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diff --git a/testsuite/tests/simplCore/should_compile/simpl010.hs b/testsuite/tests/simplCore/should_compile/simpl010.hs
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+++ b/testsuite/tests/simplCore/should_compile/simpl010.hs
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+
+{-# LANGUAGE ExistentialQuantification #-}
+
+-- This tests an interaction between GADTs and join points
+-- The case-of-case transformation can pretty easily result
+-- in a type mis-match, because the join point does not see
+-- the refinement from the case branch
+
+module ShouldCompile( h ) where
+
+data T a = forall b. T b [a] | T2
+
+f :: a -> T a -> [a]
+f x (T _ a) = a ++ a ++ a ++ [x]
+f x T2      = [x]
+
+h :: a -> Bool -> T a -> T a -> [a]
+h x b p q = f x (case b of { True -> p; False -> q })
+	
+\ No newline at end of file