[Haskell-cafe] newbie questions (read, etc., with Data.ByteString.Lazy.Char8)

[Mike Coleman]

Thanks for your replies.  Hoogle is pretty cool--I didn't know about that.

I ended up with this, which is pretty close to the original (it will
also bomb if given non-integer input):

import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Maybe as M

main = do
         contents <- L.getContents
         print (sumFile contents)
             where sumFile = sum . map (fst . M.fromJust . L.readInt) . L.words


One further problem I've encountered: My Haskell program runs under
'runghc', but I get a link error when compiling it (GHC 6.8.2, latest
Ubuntu).  Any suggestions?

$ ghc -o LazySumFile LazySumFile.hs
LazySumFile.o: In function `sOz_info':
(.text+0x200): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzyziChar8_readInt_closure'
LazySumFile.o: In function `sOF_info':
(.text+0x35d): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzyziChar8_words_closure'
LazySumFile.o: In function `sRF_info':
(.text+0x4d7): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzy_getContents_closure'
LazySumFile.o: In function `sRF_info':
(.text+0x64f): undefined reference to
`__stginit_bytestringzm0zi9zi0zi1_DataziByteStringziLazzyziChar8_'
LazySumFile.o: In function `sOF_srt':
(.data+0xa0): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzyziChar8_words_closure'
LazySumFile.o: In function `sOF_srt':
(.data+0xa8): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzyziChar8_readInt_closure'
LazySumFile.o: In function `rOh_closure':
(.data+0x110): undefined reference to
`bytestringzm0zi9zi0zi1_DataziByteStringziLazzy_getContents_closure'
collect2: ld returned 1 exit status