10. [Optional feature] Conditions and restarts as in Common Lisp:
http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html

Probably need continuations for this. Maybe could simulate it with coroutines.

This doesn't actually need continuations or coroutines - in fact, it's quite simple to do on the JVM using exceptions - as long as you have a way of executing code in other dynamic contexts - which is much simpler in a dynamic language. It does however require a runtime library (or full-program weaving).

Cheers
--
 Ola Bini (http://olabini.com)
  Ioke - JRuby - ThoughtWorks

 "Yields falsehood when quined" yields falsehood when quined.

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