class Chronic::RepeaterYear

def next(pointer)
  super
  if !@current_year_start
    case pointer
    when :future
      @current_year_start = Chronic.construct(@now.year + 1)
    when :past
      @current_year_start = Chronic.construct(@now.year - 1)
    end
  else
    diff = pointer == :future ? 1 : -1
    @current_year_start = Chronic.construct(@current_year_start.year + diff)
  end
  Span.new(@current_year_start, Chronic.construct(@current_year_start.year + 1))
end