// !CHECK_TYPE

import kotlin.reflect.*

class A

fun main() {
    fun foo() {}
    fun bar(<!UNUSED_PARAMETER!>x<!>: Int) {}
    fun baz() = "OK"
    
    class B {
        fun A.ext() {
            val x = ::foo
            val y = ::bar
            val z = ::baz

            checkSubtype<KFunction0<Unit>>(x)
            checkSubtype<KFunction1<Int, Unit>>(y)
            checkSubtype<KFunction0<String>>(z)
        }
    }
}