these 4 derivations will be built:
  /nix/store/q6lwzvmlm6s5i3nh6xrkh19psj4985ws-Cargo.toml.drv
  /nix/store/xpdimmps4lab8faic45bg2hmm4b57q35-source.drv
  /nix/store/4ggxa829xplms13qkhjsdgnm50i0mv76-harmonia-deps-3.3.0.drv
  /nix/store/n2dqh4difnjqx86zim2zrkm684058fly-harmonia-3.3.0.drv