these 2 derivations will be built:
  /nix/store/j6bjxnwr5x4pby6zb1jif4s3kcjxbkvk-happy-coder-1.2.5.drv
  /nix/store/psg210dcn6k6k8a8fql2fvphqj3i01hz-check-happy-coder.drv
this path will be fetched (9.7 MiB download, 113.1 MiB unpacked):
  /nix/store/p5wj4cikdbj70dxa4jn0zhsvlhpnnmzc-difftastic-0.71.0