these 4 derivations will be built:
  /nix/store/bwb3vwa437lhs6k83f7ja5lpzm4gyxgk-source.drv
  /nix/store/ji2yryg14wl625dda4c500fmzz3a7mh7-vendor-cargo-deps.drv
  /nix/store/1h38csqgf59dcd83h9lw77cbv3i126gy-tribuchet-deps-0.1.0.drv
  /nix/store/6ac6v6wgqbm69q55b7i8242qxkgblvp4-tribuchet-0.1.0.drv