id summary reporter owner description type status milestone component version severity resolution keywords cc 10041 [variant] make_variant_over requires Front Extensible Sequence o0o0@… Antony Polukhin "When trying to compile {{{ typedef boost::mpl::set2< std::string, int > types; boost::make_variant_over< types >::type v1; }}} MPL compile-time assertion notifies about missing push_front specialization. At least documentation should be refined. Now is says ''Sequence is any type fulfilling the requirements of MPL's Sequence concept''. But probably code may be changed for more general solution." Bugs closed Boost 1.65.0 variant Boost 1.55.0 Problem fixed