these 5 derivations will be built:
  /nix/store/mwb5dxwc4bcninax4x902w9vs1kbszrv-vendor-registry.drv
  /nix/store/s9di7fnfw8r0vgmbj9mr6x7s4ky7dxx2-vendor-cargo-deps.drv
  /nix/store/j119rkq1la8134di4z7syihhaza25yhb-source.drv
  /nix/store/zginhmm5dczz1mgba43in47x9581vmqb-harmonia-deps-3.1.0.drv
  /nix/store/fl2q80kjhcj7v83sl2ka12c5zw1zm62p-harmonia-llvm-cov-3.1.0.drv