testsuite/tests/ghc-regress/parser/should_fail/readFail039.stderr


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readFail039.hs:8:14:
    Can't make a derived instance of `C Foo':
      `C' is not a derivable class
      Try -XGeneralizedNewtypeDeriving for GHC's newtype-deriving extension
    In the newtype declaration for `Foo'