save_history=(val) public

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# File lib/irb/ext/save-history.rb, line 32
    def save_history=(val)
      IRB.conf[:SAVE_HISTORY] = val
      if val
        main_context = IRB.conf[:MAIN_CONTEXT]
        main_context = self unless main_context
        main_context.init_save_history
      end
    end
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