@@ -29,7 +29,7 @@ import Control.Monad.State.Strict
30import Data.Dependent.Sum (DSum (..))
30import Data.Dependent.Sum (DSum (..))
31import Data.Monoid
31import Data.Monoid
32−import Data.Traversable
32+import Data.Traversable (traverse)
33import Data.Maybe
33import Data.Maybe
34import qualified Data.IntMap.Strict as IntMap
34import qualified Data.IntMap.Strict as IntMap
35import Control.Monad.Ref
35import Control.Monad.Ref