ext/ply/test/lex_ignore.exp

   1 ./lex_ignore.py:20: Rule 't_ignore' must be defined as a string.
   2 Traceback (most recent call last):
   3   File "./lex_ignore.py", line 29, in <module>
   4     lex.lex()
   5   File "../ply/lex.py", line 759, in lex
   6     raise SyntaxError,"lex: Unable to build lexer."
   7 SyntaxError: lex: Unable to build lexer.