structuredAttrs is enabled

trying https://github.com/yvgude/lean-ctx/archive/refs/tags/v3.10.3.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
  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  7.28M   0  7.28M   0      0  5.91M      0           00:01          7.28M
100 15.77M   0 15.77M   0      0  7.01M      0           00:02          7.82M
100 17.04M   0 17.04M   0      0  7.15M      0           00:02          7.82M
100 17.04M   0 17.04M   0      0  7.15M      0           00:02          7.82M
100 17.04M   0 17.04M   0      0  7.15M      0           00:02          7.82M
unpacking source archive /nix/var/nix/builds/nix-44202-121459636/download.tar.gz