In Rust you can have multiple versions of the same crate in your project. This let's you update you your dependencies almost whenever you want, even if their tr

In Rust you can have multiple versions of the same crate in your project. This let's you update you your dependencies almost whenever you want, even if their transitive dependencies require different versions of the same crate. You can't have multiple versions of the stdlib (the way that things are set up today). Some crates re-export typed from their dependencies, and to use those you have to match in the right crate version. This is an anti-pattern, but it happens.