// RUN: %swift -i %s | FileCheck %s

func double(x:Int) -> Int {
  return x+x
}

func curriedSubtract(x:Int)(y:Int) -> Int {
  return x-y
}

func twice(f:(Int) -> Int, x:Int) -> Int {
  return f(f(x))
}

// CHECK: 4
println(double(2))
// CHECK: 8
println(double(4))

// CHECK: 12
println(curriedSubtract(16)(4))

// CHECK: 20
println(twice(double, 5))
// CHECK: 7
println(twice({ $0 + 1 }, 5))
// CHECK: 3
println(twice({ |x| x - 1 }, 5))