structuredAttrs is enabled

trying https://github.com/koxudaxi/datamodel-code-generator/archive/refs/tags/0.52.1.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
100  1.28M   0  1.28M   0      0  1.84M      0                              0
unpacking source archive /nix/var/nix/builds/nix-53937-1549707077/download.tar.gz