these 3 derivations will be built:
  /nix/store/20m4gk0xd1ymx6xclwlvrk3sphf31l8v-clan-cli-source.drv
  /nix/store/933fa88riwwwq4zvawy3a2v9737fyrzy-clan-cli.drv
  /nix/store/04bsa2q9yrg5fafn8pwzmb3lb5npgy72-nix-shell.drv