I have done hardly any SBCL programming for some time. However, I did just finish (modulo some bad naming choices that Dan Barlow pointed out, which I still need to fix) fixing the minor problem that accidental stack overflow crashes the entire Lisp process, even in code compiled with the "safety" optimization option maximized.
Naysayers may gripe that the new checking code is pretty inefficient. I'm more than usually pleased with this change nonetheless, seeing as how the old response (for, IIRC, at least five years, going back before the CMU CL fork) would've been a Unix-level error message (e.g. "illegal instruction") and a shell prompt. Progress...
(Life? What life? Maybe next week.)
"Do not want to go through Mines of Moria, as suspect Balrog still angry about bad date we went on back in Second Age." -- The Very Secret Diary of Gandalf the Grey