structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.8.1.tar.gz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100 22.92M   0 22.92M   0      0  7.86M      0           00:02          9.20M
unpacking source archive /nix/var/nix/builds/nix-94293-4011794485/download.tar.gz