these 7 derivations will be built:
  /nix/store/2zmgg4rgs014r06xbffj8an1z345jiqx-Cargo.toml.drv
  /nix/store/abipfvd9hjc2578gdjny6nvf8g0ymmzi-Cargo.toml.drv
  /nix/store/l7hc74s12dwpkbf1s5g3yisrpa1qr4sy-Cargo.toml.drv
  /nix/store/pyb1dmw24awjfh5hnh2d70qg6rn5i8nf-Cargo.toml.drv
  /nix/store/y7d13qw6fikb8zmqsmwjwlllsxhsjk0r-source.drv
  /nix/store/dflqgvl2adhb3s1my74ckfv5k768ys90-herdr-eternal-deps-0.1.0.drv
  /nix/store/29gn7axs6yafxgx62w5i2c2bia8jzkwb-herdr-eternal-test-0.1.0.drv