Hi all, I've taken /F's C implementation of the standard class-based exceptions, implemented the stuff he left out, proofread for reference counting issues, hacked a bit more, and integrated it with the 1.6 interpreter. Everything seems to work well; i.e. the regression test suite passes and I don't get any core dumps ;). I don't have the ability right now to Purify things[1], but I've tried to be very careful in handling reference counting. Since I've been hacking on this all day, it could definitely use another set of eyes. I think rather than email a huge patch kit, I'll just go ahead and check the changes in. Please take a look and give it a hard twist. Thanks to /F for the excellent head start! -Barry [1] Purify was one of the coolest products on Solaris, but alas it doesn't seem like they'll ever support Linux. What do you all use to do similar memory verification tests on Linux? Or do you just not?