Roles10.stderr 281 Bytes
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Roles10.hs:16:12:
    Can't make a derived instance of ‛C Age’
      (even with cunning newtype deriving):
      it is not type-safe to use GeneralizedNewtypeDeriving on this class;
      the last parameter of ‛C’ is at role N
    In the newtype declaration for ‛Age’