these 3 derivations will be built:
  /nix/store/lgrppgxlnx12xl4093simhmjx3dzyb8h-source.drv
  /nix/store/3vsiphrsy1ygdj9d8dliy5ksl099fvk3-collie-1.20.0.drv
  /nix/store/m16y27ilwqwprsnxrg6bgfqcx4bl279h-check-collie.drv