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T2604.hs:7:35:
    Can't make a derived instance of `Typeable (DList a)':
      You need -XDeriveDataTypeable to derive an instance for this class
    In the data type declaration for `DList'

T2604.hs:9:38:
    Can't make a derived instance of `Typeable (NList a)'
      (even with cunning newtype deriving):
      You need -XDeriveDataTypeable to derive an instance for this class
    In the newtype declaration for `NList'