these 2 derivations will be built:
  /nix/store/13n2vslfngfwc8zwl5j0jx2r3sil88wd-happy-coder-1.2.6.drv
  /nix/store/55rvmnndrasnhv62m3cr40iyhhhzfwyg-check-happy-coder.drv
this path will be fetched (8.4 MiB download, 86.0 MiB unpacked):
  /nix/store/harcsh4llmlv61iflk460c8k8n51rj3r-difftastic-0.72.0