these 3 derivations will be built:
  /nix/store/hwblk448jl33xh9srg1qh914z6hj578h-treefmt.toml.drv
  /nix/store/qnd0275xpn8qzlrcza00flj0hhnx0shj-treefmt.drv
  /nix/store/yl0q69i3kndwhhc86inkxzcz1xcdz97p-treefmt-check.drv