these 2 derivations will be built:
  /nix/store/7vamgdrp0jrc66ks8p2q5n4k5nbk2z9k-cargo-vendor-dir.drv
  /nix/store/w1m5sanr8kwnq27wv19p5lr4kwz141c1-horae-tests-0.1.0.drv