269   auto current = guard_map.begin();  in mergeGuards()  local
270   auto next = current;  in mergeGuards()
274     if (current->second != next->second) {  in mergeGuards()
275       ++current;  in mergeGuards()
284     FileLocation current_location = current->first.end;  in mergeGuards()
359       D("Not merging blocks %s and %s\n", to_string(current->first).c_str(),  in mergeGuards()
361       ++current;  in mergeGuards()
366     D("Merging blocks %s and %s\n", to_string(current->first).c_str(),  in mergeGuards()
369     Location merged = current->first;  in mergeGuards()
372     DeclarationAvailability avail = current->second;  in mergeGuards()
374     guard_map.erase(current);  in mergeGuards()
377     std::tie(current, unused) = guard_map.insert(std::make_pair(merged, avail));  in mergeGuards()
378     next = current;  in mergeGuards()