import UIKit

class Label: UILabel {
    deinit {
        print("deinit label")
    }
}

class NotLeakViewController1: UIViewController {
    @IBOutlet weak var label: Label!
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

class NotLeakViewController2: UIViewController {
    var label: Label = Label()
    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(label)
        _ = Array(Mirror(reflecting: self).children) // Iterate mirror children
    }
}

class LeakViewController: UIViewController {
    @IBOutlet weak var label: Label!
    override func viewDidLoad() {
        super.viewDidLoad()
        _ = Array(Mirror(reflecting: self).children) // Iterate mirror children
    }
}