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GenCannotDoRep0.hs:6:14: Warning:
    -XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.

GenCannotDoRep0.hs:13:45:
    Can't make a derived instance of `Generic Dynamic':
      Dynamic must be a vanilla data constructor
    In the data declaration for `Dynamic'

GenCannotDoRep0.hs:17:1:
    Can't make a derived instance of `Generic (P Int)':
      P must not be instantiated; try deriving `P a' instead
    In the stand-alone deriving instance for `Generic (P Int)'

GenCannotDoRep0.hs:26:1:
    Can't make a derived instance of `Generic (D Char Char)':
      D must not be instantiated; try deriving `D Char b' instead
    In the stand-alone deriving instance for `Generic (D Char Char)'

GenCannotDoRep0.hs:28:1:
    Can't make a derived instance of `Generic (D Int a)':
      D must not have a datatype context
    In the stand-alone deriving instance for `Generic (D Int a)'