structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.18.0.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  9.26M   0  9.26M   0      0  6.40M      0           00:01          9.22M
100 15.75M   0 15.75M   0      0  6.36M      0           00:02          7.74M
100 22.87M   0 22.87M   0      0  6.77M      0           00:03          7.74M
100 22.87M   0 22.87M   0      0  6.77M      0           00:03          7.74M
100 22.87M   0 22.87M   0      0  6.77M      0           00:03          7.74M
unpacking source archive /nix/var/nix/builds/nix-4817-4020918153/download.tar.gz