fun foo(s:Int):Unit{}
fun bar(s:Int):Unit{}

fun main(args: Array<String>) {
    val list = arrayListOf<(Int) -> Unit>()
    list.add(::foo)
    list.add(::bar)
    println(list)
    list.remove(::foo)
    list.remove(::bar)
    println(list)
    println(list.size)
}