From b4a4ef1581d249fe5e4703153fe0932681ea4d43 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 15 Nov 2023 18:24:53 +0100
Subject: [PATCH] Use PyErr_FormatUnraisable() on Python 3.13

Use the new public PyErr_FormatUnraisable() on Python 3.13.

The private _PyErr_WriteUnraisableMsg() function was removed in
Python 3.13:
https://github.com/python/cpython/pull/111643
---
 src/c/_cffi_backend.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/c/_cffi_backend.c b/src/c/_cffi_backend.c
index 76ed8f09..5e284e00 100644
--- a/src/c/_cffi_backend.c
+++ b/src/c/_cffi_backend.c
@@ -6118,7 +6118,11 @@ static void _my_PyErr_WriteUnraisable(PyObject *t, PyObject *v, PyObject *tb,
 
     PyErr_Restore(t, v, tb);
     if (s != NULL) {
+#if PY_VERSION_HEX >= 0x030D0000
+        PyErr_FormatUnraisable("Exception ignored %S", s);
+#else
         _PyErr_WriteUnraisableMsg(PyText_AS_UTF8(s), NULL);
+#endif
         Py_DECREF(s);
     }
     else