these 7 derivations will be built:
  /nix/store/az4psyk0wxcri6c8pjvagh0nn65fs1m2-Cargo.toml.drv
  /nix/store/bc5pgjqqzh4b8kig7p02xwnr9vz01b5f-Cargo.toml.drv
  /nix/store/cjhl4n2ryi6fx6naq02ayrjak3a461gi-Cargo.toml.drv
  /nix/store/fwyk96bpxj5jr6m6ilsghfi8kwd1dl9z-Cargo.toml.drv
  /nix/store/2bvn8rfa4z7rbhjg3awiq28gn63q96dd-source.drv
  /nix/store/4pa5ybrsxm8qpk4azgsq1nwz4hp4jg0a-herdr-eternal-deps-0.1.0.drv
  /nix/store/y9fzphhcjm9d841hpmkg9bn4qy9f83rj-herdr-eternal-test-0.1.0.drv