I actually have been learning Rust, and since I'm also interested in bare metal programming, I immediately looked into this project when it was on the #rustlang

I actually have been learning Rust, and since I'm also interested in bare metal programming, I immediately looked into this project when it was on the #rustlang tag on Twitter. Please let me know if you try to use it for your project, I'm eager to hear if it works for you. llvm is a fascinating project -- if you get it working on your STM32, you also may eventually be able to also use it on Arduino since an avr target for llvm is in the works.