these 3 derivations will be built:
  /nix/store/0g2lq734cxrrgsqxsdlmnh75b3qyyw9p-hol_guard-3.38.0.tar.gz.drv
  /nix/store/rds4q8hinn2qr1fv4xp5nq7fhx2ikmb1-hol-guard-3.38.0.drv
  /nix/store/3aqjwnspriik75xlhf55mm5nvqlrl040-check-hol-guard.drv