             [weak self] _ in
             self?.flushUnused()
             }
-#endif
         }
 
     deinit

//

import Foundation
#if os(OSX)
    internal let MemoryWarningNotification = NSNotification.Name("Siesta.MemoryWarningNotification")
#elseif os(iOS) || os(tvOS)
    import UIKit


    init()
        {
        lowMemoryObserver =
            NotificationCenter.default.addObserver(
                forName: MemoryWarningNotification,
