these 3 derivations will be built:
  /nix/store/78lcgxhflfjb2346nljapqnk0dksqarq-dsh-source.drv
  /nix/store/dppcb1fvmhdsld95maph5nyyn39idfyr-dsh-0.2.2-rc.3.drv
  /nix/store/j20kw0jl7rdkrc5s688pnyv8vd4h2ph1-check-dsh.drv