these 5 derivations will be built:
  /nix/store/afbrc98x28kfpcvfxbm4k8xj59qfkp06-Cargo.toml.drv
  /nix/store/qd2sipp62gln0mp03vajwlqw14dlws6q-Cargo.toml.drv
  /nix/store/xj1dfyik6h2f6ckmxpww0mzvg5rnh4mw-source.drv
  /nix/store/bcmm12y7r5gmx5jlvcaklzrqmh3bamlp-harmonia-deps-3.2.0.drv
  /nix/store/j62xz5jbaxyz9zslwvdlx73mxk70ac0m-harmonia-3.2.0.drv