-functiontest :: TFVec D4 (TFVec D3 Bit) -> (TFVec D12 Bit, TFVec D3 Bit, TFVec D3 (TFVec D3 Bit))
-functiontest = \v -> let r = (concat v, head v, tail v) in r
+functiontest :: SizedWord D8 -> SizedWord D8
+functiontest = \a -> let r = a + ((-1) :: SizedWord D8) in r