structuredAttrs is enabled

trying https://github.com/yvgude/lean-ctx/archive/refs/tags/v3.10.2.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  9.50M   0  9.50M   0      0  7.59M      0           00:01          9.45M
100 16.88M   0 16.88M   0      0  7.86M      0           00:02          9.45M
100 16.88M   0 16.88M   0      0  7.86M      0           00:02          9.45M
100 16.88M   0 16.88M   0      0  7.86M      0           00:02          9.45M
unpacking source archive /nix/var/nix/builds/nix-47765-657092106/download.tar.gz