struct slot_become_fixup : no_fixup {
std::map<object*, object*>* become_map;
- explicit slot_become_fixup(std::map<object*, object*>* become_map_)
+ slot_become_fixup(std::map<object*, object*>* become_map_)
: become_map(become_map_) {}
object* fixup_data(object* old) {