these 3 derivations will be built:
  /nix/store/wnczg4df76sq64indmanam8kkxv0xd21-clan-cli-source.drv
  /nix/store/k745wbi8cpmq0s305rghbccjn9dp0sp1-clan-cli.drv
  /nix/store/pvlzhqkly6mqwxkm7gbc6jf15lhmcy5x-nix-shell.drv