> Scheme, a Lisp-like language, allows some evaluable expressions to have an "undefined" or "unspecified" result value. That's why they are heretics !! (Just

> Scheme, a Lisp-like language, allows some evaluable expressions to have an "undefined" or "unspecified" result value. That's why they are heretics !! (Just joking of course... Scheme is the other great Lisp dialect.)