From 638c722228940d62662f2337ed4c47c30afed37a Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 29 Jul 2008 15:35:08 +0000
Subject: make sure doctest doesn't pollute __builtins__

This was causing test_builtin to fail after the decimal doctests were run
see #3462
---
 Lib/doctest.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/doctest.py b/Lib/doctest.py
index 476c718..64a0375 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1360,6 +1360,7 @@ class DocTestRunner:
             linecache.getlines = self.save_linecache_getlines
             if clear_globs:
                 test.globs.clear()
+                __builtins__['_'] = None
 
     #/////////////////////////////////////////////////////////////////
     # Summarization
-- 
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