I think most of people have heard about https://redox-os.org It is pretty modern micro-kernel OS written in Rust. I am not Rust fan, but if it solve some low-level task and allow to build on top of it more hight-level tools why not to use it?

Now it have port of GCC, Python and some other languages. Few days ago I wrote to Michael Aaron Murphy, man who did port of GCC and asked him about D. Here is his answer:

"I wouldn't count out Rust as being too low level, as it has a lot of high level abstractions, and crates to provide even higher level abstractions for more specific fields. That said, when Redox becomes self-hosting, it should be capable of running any software that depends on libc, D included"