this derivation will be built:
  /nix/store/mfzymg26rynl1j1js7fqkzwdxz03w7q7-nix-shell.drv
this path will be fetched (2.1 MiB download, 5.5 MiB unpacked):
  /nix/store/byn68yph58ab2fa3jbbp014nigxmqsap-just-1.58.0