Index: Lib/doctest.py
===================================================================
--- Lib/doctest.py	(revision 76221)
+++ Lib/doctest.py	(working copy)
@@ -2634,4 +2634,6 @@
     return 0
 
 if __name__ == "__main__":
-    sys.exit(_test())
+    # XXX: Tests fail if imported as __main__
+    import doctest
+    sys.exit(doctest._test())