structuredAttrs is enabled trying https://github.com/slopus/happy/archive/4beb3543cfdeb507be838016996f7a0f65cf7b49.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 12.50M 0 12.50M 0 0 10.33M 0 00:01 12.42M 100 31.00M 0 31.00M 0 0 14.01M 0 00:02 15.43M 100 55.05M 0 55.05M 0 0 17.13M 0 00:03 18.29M 100 78.51M 0 78.51M 0 0 18.62M 0 00:04 19.57M 100 105.2M 0 105.2M 0 0 20.16M 0 00:05 20.98M 100 119.2M 0 119.2M 0 0 20.74M 0 00:05 20.98M 100 119.2M 0 119.2M 0 0 20.74M 0 00:05 20.98M 100 119.2M 0 119.2M 0 0 20.74M 0 00:05 20.98M unpacking source archive /nix/var/nix/builds/nix-83444-1320966075/download.tar.gz