lazy_implementation_expection

$ swift
Welcome to Apple Swift version 2.1.1 (swiftlang-700.1.101.15 clang-700.1.81). Type :help for assistance.
  1>  
  2.  
  3. class Cat { 
  4.     lazy var voice: String = self.nya() 
  5.     func nya() -> String { 
  6.         return "nya" 
  7.     } 
  8.     deinit { 
  9.         print("deinit") 
 10.     } 
 11. } 
 12.  
 13. class CatImpl { 
 14.     var voiceInited: Bool = false 
 15.     var voiceValue: String = "" 
 16.     var voice: String { 
 17.         get { 
 18.             if (!voiceInited) { 
 19.                 voiceValue = computeLazyValue { 
 20.                     self.nya() 
 21.                 } 
 22.             } 
 23.             return voiceValue 
 24.         } 
 25.     } 
 26.     private func computeLazyValue(@noescape proc: () -> String) -> String { 
 27.         return proc() 
 28.     } 
 29.     func nya() -> String { 
 30.         return "nya" 
 31.     } 
 32.     deinit { 
 33.         print("deinit") 
 34.     } 
 35. } 
 36.  
 37. func testScope() { 
 38.     let _ = Cat() 
 39.     let _ = CatImpl() 
 40. } 
 41.  
 42. print("testScope enter") 
 43. testScope() 
 44. print("testScope exit") 
 45.  
testScope enter
deinit
deinit
testScope exit