Rust actually has a really nice embedded library story, and I've already seen a few things in Ruby or Go that have started using Rust libraries for performance.

Rust actually has a really nice embedded library story, and I've already seen a few things in Ruby or Go that have started using Rust libraries for performance. https://github.com/BurntSushi/rure-go https://github.com/BurntSushi/rure-go for example, just to pick something that's crossed my feeds recently. Not sure about Swift, I haven't really been paying attention in that space.