these 6 derivations will be built:
  /nix/store/d3fyl4qaw5s28kgc2g05s0kv6gc5ay1g-Cargo.toml.drv
  /nix/store/vmqsffxyazd38zfndjnr9ab5r3mwbaxm-Cargo.toml.drv
  /nix/store/z8sy56i0pmlrmf7kcdaqwxw0bri9k4qs-Cargo.toml.drv
  /nix/store/1zvnsn2z1mfaiqxvvfw38mras2vaksnn-source.drv
  /nix/store/dvi28sy9b4lk82as9h6qjwqy7vvjrqx3-harmonia-deps-3.2.0.drv
  /nix/store/fkiqy44in378xp6naf32vvsk8nj7bww3-harmonia-llvm-cov-3.2.0.drv