This came up in the pull request about enabling cargo auditable in Nix by defaut.

There are two hurdles here:

1. cargo auditable calls cargo internally quite a lot. We need to make sure it doesn't recurse.
2. Some targets are currently not supported, notably WebAssembly, and cargo auditable will error out in this case. This is not an option for a drop-in replacement for cargo - we need to print a warning and keep going.