these 5 derivations will be built:
  /nix/store/3l8qqb8jixvryw7x52sha14wnjmqa87f-source.drv
  /nix/store/rwrwwi3fld888mp2d46v85kk6b5cc8nh-vendor-registry.drv
  /nix/store/mcdz3kjlkq150sqvm5kbhazvziipn2i0-vendor-cargo-deps.drv
  /nix/store/l9lwinc9av4g35q0wz43cxrnih5p5vbp-harmonia-deps-3.1.0.drv
  /nix/store/11vqm171sbjx0mav285fpk46ilbq93hv-harmonia-llvm-cov-3.1.0.drv