static int
$abbrev$_traverse($abbrev$$object$ *self, visitproc visit, void *arg)
{
	/* For each subobject that could be involved in cycles, do
	   code like:

	if (self->xxx != NULL && visit(self->xxx, arg) < 0)
		return -1;
	*/

	return 0;
}

static int
$abbrev$_clear($abbrev$$object$ *self)
{
	/* XXXX Drop references that may have created reference
           cycles. Immutable objects do not have to define this method
           since they can never directly create reference cycles. Note
           that the object must still be valid after calling this
           method (don't just call Py_DECREF() on a reference). The
           collector will call this method if it detects that this
           object is involved in a reference cycle.
        */
	return 0;
}