structuredAttrs is enabled

trying https://github.com/herdrdev/herdr/archive/refs/tags/v0.9.1.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
  0      0   0      0   0      0      0      0                              0
  0      0   0      0   0      0      0      0                              0

  0      0   0      0   0      0      0      0                              0
100  7.00M   0  7.00M   0      0  5.86M      0           00:01          6.94M
100  9.22M   0  9.22M   0      0  6.44M      0           00:01          6.94M
100  9.22M   0  9.22M   0      0  6.44M      0           00:01          6.94M
100  9.22M   0  9.22M   0      0  6.44M      0           00:01          6.94M
unpacking source archive /nix/var/nix/builds/nix-38062-2477905384/download.tar.gz