ghc/compiler/tests/deriving/drv004.stderr

   1
   2 drv004.hs:5: No instance for:
   3                  `PrelBase.Eq (Foo a{-aIX-} b{-aIY-})'
   4     drv004.hs:5:
   5         in an instance declaration
   6     When checking superclass constraints of an instance declaration
   7
   8
   9 Compilation had errors