these 4 derivations will be built:
  /nix/store/wrbjsznq3as5wrx66yhqyfkyk137hcj0-Cargo.toml.drv
  /nix/store/d7bx2g0v5snf8q4ljibpnl3c22cmrdz2-source.drv
  /nix/store/zvhrjg59pa1xdhrjhvkhkdbvndyr9k3q-harmonia-deps-3.2.0.drv
  /nix/store/68ql0ihikr200y4ah9pxfvyhy07mrdls-harmonia-3.2.0.drv