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diff --git a/testsuite/tests/simplCore/should_compile/simpl016.hs b/testsuite/tests/simplCore/should_compile/simpl016.hs
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+-- Test for trac ticket #1287; ghc 6.6 and 6.6.1 panicked on this
+
+module ShouldCompile where
+
+{-# SPECIALIZE delta' :: Num b => Int -> Int -> b -> b -> b #-}
+delta' :: Eq a => a -> a -> b -> b -> b
+delta' x y e f = if (x==y) then f else e
+
+{-# SPECIALIZE delta :: Num b => Int -> Int -> b #-}
+delta :: (Eq a, Num b) => a -> a -> b
+delta x y = delta' x y 0 1
+