Don't skip validity checks for built-in classes (#17355)
[ghc.git] / testsuite / tests / parser / should_fail / readFail039.stderr
1
2 readFail039.hs:8:14: error:
3     Can't make a derived instance of ‘C Foo’:
4       ‘C’ is not a stock derivable class (Eq, Show, etc.)
5       Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
6     In the newtype declaration for ‘Foo’