these 5 derivations will be built:
  /nix/store/2zqgr6pfqyjd2qp5nj97idwv9xahrqrp-vendor-registry.drv
  /nix/store/1k231402p1z3q7y0xl05gb58kx2vj79f-vendor-cargo-deps.drv
  /nix/store/5sxfmav7xb3p8kjgndqa27dywjv0ii9m-source.drv
  /nix/store/9byfv0bgj33iyniqdy37yw7wqs1sqmv4-harmonia-deps-3.3.0.drv
  /nix/store/01lli0jq5fcpz2a5m9hfbsrb6fxdjw7b-harmonia-llvm-cov-3.3.0.drv