these 4 derivations will be built:
  /nix/store/g29cyf2xjas0ad47q9k81ccmibcfy5z7-Cargo.toml.drv
  /nix/store/fds6sx9wgchrsc3df0pcil3wmjxhd934-source.drv
  /nix/store/sbz0n8np9cpq3gv8zhlsvgn3q1sjbbs5-harmonia-deps-3.3.0.drv
  /nix/store/jzb0bdd67cgldbmlq89qjzaklcwa77l1-harmonia-clippy-3.3.0.drv