Issue #22570: Renamed Py_SETREF to Py_XSETREF.
diff --git a/Modules/_json.c b/Modules/_json.c
index fede6b1..9c8f66c 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1717,7 +1717,7 @@
     }
     else if (PyUnicode_Check(s->encoding)) {
         PyObject *tmp = PyUnicode_AsEncodedString(s->encoding, NULL, NULL);
-        Py_SETREF(s->encoding, tmp);
+        Py_XSETREF(s->encoding, tmp);
     }
     if (s->encoding == NULL)
         goto bail;