these 3 derivations will be built:
  /nix/store/74x0mr0yn2rfvrsz262sy30g7pjqlahs-dsh-source.drv
  /nix/store/wzfybbsj6whi62g9whd61rnyd1bj8pp4-dsh-0.2.0-rc.2.drv
  /nix/store/8avmylljdaj85nsapqlalhw2vfb4j78p-check-dsh.drv