these 3 derivations will be built:
  /nix/store/6yh3way85qsx0ivhg9qm7gg8ivgvls75-source.drv
  /nix/store/z5cfg136dw1gwbys2dwrd99cfiyzmdx2-collie-1.15.3.drv
  /nix/store/9ph0azvqr8k5cwdf2lynzd9i7r2pjqn9-check-collie.drv