structuredAttrs is enabled

trying https://github.com/marcus/sidecar/archive/refs/tags/v1.15.1.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
  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 12.85M   0 12.85M   0      0 10.34M      0           00:01         12.82M
100 24.09M   0 24.09M   0      0 10.66M      0           00:02         11.93M
100 43.30M   0 43.30M   0      0 14.36M      0           00:03         11.93M
100 43.30M   0 43.30M   0      0 14.36M      0           00:03         11.93M
100 43.30M   0 43.30M   0      0 14.36M      0           00:03         11.93M
unpacking source archive /nix/var/nix/builds/nix-107-3179511101/download.tar.gz