these 3 derivations will be built:
  /nix/store/8zz1wwmscrsbipzc14iclvakhyb05mii-source.drv
  /nix/store/g025q3g4x5bxjpsfqnl117391d1f33if-collie-1.20.0.drv
  /nix/store/r871zs8j1pvva0x74218vgn4i41lra21-check-collie.drv