On Fri, 13 Jan 2006 15:48:29 +0000, Jonathon McKitrick <jcm at FreeBSD-uk.eu.org> wrote: > But doesn't that require an exception or an error to break into the > debugger? If you are trying to track down a logic error, what > approach can you use? There's also BREAK: <http://www.lispworks.com/documentation/HyperSpec/Body/f_break.htm>