[Im re-sending as the attachment caused this to be held up for administrative approval. Ive forwarded the attachement to Chris - anyone else just mail me for it] Ive struck a crash in the new trashcan mechanism (so I guess Chris is gunna pay the most attention here). Although I can only provoke this reliably in debug builds, I believe it also exists in release builds, but is just far more insidious. Unfortunately, I also can not create a simple crash case. But I _can_ provide info on how you can reliably cause the crash. Obviously only tested on Windows... * Go to http://lima.mudlib.org/~rassilon/p2c/, and grab the download, and unzip. * Replace "transformer.py" with the attached version (multi-arg append bites :-) * Ensure you have a Windows "debug" build available, built from CVS. * From the p2c directory, Run "python_d.exe gencode.py gencode.py" You will get a crash, and the debugger will show you are destructing a list, with an invalid object. The crash occurs about 1000 times after this code is first hit, and I can't narrow the crash condition down :-( If you open object.h, and disable the trashcan mechanism (by changing the "xx", as the comments suggest) then it runs fine. Hope this helps someone - Im afraid I havent a clue :-( Mark.