kotlin-fork/compiler/testData/diagnostics/tests/callableReference/resolve/resolveTwoReferencesAgainstGenerics.kt

// !LANGUAGE: +NewInference
// !DIAGNOSTICS: -UNUSED_PARAMETER
// WITH_RUNTIME


fun <T> List<Option<T>>.flatten(): List<T> = flatMap { it.fold(::emptyList, ::listOf) }

class Option<out T> {
    fun <R> fold(ifEmpty: () -> R, ifSome: (T) -> R): R = TODO()
}