From 7ca627589f1c5a89cc97b4434a1eb5c7f5690c8f Mon Sep 17 00:00:00 2001
From: Tres Seaver <tseaver@palladion.com>
Date: Fri, 6 Sep 2024 12:00:19 -0400
Subject: [PATCH] fix: more expliit weakref clearance

---
 src/zope/interface/_zope_interface_coptimizations.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/zope/interface/_zope_interface_coptimizations.c b/src/zope/interface/_zope_interface_coptimizations.c
index 8340141a..1046b665 100644
--- a/src/zope/interface/_zope_interface_coptimizations.c
+++ b/src/zope/interface/_zope_interface_coptimizations.c
@@ -467,6 +467,7 @@ static void
 OSD_dealloc(PyObject* self)
 {
     PyObject_GC_UnTrack(self);
+    PyObject_ClearWeakRefs(OBJECT(self));
     PyTypeObject *tp = Py_TYPE(self);
     tp->tp_free(OBJECT(self));
     Py_DECREF(tp);
@@ -1123,6 +1124,7 @@ static void
 LB_dealloc(LB* self)
 {
     PyObject_GC_UnTrack((PyObject*)self);
+    PyObject_ClearWeakRefs(OBJECT(self));
     PyTypeObject* tp = Py_TYPE(self);
     LB_clear(self);
     tp->tp_free((PyObject*)self);
@@ -1710,6 +1712,7 @@ static void
 VB_dealloc(VB* self)
 {
     PyObject_GC_UnTrack((PyObject*)self);
+    PyObject_ClearWeakRefs(OBJECT(self));
     PyTypeObject *tp = Py_TYPE(self);
     VB_clear(self);
     tp->tp_free((PyObject*)self);