these 4 derivations will be built:
  /nix/store/snbzcijg7iwvjy25ipm3zh86qbsbrd0q-Cargo.toml.drv
  /nix/store/b3hnr8wasapsjmx1lszaivn5l2c67306-source.drv
  /nix/store/ryk2ds6gfa8kjdrphhiba8xym6vds3p2-iets-fuzz-diff-deps-0.0.0.drv
  /nix/store/4rvapds6x5ifpx3zp2707m0mqz9n849s-iets-fuzz-diff-0.0.0.drv