Fun bit of history: it's a hard problem! Rust went through three different package managers in its history:

1. Cargo. But not the one you've heard of. A small Python script that pulled stuff off of GitHub.

2. Rustpkg. Felt like Go's tooling. https://doc.rust-lang.org/0.9/guide-rustpkg.html

3. Cargo, the one we still use today. https://mail.mozilla.org/pipermail/rust-dev/2014-March/00908... just over three years ago.