Personally I find D a much more comfortable option. I tried Rust a few times, and it contains a few nice features ('match', expressional if-else, built-in tuples/multiple return) which would be cool to see in something like D, but I found the overt emphasis in Rust on safety to be entirely too aggravating to work with. Perhaps I might try it again in the future, though, who knows.

To any Rust pros here, I'm curious: how long did it take for you to really get to grips with the language, coming from say, a C/C++ background?