eval_history=(no) public

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# File lib/irb/ext/history.rb, line 33
    def eval_history=(no)
      if no
        if defined?(@eval_history) && @eval_history
          @eval_history_values.size(no)
        else
          @eval_history_values = History.new(no)
          IRB.conf[:__TMP__EHV__] = @eval_history_values
          @workspace.evaluate(self, "__ = IRB.conf[:__TMP__EHV__]")
          IRB.conf.delete(:__TMP_EHV__)
        end
      else
        @eval_history_values = nil
      end
      @eval_history = no
    end
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