these 4 derivations will be built:
  /nix/store/wd8yfva2b94f6rlfkzl68c8y338q3byh-source.drv
  /nix/store/z3klj0lsai63s0345zp9vdfy1d1hk8lp-unreal-agent-0.2.0-go-modules.drv
  /nix/store/9a1s0cnl5j3xy36zs52jxi75p34plyav-unreal-agent-0.2.0.drv
  /nix/store/kn9s3blwnq8iick0wdjg8rcdnwafg3hz-check-unreal-agent.drv