Handle result from PyObject_VisitManagedDict

Author: maxbachmann

include/pybind11/detail/class.h

@@ -578,7 +578,10 @@ inline PyObject *make_object_base_type(PyTypeObject *metaclass) {
 /// dynamic_attr: Allow the garbage collector to traverse the internal instance `__dict__`.
 extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
 #if PY_VERSION_HEX >= 0x030D0000
-    PyObject_VisitManagedDict(self, visit, arg);
+    int vret = PyObject_VisitManagedDict(self, visit, arg);
+    if (vret) {
+        return vret;
+    }
 #else
     PyObject *&dict = *_PyObject_GetDictPtr(self);
     Py_VISIT(dict);