these 3 derivations will be built:
  /nix/store/9624vjplwf2c1dr95sz0h9n41n750m6x-source.drv
  /nix/store/swfz2hsiaqfb73xzl1i4ksx1k26yillf-harmonia-deps-3.1.0.drv
  /nix/store/0ccg3vqgmvrpzsw3a9ki7j5yrkvjn1zl-harmonia-clippy-3.1.0.drv