these 3 derivations will be built:
  /nix/store/jszjx6sz073y49aai01vfn3v30k31nkx-dsh-source.drv
  /nix/store/5c5x6jgb52xnicp42xx60za69lmfmy3z-dsh-0.2.1-rc.3.drv
  /nix/store/aksrjml2n0s4dafb400x48r4dyw6ajgi-check-dsh.drv