From 6911267615ab805d555ef2b0a2458feebbc80d6d Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 19 Aug 2016 18:41:02 +0200
Subject: [PATCH] slot_tp_iter() now uses fast call

Issue #27128: slot_tp_iter() now calls _PyObject_FastCall() to avoid a
temporary empty tuple.
---
 Objects/typeobject.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 4d259275b4e..68e4f90ab6b 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -6264,16 +6264,13 @@ slot_tp_iter(PyObject *self)
                      Py_TYPE(self)->tp_name);
         return NULL;
     }
+
     if (func != NULL) {
-        PyObject *args;
-        args = res = PyTuple_New(0);
-        if (args != NULL) {
-            res = PyObject_Call(func, args, NULL);
-            Py_DECREF(args);
-        }
+        res = _PyObject_FastCall(func, NULL, 0, NULL);
         Py_DECREF(func);
         return res;
     }
+
     PyErr_Clear();
     func = lookup_method(self, &PyId___getitem__);
     if (func == NULL) {