 
 import Darwin.Mach.mach_time
 import Darwin.C.time
-import AppKit.AppKitDefines
+import Foundation.NSDate
+import QuartzCore
 
 /**
   A struct whose purpose is to pretty-print short durations of time.


public struct Interval: CustomStringConvertible
{
  var ns: Int64

  init(_ nanoseconds: Int64)
  {

      return ns.description + " ns"
  }
  
  public var interval: NSTimeInterval
  {
    return Double(ns)*1e-9
  }
