these 2 derivations will be built:
  /nix/store/zz0qf6gqmkrrg3d5ckz5x4k8kvzsimkz-flake-inputs.drv
  /nix/store/dgyq2yqxc7g1vrqyaydc5sczx5zd5zl9-check-flake-inputs.drv