From 19a23746b0d2162fbcb6286949137d0874d90ce1 Mon Sep 17 00:00:00 2001
From: Armin Ronacher <armin.ronacher@active-4.com>
Date: Mon, 29 Nov 2010 12:14:50 +0100
Subject: We cannot fake the descriptor on a tproxy so we have to set _tb_next
 directly

---
 jinja2/debug.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/jinja2/debug.py b/jinja2/debug.py
index e8492cd..80ee2e7 100644
--- a/jinja2/debug.py
+++ b/jinja2/debug.py
@@ -80,9 +80,9 @@ class ProcessedTraceback(object):
         prev_tb = None
         for tb in self.frames:
             if prev_tb is not None:
-                prev_tb.tb_next = tb
+                prev_tb._tb_next = tb
             prev_tb = tb
-        prev_tb.tb_next = None
+        prev_tb._tb_next = None
 
     def render_as_text(self, limit=None):
         """Return a string with the traceback."""
-- 
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