mark nhc98 import hack

diff --git a/Data/Foldable.hs b/Data/Foldable.hs
index 7c34b77..d245aa9 100644 (file)
--- a/Data/Foldable.hs
+++ b/Data/Foldable.hs
@@ -59,13 +59,16 @@ import Prelude hiding (foldl, foldr, foldl1, foldr1, mapM_, sequence_,
                elem, notElem, concat, concatMap, and, or, any, all,
                sum, product, maximum, minimum)
 import qualified Prelude (foldl, foldr, foldl1, foldr1)
-import Control.Arrow (ArrowZero(..))
 import Control.Applicative
 import Control.Monad (MonadPlus(..))
 import Data.Maybe (fromMaybe, listToMaybe)
 import Data.Monoid
 import Data.Array
 
+#ifdef __NHC__
+import Control.Arrow (ArrowZero(..)) -- work around nhc98 typechecker problem
+#endif
+
 #ifdef __GLASGOW_HASKELL__
 import GHC.Exts (build)
 #endif