these 3 derivations will be built:
  /nix/store/8wdb8kgmwq1rfa23drcl3szcfx4fiwyi-dsh-source.drv
  /nix/store/6wl7bxazifc4nw9m6klc44q3aqfnrdnl-dsh-0.2.1-rc.2.drv
  /nix/store/s28f5gsnkdrb2hjhxbgnc7w1fkivfmqi-check-dsh.drv