these 4 derivations will be built:
  /nix/store/vh5wdwlxylsfm3d7nk2xp5iip69swq63-Cargo.toml.drv
  /nix/store/724yd82i943hz6dimdgdsimn2wwflzcy-source.drv
  /nix/store/i70b8sxp48ssnig4ikshivqzy2n3y0l3-harmonia-deps-3.2.0.drv
  /nix/store/vn1mga10g5ym6zg3ybza8xbhnsxypgic-harmonia-3.2.0.drv