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diff --git a/testsuite/tests/ffi/should_fail/ccfail002.hs b/testsuite/tests/ffi/should_fail/ccfail002.hs
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+
+{-# LANGUAGE ForeignFunctionInterface, UnboxedTuples, MagicHash, UnliftedFFITypes #-}
+
+-- Test for Trac #1680
+
+module ShouldFail where
+
+import GHC.Exts
+
+foreign import ccall unsafe "foo"
+ foo :: Int# -> Int# -> Int# -> (# Int# , Int#, Int# #)