these 2 derivations will be built:
  /nix/store/i6g5mn144058clg0z08dxmzcxyj444v8-treefmt.drv
  /nix/store/7h1qmph1d3ilkj7w5h8snvsb69dlg24d-treefmt-check.drv
this path will be fetched (3.3 MiB download, 8.9 MiB unpacked):
  /nix/store/6rzc5bd7wrxgrdc17cckdsipvs1lzxwm-treefmt-2.6.0