bkahlert

fun <A, B, C, R> multiReceiver(f: A.() -> B.() -> C.() -> R) = { a: A, b: B, c: C -> f(a)(b)(c) }

val sample1: (X, Y, Z) -> Int = multiReceiver { { { x + y + z } } }
val sample2: X.() -> Y.() -> Z.() -> Int =  { { { x + y + z } } }

class X(val x: Int)
class Y(val y: Int)
class Z(val z: Int)

fun main() {