Slight style changes

lib/GHCup/Utils.hs

@@ -54,7 +54,7 @@ import           System.IO.Error
 import           System.Posix.FilePath          ( getSearchPath
                                                 , takeFileName
                                                 )
-import           System.Posix.Files.ByteString  ( getSymbolicLinkStatus, isSymbolicLink, readSymbolicLink )
+import           System.Posix.Files.ByteString  ( readSymbolicLink )
 import           Text.Regex.Posix
 import           URI.ByteString
 
@@ -417,24 +417,26 @@ ghcToolFiles ver = do
                    ([s|^([a-zA-Z0-9_-]*[a-zA-Z0-9_]-)?ghc$|] :: ByteString)
     )
 
-  let ghcbinPath = toFilePath (bindir </> ghcbin)
-  ghcIsHadrian <- liftIO $ isHadrian ghcbinPath
+  let ghcbinPath = bindir </> ghcbin
+  ghcIsHadrian    <- liftIO $ isHadrian ghcbinPath
   onlyUnversioned <- if ghcIsHadrian
     then pure id
     else do
       (Just symver) <-
         (B.stripPrefix (toFilePath ghcbin <> "-") . takeFileName)
-          <$> (liftIO $ readSymbolicLink ghcbinPath)
+          <$> (liftIO $ readSymbolicLink $ toFilePath ghcbinPath)
       when (B.null symver)
            (throwIO $ userError $ "Fatal: ghc symlink target is broken")
       pure $ filter (\x -> not $ symver `B.isSuffixOf` toFilePath x)
 
   pure $ onlyUnversioned files
-  where
-    -- GHC is moving some builds to Hadrian for bindists, which doesn't create versioned binaries
+ where
+    -- GHC is moving some builds to Hadrian for bindists,
+    -- which doesn't create versioned binaries.
     -- https://gitlab.haskell.org/haskell/ghcup-hs/issues/31
-    isHadrian :: ByteString -> IO Bool
-    isHadrian = (not . isSymbolicLink <$>) . getSymbolicLinkStatus
+  isHadrian :: Path Abs -- ^ ghcbin path
+            -> IO Bool
+  isHadrian = fmap (/= SymbolicLink) . getFileType
 
 
 -- | This file, when residing in ~/.ghcup/ghc/<ver>/ signals that