Using io-choice.

CabalDev.hs

@@ -5,17 +5,17 @@ module CabalDev (modifyOptions) where
   options ghc-mod uses to check the source.  Otherwise just pass it on.
 -}
 
-import Control.Applicative ((<$>),(<|>))
+import Control.Applicative ((<$>))
 import Control.Exception (throwIO)
+import Control.Exception.IOChoice
 import Data.List (find)
 import System.Directory
 import System.FilePath (splitPath,joinPath,(</>))
 import Text.Regex.Posix ((=~))
 import Types
-import Data.Alternative.IO ()
 
 modifyOptions :: Options -> IO Options
-modifyOptions opts = found <|> notFound
+modifyOptions opts = found ||> notFound
   where
     found = addPath opts <$> findCabalDev
     notFound = return opts