Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/fps/tests/zipwith.hs
import qualified Data.ByteString as P import qualified Data.ByteString.Char8 as C main = do a <- P.readFile "bigdata" b <- P.readFile "bigdata" print . P.length $ (P.pack (P.zipWith (const) a b)) -- should specialise