-functiontest :: TFVec D4 Bit -> TFVec D4 Bit -> TFVec D4 (Bit, Bit)
-functiontest = \v1 v2 -> let r = zip v1 v2 in r
+functiontest :: TFVec D3 (TFVec D4 Bit) -> TFVec D12 Bit
+functiontest = \v -> let r = concat v in r
+
+functiontest2 :: SizedInt D8 -> SizedInt D7
+functiontest2 = \a -> let r = Data.SizedInt.resize a in r