Gregory P. Smith added the comment: We no longer describe the contents of PyObject in the docs so mentioning Py_TRACE_REFS does not seem worth it as that just changes Py_HEAD_EXTRA which adds the doubly linked list to PyObject (today). Py_TRACE_REFS isn't useful for anyone to know about IMNSHO as it's a compile time define that normally comes from choosing to do a pydebug build. (I believe we have or have at least had bugs in our code where Py_TRACE_REFS won't work if Py_DEBUG is not also defined as we never test in such a mixed non-DEBUG but with TRACE_REFS configuration) ---------- resolution: -> fixed stage: -> commit review status: open -> closed versions: +Python 3.4, Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue9014> _______________________________________