_

_.swift

let f: ((Int, Int)) -> Void = {
    print($0.0, $0.1)
}

let f1: ((Int, Int)) -> Void = { arg in
    let (x, y) = arg
    print(x, y)
}
        
let f2: ((Int, Int)) -> Void = { (arg: (x: Int, y: Int)) in
    print(arg.x, arg.y)
}
        
let f3: ((Int, Int)) -> Void = { arg in
    print(arg.0, arg.1)
}