structuredAttrs is enabled

trying https://github.com/1jehuang/jcode/archive/refs/tags/v0.85.0.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
 14 173.7M  14 24.94M   0      0 20.07M      0   00:08   00:01   00:07 24.19M
 31 173.7M  31 55.03M   0      0 24.53M      0   00:07   00:02   00:05 27.08M
 49 173.7M  49 85.75M   0      0 26.41M      0   00:06   00:03   00:03 28.25M
 67 173.7M  67 116.7M   0      0 27.47M      0   00:06   00:04   00:02 28.91M
 84 173.7M  84 147.4M   0      0 28.07M      0   00:06   00:05   00:01 29.24M
100 173.7M 100 173.7M   0      0 28.74M      0   00:06   00:06         29.24M
100 173.7M 100 173.7M   0      0 28.74M      0   00:06   00:06         29.24M
100 173.7M 100 173.7M   0      0 28.74M      0   00:06   00:06         29.24M
unpacking source archive /nix/var/nix/builds/nix-71377-625775988/download.tar.gz