id summary reporter owner description type status milestone component version severity resolution keywords cc 8759 fusion::map doesn't specialize extension::convert_impl when compiled as C++11 Eric Niebler Joel de Guzman Looks like a simple oversight. I'm attaching a patch that looks right to me, but I haven't really tested it. I also haven't looked around for other missing convert_impl specializations. Bugs closed To Be Determined fusion Boost 1.54.0 Problem fixed