these 4 derivations will be built:
  /nix/store/1k94af1zsn3gsqcjffclj1g77lk6nyyl-source.drv
  /nix/store/78m3y7hn1afpn1j5dbh2ylwhns8fdhwg-unreal-agent-0.1.1-go-modules.drv
  /nix/store/3d8ir9fw3ns6y914ri57sf6cr1hi81yq-unreal-agent-0.1.1.drv
  /nix/store/say3sa5zng6n4dmkamijmdpz2x8acpfh-check-unreal-agent.drv