structuredAttrs is enabled

trying https://github.com/ctxrs/ctx/archive/refs/tags/v2.0.3.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  5.60M   0  5.60M   0      0  4.73M      0           00:01          5.57M
100  9.91M   0  9.91M   0      0  6.30M      0           00:01          5.57M
100  9.91M   0  9.91M   0      0  6.30M      0           00:01          5.57M
100  9.91M   0  9.91M   0      0  6.30M      0           00:01          5.57M
unpacking source archive /nix/var/nix/builds/nix-9990-3405205472/download.tar.gz