func fooParam(_ x: Int, _ y: Int){}
func fooTuple(_ x: (Int, Int)) {}

if fooParam is (_: (Int,Int))->() { print("fooParam is (_: (Int,Int))->()") }
// result: fooParam is (_: (Int,Int))->()

if fooTuple is (Int,Int)->() { print("fooTuple is (Int,Int)->()") }
// result: fooTuple is (Int,Int)->()

//--- closure ---

var closureParam = { (x: Int, y: Int) in  }
var closureTuple = { (x: (Int, Int)) in  }

if closureParam is (_: (Int,Int))->() { print("closureParam is (_: (Int,Int))->()") }
// result: closureParam is (_: (Int,Int))->()

if closureTuple is (Int,Int)->() { print("closureTuple is (Int,Int)->()") }
// result: closureTuple is (Int,Int)->()