CasePrune.stderr 285 Bytes
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CasePrune.hs:14:31:
    Can't make a derived instance of ‛C A’
      (even with cunning newtype deriving):
      it is not type-safe to use GeneralizedNewtypeDeriving on this class;
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      the last parameter of ‛C’ is at role Nominal
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    In the newtype declaration for ‛A’