structuredAttrs is enabled

trying https://github.com/kdlbs/kandev/archive/refs/tags/v0.95.1.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  5.50M   0  5.50M   0      0  4.43M      0           00:01          5.42M
100 12.50M   0 12.50M   0      0  5.55M      0           00:02          6.18M
100 20.76M   0 20.76M   0      0  6.33M      0           00:03          6.81M
100 28.54M   0 28.54M   0      0  6.67M      0           00:04          7.05M
100 46.00M   0 46.00M   0      0  8.71M      0           00:05          9.10M
100 60.29M   0 60.29M   0      0  9.60M      0           00:06          9.10M
100 60.29M   0 60.29M   0      0  9.60M      0           00:06          9.10M
100 60.29M   0 60.29M   0      0  9.60M      0           00:06          9.10M
unpacking source archive /nix/var/nix/builds/nix-86587-490290122/download.tar.gz