these 4 derivations will be built:
  /nix/store/ck5dfnyqaw2nxq05f1vrai6m12s2z1wq-Cargo.toml.drv
  /nix/store/5fwn9jhqdvhypakzk3s8q6avf5w77l0s-source.drv
  /nix/store/0b56c4512g0j5awc1swh5s94dvvbn757-iets-deps-static-aarch64-unknown-linux-musl-0.1.0.drv
  /nix/store/vm358n70x6hk5mck37ljbgq2h3xjv0yl-iets-static-aarch64-unknown-linux-musl-0.1.0.drv