARNING)
@Retention(AnnotationRetention.BINARY)
annotation class E1

@RequiresOptIn(level = RequiresOptIn.Level.WARNING)
@Retention(AnnotationRetention.BINARY)
annotation class E3

interface Base1 {
    @E1
    fun foo()
}

interface Base2 {
    fun foo()
}

interface Base3 {
    @E3
    fun foo()
}

class DerivedA : Base1, Base2, Base3 {
    override fun <!OPT_IN_OVERRIDE, OPT_IN_OVERRIDE!>foo<!>() {}
}

class DerivedB : Base1, Base3 {
    @E3
    override fun <!OPT_IN_OVERRIDE!>foo<!>() {}
}

class DerivedC : Base1, Base2, Base3 {
    @E1
    @E3
    override fun foo() {}
}