these 4 derivations will be built:
  /nix/store/493355v1wc0kxkfp56hv64j41d3x8cnr-vendor-registry.drv
  /nix/store/i77jl5m3pyqd828grrg674831p0qbzz5-vendor-cargo-deps.drv
  /nix/store/lssl3g95zrr6d3rk08w5s71sb61waxc3-harmonia-deps-3.2.0.drv
  /nix/store/0mhvjwlgi1shp2bis5wdjaz3ig33vj3y-harmonia-llvm-cov-3.2.0.drv