id summary reporter owner description type status milestone component version severity resolution keywords cc 9964 broken move semantics of fusion::map Alexander Cheparukhin Joel de Guzman move constructor of map_impl is broken since 1.55: the base class is trying to construct from itself instead of the passed argument, which results in errors. I've attached a patch which should solve the problem. Bugs closed To Be Determined fusion Boost 1.55.0 Regression fixed