structuredAttrs is enabled

trying https://github.com/kdlbs/kandev/archive/refs/tags/v0.95.0.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
  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  5.51M   0  5.51M   0      0  4.30M      0           00:01          5.49M
100 12.76M   0 12.76M   0      0  5.56M      0           00:02          6.33M
100 20.75M   0 20.75M   0      0  6.27M      0           00:03          6.84M
100 28.75M   0 28.75M   0      0  6.62M      0           00:04          7.08M
100 49.26M   0 49.26M   0      0  9.22M      0           00:05          9.73M
100 59.28M   0 59.28M   0      0  9.60M      0           00:06          9.73M
100 59.28M   0 59.28M   0      0  9.60M      0           00:06          9.73M
100 59.28M   0 59.28M   0      0  9.60M      0           00:06          9.73M
unpacking source archive /nix/var/nix/builds/nix-32117-1151447845/download.tar.gz