This could be a problem with my system, but I currently get the following error when trying to build the index:
[mcgibbon@pn50:~/nixcfg]$ nix-index
+ querying available packages
error: querying available packages failed
caused by: nix-env failed with error: nix-env failed with exit code 1:
error: anonymous function at /nix/store/1d5x84zdwsgl7223b3b66f00dr5s4w1n-source/builders/benchmark.nix:1:1 called without required argument 'test', at /nix/store/k5phkzb8m1rz22nqn8jdviw7ldj3mx2y-nixos-20.09.1870.14cf906f33c/nixos/lib/customisation.nix:69:16
This could be a problem with my system, but I currently get the following error when trying to build the index: