// RUN: %target-run-simple-swift | 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 in x - 1 }, 5))