structuredAttrs is enabled

trying https://github.com/1jehuang/jcode/archive/refs/tags/v0.87.0.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 23.27M   0 23.27M   0      0 18.86M      0           00:01         23.27M
100 53.51M   0 53.51M   0      0 23.90M      0           00:02         26.68M
100 81.25M   0 81.25M   0      0 25.05M      0           00:03         27.00M
100 111.5M   0 111.5M   0      0 26.26M      0           00:04         27.79M
100 131.5M   0 131.5M   0      0 25.07M      0           00:05         26.24M
100 158.7M   0 158.7M   0      0 25.40M      0           00:06         27.01M
100 172.8M   0 172.8M   0      0 23.80M      0           00:07         23.76M
100 173.9M   0 173.9M   0      0 23.56M      0           00:07         23.76M
100 173.9M   0 173.9M   0      0 23.56M      0           00:07         23.76M
100 173.9M   0 173.9M   0      0 23.56M      0           00:07         23.76M
unpacking source archive /nix/var/nix/builds/nix-43628-28891741/download.tar.gz