It would look something like:
<!--\nTraceback (innermost last):\n  File /usr/local/dev/zope/lib/python/ZPublisher/Publish.py, line 223, in publish_module\n  File /usr/local/dev/zope/lib/python/ZPublisher/Publish.py, line 187, in publish\n  File /usr/local/dev/zope/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook\n    (Object: Traversable)\n  File /usr/local/dev/zope/lib/python/ZPublisher/Publish.py, line 171, in publish\n  File /usr/local/dev/zope/lib/python/ZPublisher/mapply.py, line 160, in mapply\n    (Object: show)\n  File /usr/local/dev/zope/lib/python/ZPublisher/Publish.py, line 112, in call_object\n    (Object: show)\n  File /usr/local/dev/zope/lib/python/OFS/DTMLMethod.py, line 189, in __call__\n    (Object: show)\n  File /usr/local/dev/zope/lib/python/DocumentTemplate/DT_String.py, line 540, in __call__\n    (Object: show)\n  File /usr/local/dev/zope/lib/python/DocumentTemplate/DT_In.py, line 655, in renderwob\n    (Object: forums.sql.user.getMarkedReadTZ(forumid=forumid))\n  File /usr/local/dev/zope/lib/python/DocumentTemplate/DT_Util.py, line 339, in eval\n    (Object: forums.sql.user.getMarkedReadTZ(forumid=forumid))\n    (Info: forums)\n  File <string>, line 0, in ?\nNameError: (see above)\n\n-->