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-rw-r--r--Command/Migrate.hs3
1 files changed, 2 insertions, 1 deletions
diff --git a/Command/Migrate.hs b/Command/Migrate.hs
index 2be910851..054db6e27 100644
--- a/Command/Migrate.hs
+++ b/Command/Migrate.hs
@@ -12,6 +12,7 @@ import Control.Applicative
import System.Posix.Files
import System.Directory
import System.FilePath
+import Data.Maybe
import Command
import qualified Annex
@@ -48,7 +49,7 @@ start (b, file) = isAnnexed file $ \(key, oldbackend) -> do
{- Checks if a key is upgradable to a newer representation. -}
{- Ideally, all keys have file size metadata. Old keys may not. -}
upgradableKey :: Key -> Bool
-upgradableKey key = Types.Key.keySize key == Nothing
+upgradableKey key = isNothing $ Types.Key.keySize key
perform :: FilePath -> Key -> Backend Annex -> CommandPerform
perform file oldkey newbackend = do