these 4 derivations will be built:
  /nix/store/cm53lic8izyv79zmjlryp3sia8z3zhv3-Cargo.toml.drv
  /nix/store/zxxp7cx2sy32507pr29x7a32a9bn6pnj-source.drv
  /nix/store/a7jb34111bgnb06nxmy7v43naj7kjiap-harmonia-deps-3.2.0.drv
  /nix/store/89yxp34b790c9bg5hl2b9ld7758y85zg-harmonia-3.2.0.drv