throwstd::runtime_error{fmt::format("ranks {}&{} have to contain identical sets of registered observables. But they contain different amounts of observables! {} != {}.",target_rank,rank,obscount,observables_.size())};
throwstd::runtime_error{fmt::format(
"ranks {}&{} have to contain identical sets of registered observables. But "
"they contain different amounts of observables! {} != {}.",
throwstd::runtime_error{fmt::format("ranks {}&{} have to contain identical sets of registered observables. Found '{}' != '{}'.",target_rank,rank,name,std::string{buf.data()})};
throwstd::runtime_error{
fmt::format("ranks {}&{} have to contain identical sets of registered "