these 2 derivations will be built:
  /nix/store/zzdkabk062cf66ahvdj7r2qysqarkki6-devshell-dir.drv
  /nix/store/2pba6h7y3spwysw2kjz42x5iq7y3zvns-devshell.drv
this path will be fetched (222.2 MiB download, 634.8 MiB unpacked):
  /nix/store/2x1b3jkwhkg52xa5bnqrc7n04vz23n3b-dart-3.13.0