void FileBody::Dump(std::ostream& os, const std::string& prefix) const {
  os << prefix << "<file: " << path_.u8string() << ">" << std::endl;
}
void FileBody::Dump(std::ostream& os, const std::string& prefix) const {
  os << prefix << "<file: " << path_.u8string() << ">" << std::endl;
}