Issue 2235: __hash__ is once again inherited by default, but inheritance can be blocked explicitly so that collections.Hashable remains meaningful
diff --git a/Include/object.h b/Include/object.h
index e447769..c00df74 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -475,6 +475,7 @@
PyAPI_FUNC(int) PyObject_GenericSetAttr(PyObject *,
PyObject *, PyObject *);
PyAPI_FUNC(long) PyObject_Hash(PyObject *);
+PyAPI_FUNC(long) PyObject_HashNotImplemented(PyObject *);
PyAPI_FUNC(int) PyObject_IsTrue(PyObject *);
PyAPI_FUNC(int) PyObject_Not(PyObject *);
PyAPI_FUNC(int) PyCallable_Check(PyObject *);