scala> def uncurry3[A,B,C,D] (f: A => (B => (C => D))) (x: A, y: B, z: C) = f(x)
(y)(z)
uncurry3: [A, B, C, D](f: A => (B => (C => D)))(x: A, y: B, z: C)D

scala> def add(x:Int)(y:Int)(z:Int) = x + y + z
add: (x: Int)(y: Int)(z: Int)Int

scala> def uadd = uncurry3(add _) _
uadd: (Int, Int, Int) => Int

scala> uadd(1,2,3)
res28: Int = 6