CPython has many C extensions with non-trivial PyInit_xxx() functions which has to handle failures. A few modules use "Py_DECREF(m); retutrn NULL;", but most functions only do "return NULL;". Is it a reference leak or not?
Example from Modules/posixmodule.c:
v = convertenviron(); Py_XINCREF(v); if (v == NULL || PyModule_AddObject(m, "environ", v) != 0) return NULL; Py_DECREF(v);
Does this code leak a reference on m? ... Oh, and maybe also leaks a reference on v?