load_history() public

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# File lib/irb/ext/save-history.rb, line 72
    def load_history
      if history_file = IRB.conf[:HISTORY_FILE]
        history_file = File.expand_path(history_file)
      end
      history_file = IRB.rc_file("_history") unless history_file
      if File.exist?(history_file)
        open(history_file) do |f|
          f.each {|l| HISTORY << l.chomp}
        end
      end
    end
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