these 4 derivations will be built:
  /nix/store/wwlm2ijxn907w95p0ri5gdprv8ffwm2n-Cargo.toml.drv
  /nix/store/9wvkcpi2pnc9pbrrwaycdfvvcmqgxg0g-source.drv
  /nix/store/nj98gsssra5cjkm70b7idjgnis59241b-harmonia-deps-3.2.0.drv
  /nix/store/4d1l9474l6rchcgwqb06aq2asmwmngsw-harmonia-3.2.0.drv