these 5 derivations will be built:
  /nix/store/gpsgf2qhsprf4m0hhbwghca8swm8qzrc-Cargo.toml.drv
  /nix/store/sky0hg0sad2ig56vd2gxp23mxfd7vbsk-Cargo.toml.drv
  /nix/store/6vzwcfaj9frswia1b10qccs71jzpwd6f-source.drv
  /nix/store/wl4ghj2fl349b0v0iravya0bs9i2w2wn-herdr-eternal-deps-0.1.0.drv
  /nix/store/h4zslyrjf388zc2c0hv7sxk2cgcwzkck-herdr-eternal-0.1.0.drv