these 4 derivations will be built:
  /nix/store/mf7mci85idi41mssn4cp3hi5mppry7hx-Cargo.toml.drv
  /nix/store/8w0cx8c13h5bskaj0w30masb7a2pq0a1-source.drv
  /nix/store/zaqqdpzhgqm4spahq9h7149lx2vhl2mw-harmonia-deps-3.3.0.drv
  /nix/store/k58cd6s6hybw950vahw5k2xp0i32rp9m-harmonia-llvm-cov-3.3.0.drv