Multiple receivers in Kotlin

MultiReceiver.kt

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

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

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

It would have saved me hours if someone told me, how to actually call sample now.
Answer is: sample(X(1), Y(2), Z(3))
I hope that helps future desperate souls looking for ways to accept multiple receivers.

Everyone trying to find out what sample would look like without the multiReceiver helper:

val sample: X.() -> Y.() -> Z.() -> Int =  { { { x + y + z } } }

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

val sampleResult = sample(X(1))(Y(2))(Z(3))