structuredAttrs is enabled

trying https://github.com/ctxrs/ctx/archive/refs/tags/v1.4.9.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  3.77M   0  3.77M   0      0  2.94M      0           00:01          3.63M
100  6.00M   0  6.00M   0      0  3.87M      0           00:01          3.63M
100  6.00M   0  6.00M   0      0  3.87M      0           00:01          3.63M
100  6.00M   0  6.00M   0      0  3.87M      0           00:01          3.63M
unpacking source archive /nix/var/nix/builds/nix-76087-714131038/download.tar.gz