shiftR package:deque

shiftRight :: Deque a -> Deque a
deque Deque.Lazy Deque.Strict
, occasionally <math>. Move the last element to the beginning. 
λ toList . shiftRight $ fromList [1,2,3]
[3,1,2]
shiftRight :: MonadReader (Deque a) m => m (Deque a)
deque Deque.Lazy.Reader Deque.Strict.Reader
, occasionally <math>. Move the last element to the beginning.
shiftRight :: MonadState (Deque a) m => m ()
deque Deque.Lazy.State Deque.Strict.State
, occasionally <math>. Move the last element to the beginning.