readEither in ghc-6.10. ?

Hi, I've got errors when compiling with ghc-6.10.0.20081007 Not in scope: `readEither' It is imported via: import GHC.Read (readEither) and used to work with ghc-6.8. What should I use as replacement? Cheers Christian P.S. It is also not mentioned in the changes: http://www.haskell.org/ghc/dist/stable/docs/users_guide/release-6-10-1.html