these 2 derivations will be built:
  /nix/store/4m4ddb0cn8mzp386hw9b2za1n2z1rnk2-flake-update.json.drv
  /nix/store/0wb6b7fn1khziaalcwihr6r4qckrb38g-inputDerivation-flake-update.drv
building '/nix/store/4m4ddb0cn8mzp386hw9b2za1n2z1rnk2-flake-update.json.drv'...
building '/nix/store/0wb6b7fn1khziaalcwihr6r4qckrb38g-inputDerivation-flake-update.drv'...