structuredAttrs is enabled

trying https://github.com/lambda-symbolics/cl-skills/archive/a34b85a3aabca9530c5f9772ea988a6399a57963.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  23348   0  23348   0      0  51453      0                              0
100  23348   0  23348   0      0  51450      0                              0
100  23348   0  23348   0      0  51445      0                              0
unpacking source archive /nix/var/nix/builds/nix-75431-3398534417/download.tar.gz