these 2 derivations will be built:
  /nix/store/2pa2yzy41m2yzfyp60fzpd82fw4vl3pn-treefmt.drv
  /nix/store/amf6nvk0nai6wz4mvbmplhqrg0pqnnv5-treefmt-check.drv
this path will be fetched (3.4 MiB download, 9.0 MiB unpacked):
  /nix/store/6dinrg31jsnzrlmp9k1pzra5x2087qgz-treefmt-2.6.0