Function immutable_seq::finger_tree::deep

pub fn deep<T, M>(left: Digit<T, M>,
                  middle: Lazy<FingerTree<T, M>>,
                  right: Digit<T, M>)
                  -> Lazy<FingerTree<T, M>> where T: Measure<M> + 'static, M: Add<Output=M> + Zero + Copy + 'static