I've found rust to be very capable as well, if lacking in runtime libraries with native bindings. It's not too difficult to bind into coreaudio and jack, though.
I've actually been doing a bit of research into using Rust for an upcoming project. The JUCE library is just so fully featured that it would be an undue burden to use any other language to write audio software in. Still, I think Rust is an attractive language for this space and there's definitely some talk about expanding libraries for a JUCE alternative.
