xand a b = hwand a b
-functiontest :: TFVec D4 Bit -> TFVec D4 Bit -> TFVec D4 (Bit, Bit)
-functiontest = \v1 v2 -> let r = zip v1 v2 in r
+functiontest :: TFVec D4 (Bit, Bit) -> (TFVec D4 Bit, TFVec D4 Bit)
+functiontest = \v -> let r = unzip v in r
xhwnot x = hwnot x