these 2 derivations will be built:
  /nix/store/9lcmmi377ai6fnvzd6h15jww1554lsx3-happy-coder-1.2.6.drv
  /nix/store/bha6iqm73ygr8wv9mra77219ajzxkwqx-check-happy-coder.drv
this path will be fetched (8.3 MiB download, 86.9 MiB unpacked):
  /nix/store/a8gip4nvz4kkms8rmnmf6qsmi7wnbap5-difftastic-0.72.0