Error found:
at tests/purs/failing/NewtypeInstance.purs:8:1 - 8:40 (line 8, column 1 - line 8, column 40)

  Cannot derive newtype instance for
                    
    Data.Show.Show X
                    
  Make sure this is a newtype.


See https://github.com/purescript/documentation/blob/master/errors/InvalidNewtypeInstance.md for more information,
or to contribute content related to this error.