these 3 derivations will be built:
  /nix/store/mfga8n896c57xq557d5p9w1ln3sr1wkp-treefmt.toml.drv
  /nix/store/frg94vm2nlj2gkrwcvj0x8zli1q9r5h0-treefmt.drv
  /nix/store/nn6v5zsd2hj23i888iqsiwbrrzp70njl-treefmt-check.drv
this path will be fetched (5.8 MiB download, 17.7 MiB unpacked):
  /nix/store/vd35s6l1w86g8z3wfygsdx0761kdxp7s-rumdl-0.2.55