DeterminedFOX

eval: ->a{
    code = a
    class ChatbotEval
        def self.safeEval code
            Thread.kill $mthread
            $mthread = Thread.new {
                $SAFE = 4
                result = begin
                             eval code
                         rescue Exception => e
                             "Error in eval: #{e}"
                         end
                Thread.current[:evalResult] = result
            }
            Thread.new { sleep 3; Thread.kill $mthread }
            $mthread.join