these 4 derivations will be built:
  /nix/store/7cjnfs2dl1shpn0lqp920db2za5bz3pr-vendor-registry.drv
  /nix/store/jispsc8hdlmx6mfm068lshf0f9g0h878-vendor-cargo-deps.drv
  /nix/store/p3x7n2b3pvaazzyl9flx6mcbryayf2yr-harmonia-deps-3.3.0.drv
  /nix/store/26jahfl8z6r0hjmhhf156wi489nva161-harmonia-llvm-cov-3.3.0.drv