Phantom types (Swift)

gistfile1.txt

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let urlpath = Bundle.main.path(forResource: "Info", ofType: "plist")
        let url = NSURL.fileURL(withPath: urlpath!)
        let test = FileSysytemUrl(url as NSURL)
        if (test == nil) {
            print("is empty")
        } else {
            print("its ok")
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

struct FileSysytemUrl {
    let url: NSURL
    init?(_ url: NSURL){
        if !url.isFileURL {
            return nil
        }
        self.url = url
    }
}