-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 :: 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