structuredAttrs is enabled

trying https://github.com/numtide/claudebox/archive/v0.2.0.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   8490   0   8490   0      0  19799      0                              0
unpacking source archive /nix/var/nix/builds/nix-28751-2482866879/download.tar.gz