It is perfectly fine to import class methods...

...without specifying the class, see Haskell 2010 5.2.1.
That allows us to get rid of some conditional includes.

Nevetheless, we still conditionally include foldr', as we do not
use it for base <4.8.

Author: foxik

Data/Sequence.hs

@@ -158,14 +158,9 @@ import Control.DeepSeq (NFData(rnf))
 import Control.Monad (MonadPlus(..), ap)
 import Data.Monoid (Monoid(..))
 import Data.Functor (Functor(..))
-#if MIN_VERSION_base(4,8,0)
-import Data.Foldable (Foldable(foldl, foldl1, foldr, foldr1, foldMap, foldl', foldr', toList))
-#else
-#if MIN_VERSION_base(4,6,0)
-import Data.Foldable (Foldable(foldl, foldl1, foldr, foldr1, foldMap, foldl'), toList)
-#else
 import Data.Foldable (Foldable(foldl, foldl1, foldr, foldr1, foldMap), foldl', toList)
-#endif
+#if MIN_VERSION_base(4,8,0)
+import Data.Foldable (foldr')
 #endif
 import Data.Traversable
 import Data.Typeable