this derivation will be built:
  /nix/store/a62k373ga9y1w0s8938jr5gfsgc7khns-inputDerivation-effect-update-packages.drv
this path will be fetched (6.7 KiB download, 91.6 KiB unpacked):
  /nix/store/0gqhqw675b1d61vi49yc3blcvhms1dv5-nix-2.34.8-dev
copying path '/nix/store/0gqhqw675b1d61vi49yc3blcvhms1dv5-nix-2.34.8-dev' from 'https://cache.nixos.org'...
building '/nix/store/a62k373ga9y1w0s8938jr5gfsgc7khns-inputDerivation-effect-update-packages.drv'...