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diff --git a/ext/ply/test/lex_re2.exp b/ext/ply/test/lex_re2.exp
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+lex: Regular expression for rule 't_PLUS' matches empty string.
+Traceback (most recent call last):
+ File "./lex_re2.py", line 25, in <module>
+ lex.lex()
+ File "../ply/lex.py", line 759, in lex
+ raise SyntaxError,"lex: Unable to build lexer."
+SyntaxError: lex: Unable to build lexer.