structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.15.0.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  8.75M   0  8.75M   0      0  6.97M      0           00:01          8.65M
100 15.76M   0 15.76M   0      0  6.88M      0           00:02          7.70M
100 20.86M   0 20.86M   0      0  6.92M      0           00:03          7.70M
100 20.86M   0 20.86M   0      0  6.92M      0           00:03          7.70M
100 20.86M   0 20.86M   0      0  6.92M      0           00:03          7.70M
unpacking source archive /nix/var/nix/builds/nix-80032-1043549344/download.tar.gz