[Haskell-cafe] how to compile this in yhc?

Is there some way to compile the following function in yhc? works in ghc with glasgow exts deactivated, yhc complains context for Prelude.read needed (in final line) readfloat :: String -> Maybe Float readfloat x | null parse || not (null leftover) = fail $ "myRead: "++x | otherwise = return v where parse@((v,leftover):ps) = readsPrec 0 x thanks! --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.