these 4 derivations will be built:
  /nix/store/p0qvacc92pz3930k6cycgbap0kc8zh3q-Cargo.toml.drv
  /nix/store/gjx2b72njlxy1n3ffbyx4lx7wikr26w5-source.drv
  /nix/store/d0yah0mn1wh1q63jpj80p1gj5xz1ik71-harmonia-deps-3.3.0.drv
  /nix/store/vv7rxwm93ah90fa2yaaf48j1gm135pgi-harmonia-3.3.0.drv