structuredAttrs is enabled

trying https://github.com/activeing123/mcptoon/archive/refs/tags/v0.8.12.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  7.71M   0  7.71M   0      0  6.17M      0           00:01          7.69M
100 12.12M   0 12.12M   0      0  5.37M      0           00:02          6.04M
100 13.66M   0 13.66M   0      0  5.34M      0           00:02          6.04M
100 13.66M   0 13.66M   0      0  5.34M      0           00:02          6.04M
100 13.66M   0 13.66M   0      0  5.34M      0           00:02          6.04M
unpacking source archive /nix/var/nix/builds/nix-77426-350678217/download.tar.gz