testsuite/tests/deriving/should_fail/T3834.stderr


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T3834.hs:9:1: error:
    • Can't make a derived instance of ‘C T’:
        ‘C’ is not a stock derivable class (Eq, Show, etc.)
        Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
    • In the stand-alone deriving instance for ‘C T’