--- pyparsing_py3.py.orig	2013-04-03 01:28:01.927400414 +0200

+++ pyparsing_py3.py	2013-04-03 01:28:23.903443448 +0200

@@ -891,7 +891,7 @@

                 ParserElement._exprArgCache[ lookup ] = (value[0],value[1].copy())

                 return value

             except ParseBaseException as pe:

-                exc.__traceback__ = None

+                pe.__traceback__ = None

                 ParserElement._exprArgCache[ lookup ] = pe

                 raise