fix the deserialization of flags from the GFO files

src/compiler/GF/Grammar/Binary.hs

@@ -17,7 +17,6 @@ import Data.Binary
 --import Control.Monad
 import qualified Data.Map as Map
 import qualified Data.ByteString.Char8 as BS
-import Text.PrettyPrint (render)
 
 import GF.Data.Operations
 import GF.Infra.Ident
@@ -25,7 +24,7 @@ import GF.Infra.Option
 import GF.Grammar.Grammar
 
 import PGF() -- Binary instances
-import PGF.Data(ppLit)
+import PGF.Data(Literal(..))
 
 -- Please change this every time when the GFO format is changed
 gfoVersion = "GF03"
@@ -93,9 +92,13 @@ instance Binary ModuleStatus where
 instance Binary Options where
   put = put . optionsGFO
   get = do opts <- get
-           case parseModuleOptions ["--" ++ flag ++ "=" ++ render (ppLit value) | (flag,value) <- opts] of
+           case parseModuleOptions ["--" ++ flag ++ "=" ++ toString value | (flag,value) <- opts] of
              Ok  x   -> return x
              Bad msg -> fail msg
+           where
+             toString (LStr s) = s
+             toString (LInt n) = show n
+             toString (LFlt d) = show d
 
 instance Binary Production where
   put (Production res funid args) = put (res,funid,args)