these 2 derivations will be built:
  /nix/store/x9h4s84nf64ayijnwk9khn6p9nlp9fzj-devshell-dir.drv
  /nix/store/9pmsv2hfw8wj6b2b46f9p6x0fv84icf5-devshell.drv
this path will be fetched (223.0 MiB download, 637.4 MiB unpacked):
  /nix/store/6xjz3m0xdrqsw0vw6c9vrd0diwnwwb44-dart-3.13.0