Interesting abuse of the Lisp Condition system. If you'd like to read more, an excellent introduction to the Common Lisp condition system is given in Practical

Interesting abuse of the Lisp Condition system. If you'd like to read more, an excellent introduction to the Common Lisp condition system is given in Practical Common Lisp: http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html http://www.gigamonkeys.com/book/beyond-exception-handling-co... And I wrote a tutorial on Common Lisp restarts, using them in a non-trivial real world example: http://chaitanyagupta.com/lisp/restarts.html http://chaitanyagupta.com/lisp/restarts.html