From: Benjamin Peterson <benjamin@python.org>
Date: Thu, 2 Jun 2016 18:35:59 +0000 (-0700)
Subject: note that Py_VISIT handles NULL (closes #27183)
X-Git-Tag: v3.5.2rc1~87
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a49ccf2113085f74f4ce6a84c19f2aaaff9f5978;p=thirdparty%2FPython%2Fcpython.git

note that Py_VISIT handles NULL (closes #27183)
---

diff --git a/Doc/c-api/gcsupport.rst b/Doc/c-api/gcsupport.rst
index 9f6ad8522609..f5e0d7ec9c79 100644
--- a/Doc/c-api/gcsupport.rst
+++ b/Doc/c-api/gcsupport.rst
@@ -126,9 +126,10 @@ must name its arguments exactly *visit* and *arg*:
 
 .. c:function:: void Py_VISIT(PyObject *o)
 
-   Call the *visit* callback, with arguments *o* and *arg*. If *visit* returns
-   a non-zero value, then return it.  Using this macro, :c:member:`~PyTypeObject.tp_traverse`
-   handlers look like::
+   If *o* is not *NULL*, call the *visit* callback, with arguments *o*
+   and *arg*.  If *visit* returns a non-zero value, then return it.
+   Using this macro, :c:member:`~PyTypeObject.tp_traverse` handlers
+   look like::
 
       static int
       my_traverse(Noddy *self, visitproc visit, void *arg)