It is somewhat supported at the moment, but it's experimental and we may remove the support for it. Reflection always carries an overhead in terms of binary size and as a result many of us feel that it's inappropriate for a low-level systems language like Rust.
In theory, given the attribute, and macro system, it should be possible to implement this as a library in the language, correct? I think that is vastly preferred over a constant runtime always hanging around.
