diff options
Diffstat (limited to 'src/compiler/GF/Data/Operations.hs')
| -rw-r--r-- | src/compiler/GF/Data/Operations.hs | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/compiler/GF/Data/Operations.hs b/src/compiler/GF/Data/Operations.hs index 4daa9c5d8..08fa15c3e 100644 --- a/src/compiler/GF/Data/Operations.hs +++ b/src/compiler/GF/Data/Operations.hs @@ -53,6 +53,7 @@ import Control.Monad (liftM,liftM2) --,ap import GF.Data.ErrM import GF.Data.Relation +import qualified Control.Monad.Fail as Fail infixr 5 +++ infixr 5 ++- @@ -88,10 +89,10 @@ checkUnique ss = ["overloaded" +++ show s | s <- nub overloads] where overloaded s = length (filter (==s) ss) > 1 -- | this is what happens when matching two values in the same module -unifyMaybe :: (Eq a, Monad m) => Maybe a -> Maybe a -> m (Maybe a) +unifyMaybe :: (Eq a, Fail.MonadFail m) => Maybe a -> Maybe a -> m (Maybe a) unifyMaybe = unifyMaybeBy id -unifyMaybeBy :: (Eq b, Monad m) => (a->b) -> Maybe a -> Maybe a -> m (Maybe a) +unifyMaybeBy :: (Eq b, Fail.MonadFail m) => (a->b) -> Maybe a -> Maybe a -> m (Maybe a) unifyMaybeBy f (Just p1) (Just p2) | f p1==f p2 = return (Just p1) | otherwise = fail "" |