# File lib/backports/1.8.7/array.rb, line 22
  def cycle(n = nil)
    return to_enum(:cycle, n) unless block_given?
    if n.nil?
      each{|e| yield e } until false
    else
      n = Backports.coerce_to_int(n)
      n.times{each{|e| yield e }}
    end
    nil
  end