Hello, The following code doesn't compile (MSVC10, Boost 1.55). If I modify "catch_all" line like this: query = id[phx::try_[qi::_val = phx::bind(&string2test, qi::_1)].catch_all [ qi::_pass = false ], qi::_val = qi::_val ]; ...it compiles, but doesn't seem to invoke the semantic action in runtime. It there a workaround that would both compile and work? Thanks! #define BOOST_SPIRIT_USE_PHOENIX_V3 #include <string> #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix_core.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/phoenix/bind/bind_function.hpp> #include <boost/phoenix/statement/try_catch.hpp> namespace qi = boost::spirit::qi; namespace phx = boost::phoenix; struct test { }; test string2test(const std::string &str) { if (str == "throw") throw "exception!"; return test(); } template <typename Iterator = std::string::const_iterator> struct test_parser : qi::grammar<Iterator, test(), qi::blank_type> { test_parser() : test_parser::base_type(query) { query = id[phx::try_[qi::_val = phx::bind(&string2test, qi::_1)].catch_all [ qi::_pass = false ] ]; id = qi::lexeme[*qi::char_("a-zA-Z_0-9")]; } qi::rule<Iterator, test(), qi::blank_type> query; qi::rule<Iterator, std::string(), qi::blank_type> id; }; int main() { const std::string input = "qwerty"; test_parser<> p; test output; bool ok = phrase_parse(input.begin(), input.end(), p, qi::blank, output); } // 1> boost\boost\proto\traits.hpp(297): error C2338: 0 == Expr::proto_arity_c 1> boost\boost\mpl\eval_if.hpp(63) : see reference to class template instantiation 'boost::proto::result_of::value<Expr>' being compiled 1> with 1> [ 1> Expr=boost::phoenix::try_catch_actor<boost::proto::exprns_::basic_expr<boost::phoenix::tag::try_catch,boost::proto::argsns_::list2<boost::phoenix::try_catch_actor<boost::proto::exprns_::basic_expr<boost::phoenix::tag::try_catch,boost::proto::argsns_::list1<boost::phoenix::actor<boost::proto::exprns_::expr<boost::proto::tagns_::tag::assign,boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::spirit::attribute<0>>,0>,boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval,boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::phoenix::detail::function_ptr<1,test,test (__cdecl *)(const std::string &)>>,0>,boost::phoenix::actor<boost::spirit::argument<0>>>,2>>>,2>>>,1>>,boost::proto::exprns_::basic_expr<boost::phoenix::tag::catch_all,boost::proto::argsns_::list1<boost::phoenix::actor<boost::proto::exprns_::expr<boost::proto::tagns_::tag::assign,boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<boost::phoenix::argument<3>>,0>,boost::phoenix::actor<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::proto::argsns_::term<bool>,0>>>,2>>>,1>>,2>> 1> ]