structuredAttrs is enabled

trying https://github.com/backnotprop/plannotator/archive/refs/tags/v0.27.18.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  7.62M   0  7.62M   0      0  6.17M      0           00:01          7.43M
100 38.00M   0 38.00M   0      0 16.76M      0           00:02         18.47M
100 58.50M   0 58.50M   0      0 20.21M      0           00:02         18.47M
100 58.50M   0 58.50M   0      0 20.21M      0           00:02         18.47M
100 58.50M   0 58.50M   0      0 20.21M      0           00:02         18.47M
unpacking source archive /nix/var/nix/builds/nix-80812-1609109569/download.tar.gz