these 6 derivations will be built:
  /nix/store/0mcapv58ixmk1q8yrxl10v7jrqr6g0p8-cargo-package-serde_json-1.0.154.drv
  /nix/store/5kwnma73zaarlgcmb5j5sms87795rkm9-vendor-registry.drv
  /nix/store/0yvqlkv2y1rbcl1rlybnbxpaz8zdjhj7-vendor-cargo-deps.drv
  /nix/store/fvidsdfjms0hlba8zh52wlsw88byvplq-source.drv
  /nix/store/g7cxhd5l9sva12nhpw4m070zv5v889vf-harmonia-deps-3.3.0.drv
  /nix/store/55iml79vxiczpds5gkcx2cp6480niabp-harmonia-llvm-cov-3.3.0.drv