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diff --git a/testsuite/tests/ghc-regress/simplCore/should_compile/simpl005.hs b/testsuite/tests/ghc-regress/simplCore/should_compile/simpl005.hs
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index abf98a30d2..0000000000
--- a/testsuite/tests/ghc-regress/simplCore/should_compile/simpl005.hs
+++ /dev/null
@@ -1,25 +0,0 @@
--- !!! CPR on newtype with polymorphic argument
-
-{-# OPTIONS -O #-}
-
-module ShouldCompile where
-
-data StateM m s a = STM (s -> m (a,s))
-
-instance Functor m => Functor (StateM m s) where
- fmap f (STM xs) = STM (\s -> fmap (\ (x,s') -> (f x, s'))
- (xs s)
- )
-{- With GHC 4.04 (first release) this program gave:
-
- panic! (the `impossible' happened):
- mk_cpr_let: not a product
- forall a{-ruq-} b{-rur-}.
- (a{-ruq-} -> b{-rur-})
- -> MonadLibrary.StateM{-r2o,x-} m{-a30Y-} s{-a30Z-} a{-ruq-}
- -> MonadLibrary.StateM{-r2o,x-} m{-a30Y-} s{-a30Z-} b{-rur-}
-
- The reason: 'Functor' is a newtype, whose element is a for-all type.
-
- newtype Functor f = Functor (forall a,b. (a->b) -> f a -> f b)
--}