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I'm writing a C extension module and discovered that Py_CLEAR() causes a
crash if the programmer happened to name their variable "tmp". The
Py_CLEAR() macro internally uses the name "tmp" in a new scope, hiding
the callers "tmp", and calling Py_DECREF() on an essentially random bit
of memory.
I suggest changing Py_CLEAR() to use something a little less common than
"tmp". Perhaps "_py_tmp".
For easy reference, here's how Py_CLEAR() is defined now:
#define Py_CLEAR(op)				\
 do { 	\
 if (op) {			\
 PyObject *tmp = (PyObject *)(op);	\
 (op) = NULL;		\
 Py_DECREF(tmp);		\
 }				\
 } while (0)