these 5 derivations will be built:
  /nix/store/bnc66ir0icsrvbkmxvpy63a6ipl07isl-source.drv
  /nix/store/4vq63dr83ls234wk6r7bvr2zsz8mxyyr-vendor-registry.drv
  /nix/store/jnghhvxnxlfpr8c3k7jln9zagnjcy8qb-vendor-cargo-deps.drv
  /nix/store/4hi0cxvnsrxc4v29y3i524y1pagjj6aq-harmonia-deps-3.1.0.drv
  /nix/store/d804acmh7lbjgcbrw8r31q2dyvc4inv7-harmonia-llvm-cov-3.1.0.drv