docs: def _consolidate_slices(slices):
      """Consolidate adjacent slices in a list of slices.
      """
      result = []
      last_slice = slice(None)
      for slice_ in slices:
          if not isinstance(slice_, slice):
              raise ValueError('list element is not a slice: %r' % slice_)
          if (result and last_slice.stop == slice_.start and
                  _is_one_or_none(last_slice.step) and
                  _is_one_or_none(slice_.step)):
              last_slice = slice(last_slice.start, slice_.stop, slice_.step)
              result[-1] = last_slice
          else:
              result.append(slice_)
              last_slice = slice_
      return result