structuredAttrs is enabled

trying https://github.com/MinishLab/semble/archive/refs/tags/v0.5.2.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
100  1.40M   0  1.40M   0      0  3.05M      0                              0
unpacking source archive /nix/var/nix/builds/nix-57353-1527697629/download.tar.gz