On Sun, Apr 12, 2026 at 5:12 PM Bruno Haible <[email protected]> wrote: > Hi Jim, > > > I am keenly aware. > > Good. > > > A key point is that I used it merely to understand the problem and to > > suggest solution outlines. > > Once I had that, writing the code was mostly mechanical, albeit tedious. > > Trying to understand what was the LLM's contribution and what was yours: > > - Who did make the edits to the source code files? Was that you > (with Emacs, I guess), or was it some "agent"?
I did. yes, with Emacs. > - What was the LLM's output that you made use of? Just a textual > description of what to do? Or some code snippet? I explicitly requested no code. > - Do you still have a transcript of the LLM's output, that you can > show? My terminal history saves over 30k lines, but it didn't have anything useful. Claude said it has a /history command that could help, and I tried it, but hit ENTER, accidentally clearing (that was the default in the TUI!) the history altogether. But to summarize, my prompt was to look at the current diff, which added debugging fprintf calls, and the output of running this: src/grep -E '^(.?)(.?)(.?)(.?)(.?).?\5\4\3\2\1' <<< ab I knew the problem was that prune_impossible_nodes accepted match_last=2 and set_regs failed with REG_NOMATCH, i.e., no valid reg assignment at that length, yet no fallback to match_last=1. It said something like this: The fix is to save the original state_log before pruning, then loop: on set_regs failure, find the next shorter halt state, restore and re-prune from the saved copy, and retry set_regs. BTW, I did miss an obvious additional improvement. Just pushed.
