these 3 derivations will be built:
  /nix/store/8502qfhssba16gm2b1zflq17hsd3m967-treefmt.toml.drv
  /nix/store/myi8w65qb0nhl6qvv7py74s8jm2np654-treefmt.drv
  /nix/store/l6hcg91q5lgdrcscnvnfg3nvh4010fld-treefmt-check.drv