these 4 derivations will be built:
  /nix/store/wrl25skkgmg648qacr4x7745vzsz7mjb-Cargo.toml.drv
  /nix/store/7fm1hd1q4b1gbyffy60qvmxnjgxkfsc0-source.drv
  /nix/store/f1qshwacd8w8zbhjjb4w2hgni0xjwrm1-iets-deps-static-aarch64-unknown-linux-musl-0.2.0.drv
  /nix/store/ni8x9j6blj6c23hdjq7pzypbck67gxjw-iets-static-aarch64-unknown-linux-musl-0.2.0.drv