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There is a similar project called geordi-prime, it's a haskell-based c++ eval irc bot. The only difference is that it cannot keep state. Anyway, it's publicly available on freenode irc (and countless copies are available elsewhere) and it seems its safety measures are more than enough for irc wannabe hackers. The web-based cling could use the same idea to make sure its safe.

The webpage of geordi-prime: http://www.eelis.net/geordi/