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diff --git a/testsuite/tests/th/T5217.hs b/testsuite/tests/th/T5217.hs
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+{-# LANGUAGE GADTs #-}
+
+module T5217 where
+import Language.Haskell.TH
+
+$([d| data T a b where { T1 :: Int -> T Int Char
+ ; T2 :: a -> T a a
+ ; T3 :: a -> T [a] a
+ ; T4 :: a -> b -> T b [a] } |])
+
+