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diff --git a/testsuite/tests/generics/GFunctor/Main.hs b/testsuite/tests/generics/GFunctor/Main.hs
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+++ b/testsuite/tests/generics/GFunctor/Main.hs
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+{-# LANGUAGE DeriveGeneric #-}
+
+module Main where
+
+import GHC.Generics hiding (C, D)
+import GFunctor
+
+-- We should be able to generate a generic representation for these types
+data D a = D0 | D1 { d11 :: a, d12 :: (D a) }
+  deriving (Show, Generic, Generic1)
+
+-- Example values
+d0 :: D Char
+d0 = D0
+d1 = D1 (Just 'p') D0
+
+d2 :: (Fractional a) => D (a,a)
+d2 = D1 (3,0.14) D0
+
+-- Generic instances
+instance GFunctor D
+
+-- Tests
+main = print ( gmap (+1) (Just 2)
+             , gmap (+1) [0,1,2]
+             , gmap (+1) (0,0)
+             , gmap undefined d0 :: D ()
+             , gmap (const 'q') d1
+             , gmap (\(a,b) -> a + b) d2 :: D Float)