id summary reporter owner description type status milestone component version severity resolution keywords cc 6641 boost::spirit::qi rule parsing bug Bobby Paulose Joel de Guzman "gives compile error since 1.47.0 to 1.49.0 Worked fine in 1.46.1 boost::spirit::qi::lexeme[ ( char_('b') >> *(char_('a') | (char_('b') >> char_('c'))) ) ]; " Bugs closed Boost 1.50.0 spirit Boost 1.49.0 Regression invalid qi rule parsing