From 3e412865b63d9a6ef799abcbec8b2d34eb6069c5 Mon Sep 17 00:00:00 2001
From: Michele Simionato <michele.simionato@gmail.com>
Date: Tue, 29 Mar 2011 17:34:30 +0200
Subject: Fixed a serious bug in plac doctests (raising None exceptions)

---
 plac/plac_ext.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plac/plac_ext.py b/plac/plac_ext.py
index b436d06..f58b84f 100644
--- a/plac/plac_ext.py
+++ b/plac/plac_ext.py
@@ -905,7 +905,8 @@ class Interpreter(object):
                     msg = 'line %d: input: %s\noutput: %s\nexpected: %s\n' % (
                         no + 1, input, task, output)
                     write(msg)
-                    raise task.etype, task.exc, task.tb
+                    if task.exc:
+                        raise task.etype, task.exc, task.tb
 
     def execute(self, lineiter, verbose=False):
         "Execute a lineiter of commands in a context and print the output"
-- 
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