these 4 derivations will be built:
  /nix/store/141xmw4fpgy1vrh0xgdbszw6cn53sykj-Cargo.toml.drv
  /nix/store/239pg3s5dj6k54j1c6gwy47vmaa8hwv2-source.drv
  /nix/store/8jpc75fm1bsvd59ygjqlxw4197dggkkx-harmonia-deps-3.2.0.drv
  /nix/store/ic8f0r2ip2xhdlcsy7n0h9hfcpbw2w9k-harmonia-3.2.0.drv