structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.8.3.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 23.01M   0 23.01M   0      0  8.34M      0           00:02          9.36M
unpacking source archive /nix/var/nix/builds/nix-45793-2413247189/download.tar.gz