I appreciate the fast responses. I'm using the OpenBSD precompiled packages, so I don't have any of the source to do in-depth testing with. Since I'm using an OpenBSD a few versions behind, and under MIPS64el, and the other messages seem to indicate this can't be reproduced, I'll merely keep this in mind if I experience the same after upgrading.
My issue with ⎕STOP is primarily how to continue after it does its work; I was reluctant to continue testing to see how to do anything other than evaluate expressions showing the state, as this crashed GNU APL. After taking a break from this, I decided to try using right arrow to restart control flow and this worked, but is this the preferred method for resuming control flow with ⎕STOP? There have been other crashes or queer things I've seen and merely never reported, note, and I often merely attributed these to my particular environment, but I'll try to do better with reporting these in the future; I appreciate the help I've received and I'll try to let you know if I continue seeing it once I upgrade and all of that.
