this derivation will be built:
  /nix/store/2av25iarpp6ldphqdz4w6fakl0n0sd2w-inputDerivation-effect-update-packages.drv
this path will be fetched (0.0 KiB download, 91.6 KiB unpacked):
  /nix/store/js79frrf08h650h9xx8m4gch55fbk7dc-nix-2.34.8-dev
copying path '/nix/store/js79frrf08h650h9xx8m4gch55fbk7dc-nix-2.34.8-dev' from 'https://cache.sjanglab.org'...
building '/nix/store/2av25iarpp6ldphqdz4w6fakl0n0sd2w-inputDerivation-effect-update-packages.drv'...