One of the major problems with Emacs is that it's hard to isolate, debug, and rollback Elisp fragments; the only way to fix many problems is to restart Emacs. I

One of the major problems with Emacs is that it's hard to isolate, debug, and rollback Elisp fragments; the only way to fix many problems is to restart Emacs. I still haven't figured out how to solve this problem with Rhine: keep (limited) history for all variables? How do we keep track of the effect of specific function callchains?