structuredAttrs is enabled

trying https://github.com/activeing123/mcptoon/archive/refs/tags/v0.7.20.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 10.06M   0 10.06M   0      0  8.49M      0           00:01         10.06M
100 13.02M   0 13.02M   0      0 10.09M      0           00:01         10.06M
100 13.02M   0 13.02M   0      0 10.09M      0           00:01         10.06M
100 13.02M   0 13.02M   0      0 10.09M      0           00:01         10.06M
unpacking source archive /nix/var/nix/builds/nix-37477-4053271053/download.tar.gz