structuredAttrs is enabled

trying https://github.com/1jehuang/jcode/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 23.12M   0 23.12M   0      0 17.45M      0           00:01         23.12M
100 53.87M   0 53.87M   0      0 23.16M      0           00:02         26.92M
100 80.27M   0 80.27M   0      0 24.13M      0           00:03         26.74M
100 101.1M   0 101.1M   0      0 23.38M      0           00:04         25.28M
100 116.2M   0 116.2M   0      0 21.82M      0           00:05         23.23M
100 131.6M   0 131.6M   0      0 20.77M      0           00:06         21.64M
100 149.0M   0 149.0M   0      0 20.29M      0           00:07         18.96M
100 166.4M   0 166.4M   0      0 19.93M      0           00:08         17.15M
100 173.8M   0 173.8M   0      0 19.79M      0           00:08         17.15M
100 173.8M   0 173.8M   0      0 19.79M      0           00:08         17.15M
100 173.8M   0 173.8M   0      0 19.79M      0           00:08         17.15M
unpacking source archive /nix/var/nix/builds/nix-392074-623117734/download.tar.gz