these 3 derivations will be built:
  /nix/store/iah4dhdq2shxf1l1003lrs5q7jl293x7-hol_guard-3.13.1.tar.gz.drv
  /nix/store/s7mw9lrwbhka4g6d33l42xbbbx71yk1h-hol-guard-3.13.1.drv
  /nix/store/3y2d1msamr5r6d5si22nfav29hzhqdpl-check-hol-guard.drv