arnaud.oqube:
Hello, I have a strange issue which sprang today out of nowhere. When I load a certain file using bytestring package in Ghci using emacs, I got the following error:
Couldn't match expected type `Data.ByteString.Internal.ByteString' against inferred type `bytestring-0.9.1.4:Data.ByteString.Internal.ByteString' In the second argument of `hPutStrLn', namely `(fromString msgs)' In a stmt of a 'do' expression: hPutStrLn cnx (fromString msgs)
The same file compiles fine on the command-line. I have a single installation of haskell platform, using ghc 6.10.4, on windows XP.
Looks like you might have two versions of bytestring installed (ghc-pkg list bytestring) and are attempting to combine them. The diamond dependency problem. * delete the old version (ghc-pkg unregister) * recompile any libs that depend on it.