@ Py_DECREF @
identifier X;
identifier ATTR;
expression Y;
@@
- Py_DECREF(X->ATTR); X->ATTR = Y;
+ { PyObject *tmp = X->ATTR; X->ATTR = Y; Py_DECREF(tmp); }

@ Py_XDECREF @
identifier X;
identifier ATTR;
expression Y;
@@
- Py_XDECREF(X->ATTR); X->ATTR = Y;
+ { PyObject *tmp = X->ATTR; X->ATTR = Y; Py_XDECREF(tmp); }