Took a look at both Rust and Go to hack on, but up until today I haven't found a usecase where I _need_ C-like performance (and choose to use Rust).

Even though Google/Fuchsia is using Go for it's networking[1], I wouldn't really consider Go to be a system language.

[1] https://groups.google.com/forum/#!topic/golang-dev/2xuYHcP0F...