From f9f00495a3f0ef6037c215c42bd2d919590ff11f Mon Sep 17 00:00:00 2001
From: Aaron Gokaslan <skylion.aaron@gmail.com>
Date: Sun, 10 Jul 2022 00:43:53 -0400
Subject: [PATCH] Properly visit self in >=3.9 traverse (#4051)

* Properly visit self in >=3.9 traverse

* Add comment about 3.9 behavior
---
 include/pybind11/detail/class.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/pybind11/detail/class.h b/include/pybind11/detail/class.h
index c09f70ef0..42720f844 100644
--- a/include/pybind11/detail/class.h
+++ b/include/pybind11/detail/class.h
@@ -531,6 +531,10 @@ extern "C" inline int pybind11_set_dict(PyObject *self, PyObject *new_dict, void
 extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
     PyObject *&dict = *_PyObject_GetDictPtr(self);
     Py_VISIT(dict);
+// https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_traverse
+#if PY_VERSION_HEX >= 0x03090000
+    Py_VISIT(Py_TYPE(self));
+#endif
     return 0;
 }