A small change to the C API for weakly-referencable types: Such types

must now initialize the extra field used by the weak-ref machinery to
NULL themselves, to avoid having to require PyObject_INIT() to check
if the type supports weak references and do it there.  This causes less
work to be done for all objects (the type object does not need to be
consulted to check for the Py_TPFLAGS_HAVE_WEAKREFS bit).

1 files changed, 1 insertions, 0 deletions

diff --git a/Objects/classobject.c b/Objects/classobject.c
index 00cfdde627..d7b4c1e5a6 100644
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -453,6 +453,7 @@ PyInstance_NewRaw(PyObject *klass, PyObject *dict)
 		Py_DECREF(dict);
 		return NULL;
 	}
+	inst->in_weakreflist = NULL;
 	Py_INCREF(klass);
 	inst->in_class = (PyClassObject *)klass;
 	inst->in_dict = dict;