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 #include #include #include #include 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 { 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 query; qi::rule 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>,0>,boost::phoenix::actor>,0>,boost::phoenix::actor>>,2>>>,2>>>,1>>,boost::proto::exprns_::basic_expr>,0>,boost::phoenix::actor>>,2>>>,1>>,2>> 1> ]