these 4 derivations will be built:
  /nix/store/pkm4gb4h81j3ni2i1shha0ih0q18b3pg-Cargo.toml.drv
  /nix/store/v61wfk3nqi9kni4cddkf4rfj6zxpg862-source.drv
  /nix/store/y0qgc1cs45pvshx5h70zw5hgvqwdxh5b-harmonia-deps-3.2.0.drv
  /nix/store/r0b6zbgypjb4m0cp1xxrsxfplz1j246q-harmonia-3.2.0.drv