I seem to recall around 2000 there was discussion of debuggers for Zcode and maybe Glulx akin to gdb. That is, you can trace the execution of Inform code line by line, set and clear breakpoints, and watch variables among other things. What was actually produced? The best I can come up with is something called “Inform Explorer”, but its website was last touched in 2001 and the downloads are all missing.
After I thought I fixed the HER vs HER problem reported in Inform 6.12 lib - Fatal Error, I discovered there’s more and the task of ferreting where the runtime error occurs is much more difficult than last time.