these 5 derivations will be built:
  /nix/store/5dm4frpf528mynr9wwfv0jp8pxzhnlqd-vendor-registry.drv
  /nix/store/d1hljbcimdlk69qrj9ln3wwmhq85aixs-vendor-cargo-deps.drv
  /nix/store/2l3n2pc54va810fmq104fv6ll2rd92c0-source.drv
  /nix/store/wva8f8pk1vf9ral2cqp8p9c8ghmjpw1q-harmonia-deps-3.3.0.drv
  /nix/store/0nklyrcjx3w96bp66vhsb8hi0ld5cdl1-harmonia-llvm-cov-3.3.0.drv