# File lib/optparse.rb, line 966
  def summarize(to = [], width = @summary_width, max = width - 1, indent = @summary_indent, &blk)
    blk ||= proc {|l| to << (l.index($/, -1) ? l : l + $/)}
    visit(:summarize, {}, {}, width, max, indent, &blk)
    to
  end