these 3 derivations will be built:
  /nix/store/4hggnax11l3y97z1l58yyqnmi753zzvn-libc-0.2.189.drv
  /nix/store/nd5b5sb0rlwyiqlgp1a1zfv8w1hrmvb6-cargo-vendor-dir.drv
  /nix/store/7xx6sqvjq5q0m82w5djzh9jkcgvdymxn-bob-0.1.0.drv