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