structuredAttrs is enabled

trying https://github.com/tailscale/setec/archive/bc168fdb236279b5c5a43d14685df674d7fefb35.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  96281   0  96281   0      0 146.2k      0                              0
100  96281   0  96281   0      0 146.1k      0                              0
100  96281   0  96281   0      0 146.1k      0                              0
unpacking source archive /nix/var/nix/builds/nix-20421-3207795951/download.tar.gz