structuredAttrs is enabled

trying https://github.com/yvgude/lean-ctx/archive/refs/tags/v3.10.4.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  7.54M   0  7.54M   0      0  6.32M      0           00:01          7.50M
100 16.75M   0 16.75M   0      0  7.63M      0           00:02          8.35M
100 17.05M   0 17.05M   0      0  7.73M      0           00:02          8.35M
100 17.05M   0 17.05M   0      0  7.73M      0           00:02          8.35M
100 17.05M   0 17.05M   0      0  7.72M      0           00:02          8.35M
unpacking source archive /nix/var/nix/builds/nix-50566-28764201/download.tar.gz