[Boost-users] BOOST_PROTO_EXTENDS_USING_ASSIGN

Dear all, When I compile the example right after http://beta.boost.org/doc/libs/1_45_0/doc/html/proto/users_guide.html#boost_... I get the following error in GCC 4.5.0 (MinGW32, WinXPSP2): error: ISO C++ forbids declaration of 'BOOST_PROTO_EXTENDS_USING_ASSIGN' with no type error: expected ';' before 'typedef' I first thought that that's because I haven't included the right set of headers. Replaced them all with #include and the problem remains intact. Any suggestions? TIA, --Hossein