We have to actually invoke ranges::to<>

src/dds/repo/repo.cpp

 fs::path repository::default_local_path() noexcept { return dds_data_dir() / "repo"; }
 
 repository repository::_open_for_directory(bool writeable, path_ref dirpath) {
-    auto dist_dir = dirpath;
-    auto entries  = load_sdists(dirpath) | to<sdist_set>;
+    sdist_set entries  =  load_sdists(dirpath) | to<sdist_set>();
     return {writeable, dirpath, std::move(entries)};
 }