avoid accidental Show of VectorClock

Removed its Show instance.

Logs/SingleValue.hs

@@ -15,7 +15,6 @@ module Logs.SingleValue where
 
 import Annex.Common
 import qualified Annex.Branch
-import Logs.TimeStamp
 import Logs.Line
 import Annex.VectorClock
 
@@ -28,21 +27,21 @@ class SingleValueSerializable v where
 data LogEntry v = LogEntry
 	{ changed :: VectorClock
 	, value :: v
-	} deriving (Eq, Show, Ord)
+	} deriving (Eq, Ord)
 
 type Log v = S.Set (LogEntry v)
 
 showLog :: (SingleValueSerializable v) => Log v -> String
 showLog = unlines . map showline . S.toList
   where
-	showline (LogEntry t v) = unwords [show t, serialize v]
+	showline (LogEntry c v) = unwords [formatVectorClock c, serialize v]
 
 parseLog :: (Ord v, SingleValueSerializable v) => String -> Log v
 parseLog = S.fromList . mapMaybe parse . splitLines
   where
 	parse line = do
-		let (ts, s) = splitword line
-		c <- VectorClock <$> parsePOSIXTime ts
+		let (sc, s) = splitword line
+		c <- parseVectorClock sc
 		v <- deserialize s
 		Just (LogEntry c v)
 	splitword = separate (== ' ')