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  1. -- maybe.hs -- "maybe" type
  2. --
  3. -- author :  Sandra Loosemore
  4. -- date   :  22 June 1993
  5. --
  6.  
  7. module Maybe where
  8.  
  9. data Maybe a = Some a | Null
  10.  
  11. {-# ImportLispType (Maybe(Some("identity", "identity", "identity"),
  12.                           Null("not", "'#f")))  #-}
  13.