[Haskell-cafe] Data.ByteString join

Hello, http://cvs.haskell.org/Hugs/pages/libraries/base/Data-ByteString.html but vigalchin@ubuntu:~$ ghci GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help Loading package base ... linking ... done. Prelude> :m +Data.ByteString Prelude Data.ByteString> :t join <interactive>:1:0: Not in scope: `join' Prelude Data.ByteString> Why no "join" function? Regards, Vasili