FYI, if you care as much about compilation speed as your post suggests, today's Rust is right out: rustc is considerably slower than C++ compilers for typical workloads in large part because it doesn't have proper incremental rebuilds. That could change in a matter of months, which I'm looking forward to, but it still probably won't be at C level.* And without optimizations, rustc produces considerably worse object code than even C++.

* I could be pleasantly surprised, though. In theory, for incremental builds, based on the general design planned [1], rustc should be able to do better even than C in a lot of cases because only changed functions need to be recompiled rather than entire files; but I'm a pessimist and expect there will be something to make it slow in practice. I could be wrong though.

[1] https://github.com/rust-lang/rfcs/blob/master/text/1298-incr...