Backport from trunk:

property_traverse() should also traverse into prop_doc -- there's no
typecheck that guarantees it's a string, and BTW string subclasses
could hide references.

diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index e7aa4ec178598956d28fc63104095a1881fa881d..614cb40ba5c6768e4e8d56481e0967b9b597267f 100644 (file)
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -1061,6 +1061,7 @@ property_traverse(PyObject *self, visitproc visit, void *arg)
        VISIT(prop_get);
        VISIT(prop_set);
        VISIT(prop_del);
+       VISIT(prop_doc);
 
        return 0;
 }