Hi, I'm trying to compile some code that uses Boost with a GCC 4.9 snapshot, but something seems to be going badly wrong. Something as simple as a file containing the include: #include fails to compile, with the following errors: In file included from boost/proto/matches.hpp:42:0,                  from boost/phoenix/core/domain.hpp:12,                  from boost/phoenix/core/actor.hpp:17,                  from boost/phoenix/core.hpp:15,                  from test.cpp:1: boost/proto/traits.hpp: In instantiation of 'struct boost::proto::tag_ofboost::proto::_': boost/phoenix/core/domain.hpp:25:18:   required from here boost/proto/traits.hpp:241:42: error: no type named 'proto_tag' in 'struct boost::proto::_'          typedef typename Expr::proto_tag type;                                           ^ In file included from boost/phoenix/core/argument.hpp:15:0,                  from boost/phoenix/core.hpp:17,                  from test.cpp:1: boost/phoenix/core/terminal.hpp: In instantiation of 'struct boost::phoenix::detail::placeholder_idxboost::proto::_value()> >': boost/phoenix/core/terminal.hpp:122:18:   required from here boost/phoenix/core/terminal.hpp:115:16: error: 'value' is not a member of 'boost::proto::makeboost::proto::_value()>'          struct placeholder_idx                 ^ The exact same code compiles fine with GCC 4.8 and earlier. Any ideas as to what might be going wrong? Thanks, Nate