these 3 derivations will be built:
  /nix/store/aas9710bb7ndn18y64fhr35x1zh5ms72-source.drv
  /nix/store/fcnzrc0gwza9avxpa09pp33f6ib3405a-collie-1.24.3.drv
  /nix/store/brb2snfgdcainjxhsxcm180j532az6pv-check-collie.drv