these 3 derivations will be built:
  /nix/store/akraw01qyqxip2x6a80syc5wmcq8p39b-source.drv
  /nix/store/d083fyn7cl6dswwf9d8jqyndyg0p2797-harmonia-deps-3.2.0.drv
  /nix/store/6xvi5ikmrlzbbggypnc6jr1qghizjbhm-harmonia-llvm-cov-3.2.0.drv