these 4 derivations will be built:
  /nix/store/bpvrb9ny5hpaq8q7p1zll2m9g4gzp563-Cargo.toml.drv
  /nix/store/ma77n308y4x5197sir524hnm5dskm5ba-source.drv
  /nix/store/g9lmnqfp122wif71wr5sqkdkqqz74qb9-tribuchet-deps-0.1.0.drv
  /nix/store/m72adv28nsj5y0nld7hgzn1zbmzsq0x7-tribuchet-0.1.0.drv