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diff --git a/testsuite/tests/safeHaskell/check/CheckA.hs b/testsuite/tests/safeHaskell/check/CheckA.hs
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+{-# LANGUAGE Trustworthy #-}
+module CheckA (
+ trace
+ ) where
+
+import qualified Debug.Trace as D
+import qualified Data.ByteString.Lazy.Char8 as BS
+
+-- | Allowed declasification
+trace :: String -> a -> a
+trace s = D.trace $ s ++ show a3
+
+a3 :: BS.ByteString
+a3 = BS.take 3 $ BS.repeat 'a'
+