From 4e8ea4e853efeca6782e905a75f83a5e704a5fb0 Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Sat, 14 Nov 2015 22:14:32 +0000
Subject: [PATCH] Python SystemError fix with -builtin

Fix error when append on a SWIG Object with -builtin:

  x.append(10)
  SystemError: error return without exception set

Having append and next methods on a SWIG object by default doesn't seem
right to me though.
---
 Lib/python/pyrun.swg | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/python/pyrun.swg b/Lib/python/pyrun.swg
index 5eedca483..d43b75202 100644
--- a/Lib/python/pyrun.swg
+++ b/Lib/python/pyrun.swg
@@ -569,6 +569,7 @@ SwigPyObject_append(PyObject* v, PyObject* next)
   next = tmp;
 #endif
   if (!SwigPyObject_Check(next)) {
+    PyErr_SetString(PyExc_TypeError, "Attempt to append a non SwigPyObject");
     return NULL;
   }
   sobj->next = next;