+-- | The sum of a collection of actions, generalizing 'concat'.
+asum :: (Foldable t, Alternative f) => t (f a) -> f a
+{-# INLINE asum #-}
+asum = foldr (<|>) empty
+
+-- | The sum of a collection of actions, generalizing 'concat'.
+msum :: (Foldable t, MonadPlus m) => t (m a) -> m a
+{-# INLINE msum #-}
+msum = foldr mplus mzero
+