testsuite/tests/deriving/should_fail/drvfail008.stderr


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drvfail008.hs:10:43:
    Can't make a derived instance of `Monad M':
      `Monad' is not a derivable class
      Try -XGeneralizedNewtypeDeriving for GHC's newtype-deriving extension
    In the newtype declaration for `M'