repl.rb

def safe_eval(text)
  begin
    Kernel.eval(text)
  rescue Exception => e
    "Exception " + e.to_s
  rescue SyntaxError => e
    "Syntax Error #{e}"
  rescue Error => e
    "Error #{e}"
  rescue NameError => e #"multicast" nameerror, so inventory can caputre it
    "NameError #{e}"
  end
end

while true
  something = gets.strip
  safe_eval something
end